C3 corvette heater core bypass. I do not need heat. Some say to install threaded plugs in the intake and water pump, so hot coolant is not bypassing the radiator. Aug 4, 2001 · I did notice that parts counters will tend to give you a generic Chevrolet core. Jan 23, 2018 · C5 General - Heater core bypass? - With the heat on I have been smelling antifreeze in the cabin. Would anyone happen to have pictures, or at least a detailed May 9, 2022 · C3 Tech/Performance - Bypassing the heater core on a 1980 - There have been a number of posts on the best way to bypass a heater core. Remove the seats to gain room. C8 Z06/ZR1/Zora Discussion; C3 Corvettes, 1968 Jan 31, 2012 · C3 Tech/Performance - Heater Core Bypass and Overheating - I have an '82 which had a leaking heater core. The manual with the engine states, "Any small block engine, regardless of year, that uses Vortec heads, will require an external coolant bypass line from the intake manifold to the 5/8 hose nipple on the water pump (passenger's side). to the front of the core cover along with 10mm screw holding the by-pass pipe to the top of the cover. On the way over I blew the heater core. Where do you find the plugs for the intake and water pump and in my 68,there is a small tank on the fender where hoses go. Mar 7, 2011 · C3 General - Heater Core Bypass Question - I just bought a 1974 L82 last weekend and learned of the heater core bypass solution to high interior heat issues since then. The 5/8" hose to the intake and the 3/4" hose to the top of the water pump. I just ran a single section of 5/8" silicone hose from the intake manifold to the heater core. So, can I bypass the core by just running a heater hose from the intake to the water pump? Should I use the 3/4 or 5/8 hose? Can I just get a plumbing adapter to make the transition from Lowes? Nov 16, 2012 · A/C, Auto, 4sp, SB, BB, all make a difference in the heater hose routing. Loop the hose from the water pump to the intake, or just plug off both ports, If looping is the best option, is there a molded hose for this? Remove screws (4 total) from under the gasket material on the duct. someone told me not to do this as it would cause a hot spot in the manifold. You will get absolutely brutalized in value with the heater core bypassed. Having said that, I do not believe that a 1/8" greater dimension on that rectangular hole will cause any problems. Redo the hoses so they come and go to the engine and radiator. It is likely under a grand for a shop to fix. Have new one coming but won't be able to install before the weekend. To solve the problem presented by Cliff, try eBay: Apr 27, 2019 · Blue73Shark. They're not the same diameter (5/8" and 3/4"), so that's a problem to deal with. Received 2 Likes on 2 Posts. I used a lever ball-**** brass valve from the plumbing aisle at H. Jun 13, 2003 · C3 Tech/Performance - Bypass the heater core??? - I discovered last night the the heater core has gone bad. Dont want to tear the dash apart if I dont have to thanks. 00 /each. ***. I cannot find a fitting that lets me connect 3/4 hose to 5/8 hose to bypass. C3 Tech/Performance - c3 heater not working - I recently bought a 1974 Corvette L82. the lines with the nipples still in them are just pushed off towards the right fender and tied to the AC lines comming from the condenser so thay can't go anywhere. C8 Corvette. Aug 6, 2011 · C3 Tech/Performance - Heater Core Bypass - Can anyone show me the best place to do a heater core bypass on a '73 L-48 w/AC? CorvetteForum - Chevrolet Corvette May 11, 2015 · Originally Posted by Cliff Harris. Cost: about $ 6 and 1 gallon of spilled coolant. As I understand the way GM has this thing plumbed, the coolant is always runinng through the heater core. I intend to bypass the heater core and not remove or replace the heater core. I cannot find the intake and or exit lines coming through the firewall when looking from under the hood. I will not get around to usually the original shut off was located between the heater core and the engine block. Mar 13, 2017 · Having said all of that we would often bypass our heater cores on our C3's in the summer to reduce the cockpit heat in the manner you suggested. Jan 29, 2005 · C4 Tech/Performance - heater core replacement - i have been reading the threads concerning heater core replacement, and i have neither the place or the time to do mine myself. This will keep some circulation avoiding stagnant water in the core. 25x6" chrome plated steel (sink) drain tube, and a . 05-19-2007, 07:58 PM. Mar 5, 2002 · Re: Cheaper, neater throttle body coolant bypass (Red 86 4+3) Quote: There I got a 1. Its about half as bad as people say. You can identify the screw location (5/16 heads) by looking at the other side of the flange and locate the screw holes. I know some folks have discussed the bypassing of the heater core, but I glanced around and did not find one specif Aug 12, 2012 · C3 Tech/Performance - AC work with heater core bypassed? - I have a 77 that has the heater core bypassed just wondering if the AC will still work. Suggestions welcome. I want to run hoses and not plugs. From what i understand it is quite expensive to replace it. Replacing the Jul 9, 2018 · In these articles, Vette will show how to replace the C3 heater core and the evaporator, two items of core value in controlling your car's interior environment. Your Price: water pump bypass 427/454 engines Sep 18, 2016 · C5 General - How to bypass the C5 Heater Core? - I've spent at least a week searching for a good thread containing good information on how to bypass a heater core in the C5. Corvette C3 heater box. #3 · Feb 22, 2022. I believe that I checked with at least 3 or 4 dealerships. was going to plug heater hose outlet on water pump and also inlet on intake manifold. I haven't found a single thread worth reading that actually tells one how to do it. gm #: 14091278. 1968-82 Corvette heater box allows you to remove defective air conditioning units Sep 19, 2009 · C3 of Year Finalist (appearance mods) 2019. Or any other seals that are missing or cracked. Coolant is leaking from the A/C box in the engine compartment. I deleted all the AC stuff and need to get a cover and blower, but wont do that for a while. Likes: 1. However, some guys tend to do May 19, 2007 · Like Corvette Kid said, Do NOT by-pass the surge tank!!!! Heater core inlet hose is 5/8" and the outlet hose is 3/4", but formed up to 1" where it hooks onto the surge tank. It comes out the defrost,. The plugs or 5/8 3/4 connector are available at auto parts stores. with 95k on my 94 coupe, i think it is near overdue. Can I hook up the hose from manifold to water pump to bypass core and keep it that way over the summer w/o drivability problems and w/o concerns of overheating? Nov 24, 2004 · C3 Tech/Performance - heater bypass or plug it up??? - heater core rotted out. pn: 738016 . I’m on South Texas so it only gets cold here 3-4 days a year. The procedures are pretty well explained. Jun 30, 2013 · C3 Tech/Performance - 2005 GTO heater core bypass valve, vaccum needed to shut off heat in cabin. WONDERFUL. Feb 22, 2022 · 14 posts · Joined 2022. Tried NAPA, Home Depot, etc. Silver 1974 Convertible - L82 4 speed Low miles (was only 8,900 when I bought it in March 2006) - Now 54K miles. I know some folks have discussed the bypassing of the heater core, but I glanced around and did not find one specif May 17, 2021 · Blocking off the water flow to the heater core for long periods of time will cause corrosion and eventual leaks. See video in sticky section. Reassemble in reverse order. $57. It is also completely unnecessary. Thanks :cheers: David Dec 9, 2008 · C3 Tech/Performance - Bypass the heater core? - Should i do it because my 78 gets hot as heck on your feet. Add to cart. Heater Hose Bypass 2009 C6. Thanks, Jim Feb 4, 2005 · C3 Tech/Performance - Can I bypass the heater core? - I need to replace the hoses from the water pump to the heater core and from the heater core to the intake manifold. I haven't Jun 15, 2009 · So, what is the best way to disable the water pump heater connection ? Should I use blockoff caps on intake manifold and water pump or is it better to bypass the heater core with a simple hose between manifold and pump, like a loop ? Is there any risk to block off completely the water pump heater outlet, like pump cavitation ? Sep 2, 2008 · C3 General - Heater Core Leak Symptom - I think I have a leak from the heater core on my 1980 C-3. Part # 242151. When they switched the dash in 78 it became a little more difficult. I made it about a mile down the road and what looked like smoke, started pouring in through the vents. It will look like this. Early C4's are notorious for this specific problem. Received 535 Likes on 452 Posts. I did the Bypass right at the heater core to Keep the original look in the engine bay and it is easy to convert back to stock Jul 25, 2017 · Posts: 80. it kinda looks like a crooked letter "P" with one hose going in and another going out, with a small vacuum line somewhere in the middle. Do I need to run a short hose from the water pump outlet to the inlet on the intake manifold to bypass the heater core, or Jun 13, 2002 · C3 Tech/Performance - Heater Core Bypass pics?? - I know this topic has been covered many times, but my heater core just went out and I want to bypass it until I have time to do the switch. Aug 23, 2013 · I see how the bypass works on your later C3's. My boys and I are working with a 74 with the 350 J motor. The increased heat the radiator will see is from the water that was not cooling in the heater core. I took my non-A/C, '73 to Hawaii for three years and bypassed the heater core the entire time I was there just to remove some cockpit heat. Block w/ plugs the intake & water pump connections. My plan is to either drill a small in the valve ball or crack the valve open. said i should Buy 1968-1982 Corvette Heater Hose Kits online at Zip. To repair your original valve, you use only the core of the 74800 to replace the core of the original valve, usually because the original valve is leaking at the seal of the actuating shaft, which is part of the core. Since I have the engine out and everything out of the way I wanted to remove the extra hoses for the heater out of the engine bay. Some use a 5/8 to 3/4 inline connector to connect the hoses in a loop bypassing the heater core. Back in the olden times, before HVAC with hot and cold decks, temps in the heater core were controlled by a valve in the hose leading from the thermostat to the heater core. Would it be a good idea to just take off the 3/5 Nov 27, 2014 · In this video I show you the step by step on how to replace a heater core in a C3 corvette. I got quotes up to $2,300. Corvette C3 heater core. Any auto part store can help you. 2008 Jetstream Blue Convertible. Carefully remove dashboard and then you are almost there. 80. Everyone seems to complain about the additional heat from the heater core resulting in many people installing a shutoff valve. Aug 24, 2010 · C4 Tech/Performance - Heater core bypass problem - Heater core went. now remove the 10mm nut holding the div. So basically after the bypass I have nothing to run to the reservoir except the overflow tube from Aug 5, 2018 · Part 2 details the replacement of the evaporator, which some Corvette owners—particularly those of us in southern states—may argue is more important than the heater core. Temporarily. 58 posts · Joined 2005. For the life of me I can not find it on my car. Apr 6, 2012 · After reading in the FSM that I would have to tear the dash out to replace a $20 heater core, I decided to see what kind of deal I could get at a local Chevy dealer. Since its now summer in Florida, and you can cook a prime rib in the passenger compartment of my Vette after Aug 8, 2004 · then remove two bolts to remove clip from tube side of heater core. Certainly, the topic of heat inside a C3 has been discussed a number of times. The dashboard is probably the most critical thing, be careful, they can be fragile with old age. Others claim you need to have the coolant continue to circulate, and to Sep 29, 2009 · C4 Tech/Performance - Heater Core!! AWESOME. To my surprise nothing happens. There is a short hose that runs from Jul 28, 2012 · C4 General Discussion - Bypass heater core in 93 vette - I'm looking to bypass the heater core in my 93 vette until I get a chance to replace the core. I hop in it this morning and attempt to turn on the defrosters. 1985-1987 Water Shut-Off Valve Outlet to Water Pump & Oil Cooler Line Coolant Heater Hose (KC4 option) pn: 136338. (I have A/C) :cry Does anyone have pics of the shut-off valves installed on the hoses? I think I might be imagining a much more May 3, 2009 · C4 Tech/Performance - Heater Core Bypass help - Hey everyone, My heater core is beginning to fail, so until I can fix it later this summer I was going to bypass it since I would not need heat til the winter. - I have a new GTO heater core bypass valve that I want to install in the Vette but found that I need vaccum for it to be in the bypass mode. . So i read that you can disconnect two lines when they go through the firewall you can connect them together Dec 18, 2018 · I connected the two heater hoses that go in and out of the core with a brass Fitting that has the correct Diameter for each heater hose and covered the in/out brass tubes of the heater core with rubber caps. I realized it could have been 1 of 3 issues, 1) heater core 2) plugged A/C drain or 3) evaporator. Oct 1, 2009 · You might be able to "Band-Aid" a fix temporarily; but a 'permanent' solution is not likely to be found with a piece-meal repair effort. Is there any way to make sure it is the core actually leaking without removing the A/C box? Corvette Coolant / Heater Hoses & Lines coolant control valve to heater core. Feb 5, 2014 · C3 General - Heater Core block off or bypass - As I drive there is radiant heat that blows into the car from the heater core. Don't see any fluid on the passenger side floor. [IMG] [/IMG] Go to the inside of the car and remove both seats,side covers,glove box, vent tube under glove box that is connected with one wing nut, center console and gauge cluster. In the late fall and winter we would reconnect them. The amount of heat transferred from your hose to the heater core and then to the cabin is negligible when coolant flow is shutoff. lol sometimes I wish it was about 0 degrees out because it so hot. Oct 27, 2005 · 75Bill. Motor will be running a Aug 6, 2019 · As someone who replaced the heater core, just fix it. We've redone the brakes, and now it's time to do some motor work. I just added a shut-off valve to the hose inlet to the heater core (from the water pump). Well, not really, but it IS a PITA. Or a degree or two of retarded timing. when i decide to fix the heater core, the lines can simply be reattached. You can put off forever. I too have a stewart water pump and a shaw\stewart 160 Jul 14, 2014 · C3 Tech/Performance - ByPass Heater Core - Hi Everyone, I Just installed my new motor and decided to bypass the heater core. I know some folks have discussed the bypassing of the heater core, but I glanced around and did not find one specif Used to loop the heater hose outlets of your LS/LT engine water pump. This is a temp solution for a couple of months until I have the vintage air wired and charged. Oct 17, 2011 · C5 Tech - Heater core bypass - Was out picking up a part for my wife's car yesterday afternoon and once I arrived home and was pulling into the garage, smoke started coming in from all the vents. However, I still have a small run of coolant coming out of one of the pipes Jun 3, 2005 · C3 Tech/Performance - Heater core bypass - What size fittings do I need to bypass the heater core? Iwant to plug it at the water pump and also at the intake. Even with 2 shutoff valves, one on each hose, heat transfers to the heater core, but not enough to make a real world difference. Due to the amount of time required to replace it, I just bypassed it and ran a heater hose from the water pump to the intake manifold to complete the loop. 5x3" steel pipe nipple. Yes, to replace the heater core in a 1980 Vette requires disassembly of most of the dash. Or if youre taking it into the shop, have them fix it. pull over, and see a slow line of antifreeze leaking from the passenger side where the heater core would be. Might be a good time to install shut off valves as I did to keep the heat out of the cabin in the summer. Original owner bought it as an investment for son's college expenses. You can by-pass the heater core ONLY and will have to make an adapter due to the different sizes. Anyway, I decided to take the Corvette out for a ride. Where should it be located? If I can not find it, can I disconnect and splice the two lines together going to the heater core from the underside Jan 12, 2005 · C4 Tech/Performance - Heater core bypass - Hello all, My question is in regards to an 84 w/ auto. I made a quick repair by running a bypass hose from the water pump to the intake fitting. The pump pulls water from the block and heater core (when flowing) and then pushes it thru the radiator. Bullet Point 5. This is the red hose pictured. Reply Like. I just would like to know if i did it correclty :) Dec 27, 2008 · Replacing the heater core is fairly difficult, not impossible. No, I had two hoses. My Corvette has a heater hose mounted shut off valve (like most other C3's). Bill. If I run a small hose from the Mar 5, 2015 · Take the expansion tank off. Same day shipping. Lower the steering column, don't need to completely remove. More uncomfortable than hard. The infamous green coolant on the Jan 15, 2007 · C3 Tech/Performance - Heater Core Leaking 82 Bypass? - I have been told that the 82 has a bypass valve for the heater core. The usual method is to disconnect and remove the two hoses that go to the heater core and connect the ends of the heater core bypass pipes together. #13 · Dec 29, 2005 (Edited) The larger hose goes to the waterpump and attaches to the larger pipe on the heater core. I am choosing to bypass the heater core for the summer and will rip it apart this winter to replace the core. Our Heater Boxes, Cores, & Seals for 1968-1982 C3 Corvettes are made of high quality materials and built to last. Corvette C3 blower motor. Aug 6, 2011 · C3 Tech/Performance - Heater Core Bypass - Can anyone show me the best place to do a heater core bypass on a '73 L-48 w/AC? I saw a few threads when I did a search, but nothing definitive. driving along today, and all of a sudden mist comes out of the defroster, smelled like antifreeze. Drain the heater core before you put it back together. Used with vehicles that are no longer using the heater core. Back to the 1970s! So this morning time for a cruise :) to test things out. 00. Use a screw-driver (or 2) to work the hoses loose then pull the Jun 8, 2008 · C3 Tech/Performance - C3 with A/C Heater Core Leak-Sometimes You Just Wish to Puke - I was proud as punch with my 1970s retro tune-up in the last few days. Aug 1, 2022 · The heat from the engine compartment transferring through the (stationary) coolant in the heater hoses is likely less than from crumbling or missing seals around the heater core inlets at the firewall. (With AC) May 2, 2022 · C3 Tech/Performance - Heater core bypass - Hello everyone, as i mentioned in the title i have done a heater core bypass because my heater core was leaking inside the car. Feb 8, 2017 · C4 Tech/Performance - Bypass Heater Core - Can someone here please help me? I just bought my first C4 today and I am trying to bypass the heater core, as I know it is in need of replacement. Jul 7, 2023 · Received 54 Likes on 35 Posts. Jun 30, 2011 · Of course this is unreasonable to do. Includes 1 black rubber hose. Dec 22, 2017 · C3 General - Bypassing The Heater Core - Last month we had a couple really nice days and the snow hadn't fallen yet, so the roads were salt free. Bullet Point 4. . I bought the 3/4 to 5/8 piece to connect the hoses. I was told the bypass hose helps in circulating water in the block, but once the stat is open the cooled water from the pump goes right into the intake and back to the radiator, so that cooled water never sees the motor. I went with the lowest quote which was $750. Now, the engine is running 60 degrees hotter than it was Certainly, the topic of heat inside a C3 has been discussed a number of times. I don't trust my Jun 27, 2022 · C3 General - Heater core by-pass - Looking for opinions on what to do with hose routing. Complete Corvette You can reuse your heater core if it is still working properly. Or your catalytic converter. Loading. If you are just putting this cover in place on a non air conditioning Corvette you must purchase a air conditioning Corvette heater core P/N 26247 for 1968-77 and P/N 26249 for 1978-82. Specializing in C3 Chevrolet Corvette Parts since 1977. Can anyone tell me if it'll be ok to bypass the heater core and still use the car without a problem? I've been planning a road trip and if I tear it apart now it won't be ready in time. 551699. Bullet Point 3. 02. Remove back cover of duct. D. I live in Florida. First, remove the left taillight. sbc one in water pump, one to intake. Compatible with all LS or LT series engines from 1998 and newer. Rather than just bypassing the heater core, which essentially "short circuits" part of the cooling system, simply plug off the lines heading to and from the heater core. This should not take more than 30 minutes. 1985-1987 Water Shut-Off Valve to Throttle Body Inlet Heater Hose. , the kind with barbed hose fittings, and used stout clamps on both sides. Jul 21, 2007 · C3 Tech/Performance - *Heater Core Leak - HELP!* - How do I bypass the heater core? Can I coneect the hoses together with a coupler that's 5/8 on one end and 3/4 on Jan 18, 2005 · C3 Tech/Performance - Instead of bypassing the heater core, can i just plug the intake and water pump? - Instead of bypassing the heater core, can I just plug the intake and water pump? Would this effect anything? Would rather not have that hose under the hood if i can help it. You really need a service manual for the 79. Especially if you live in a warm climate or only drive in warm months. My question is this. was not one of GM's best designs, and typically they stopped working and were usually taken off or replaced with a gate valve of some sorts or some of us would just Jul 28, 2014 · LSx Swap Water Pump Question. Out of Production: $98. Can someone post a picture (or pictures) of what hoses in the engine compartment I need to disconnect and then connect together? Jun 28, 2023 · C3 General - Heater core bypass - Can I just cap off heater core,I think I have a leaking heater core,or did at some point,I don’t have the hoses hooked up to manifold,because fuel line is in the way of hose,so when I did new heads,intake,carburetor replacement,I never did hook either of the hoses back,so don’t have Jun 14, 2007 · my heater is bypassed at the moment with the plugs. The heater is not used and the AC has been removed for a few years. 65-82 Hose Clamp Assortment - Polished Stainless Steel. I'm replacing the water pump and alternator, more to be proactive than recognizing any problems. Manufacturer Part Number. I quickly checked the Jun 28, 2009 · I just did this Carefully loosen the hose clamps at the diverter valve assembly (to the 2 3-4"hoses going into the firewall). Heater Core Bypass (1/23)6/6/09 10:58pm. - This is wonderful. Did some research on the LS water pump, and from my understanding, the heater inlet and outlet ports cant be plugged or restricted, as it's the heater core return hose that causes the thermostat to open. C3 Tech/Performance - Heater Core bypass - Hi, Guys, I would like to bypass my heater core in my 1978 L48 w/AC. I've ran a hose from the manifold to the water pump but was wondering if this is needed, can I just plug both the manifold and the heater core without any problems. I put them where the T's were, re-using the OE hose clamps. Want to use car. The coolant bypass mod is extremely simple as many have reported. I know some folks have discussed the bypassing of the heater core, but I glanced around and did not find one specif S1E7 heater box , Corvette C3 blend doors , heater core . You are absolutely correct: measure the new unit very carefully as even a 1/8" difference can cause some misery. Would it be a good idea to just take off the 3/5 Aug 4, 2022 · C3 Tech/Performance - Heater Core bypass - Hi, Guys, I would like to bypass my heater core in my 1978 L48 w/AC. But strongly suspect the heater core is leaking. It isnt THAT bad. The hose ends are a strange size so you will need an adapter or two and hose clamps. So, for the summer, what is a better plug for the pump and manifold? The Apr 21, 2022 · I would like to confirm that on the 1989 both ends of the heater hose that go from the intake manifold to the heater core are indeed 5/8" internal diameter. It's not leaking, only when I'm moving. Little help Please Thanks Mar 7, 2022 · Installing a loop will not bypass the radiator. just called the local chevy dealer here in marysville wash and their quote was $617 parts Nov 14, 2009 · C3 Tech/Performance - Another Heater Bypass Question - Read through a bunch of posts on this topic but not sure about the final hose routing for a smallblock. The Four Seasons 74800 valve is quite different than the stock '87 valve. As well as once the dash comes apart it might never be as solid May 3, 2004 · C3 Tech/Performance - Heater core blew! Can I plug the intake and water pump or run a bypass hose? - We just returned from a beautiful trip to the Oregon coast. Part 1 details the steps and May 10, 2003 · I plugged mine on my BB, since then the engine definately runs cooler. Is there a way I can get vaccum from the heater controls in the off position to Mar 22, 2006 · C4 Tech/Performance - Heater core bypass - Hi all, Need to change heater core and also locate a heater valve (missing) for my 84'. I think you will be gladly accept the tradeoff!! Jan 21, 2011 · C3 Tech/Performance - Heater Core Bypass - Good Day Folks, New to the forum and new to the sport. Got about 10 miles down the road and there it was. Do I put anything on the threads? thanx :) May 13, 2012 · C3 Tech/Performance - Heater Core Bypass - one plug better than another??? - Had the antifreeze leaking out the heat duct in the cabin. May 12, 2003 · HEATER ON ALWAYS ? I've got a 69 BB convetible w/o A/C. The tank hoses have been 'looped' as the hoses are off the heater core ends. Is there a valve or something I can splice into a heater hose to prevent the hot water to circulate? Is there another way? Mar 23, 2015 · This engine uses Vortec cylinder heads. Suggested routing is from the 3/8 NPSF boss on the intake manifold to Feb 16, 2019 · C3 General - Heater Core Bypass Needed? - Hello, I do not have a heater core in my car at the moment. Only difference between heater on or off is the openning of the air door. Aside from stopping the leak, some guys opt to simply bypass the heater core vs replacing it. Dec 31, 2019 · Likes: 160. 0. :cheers: You can buy the radiator hose for a 96. feel around on the pass floor and Jun 30, 2013 · C3 Tech/Performance - Bypassing Heater Core - Hi folks, My heater core is leaking and I don't need no stinkin' heater. No-Hassle Returns. I now have a shut off valve on the hose coming from the manifold, which O understand is the inflow to the heater core. Remove heater core from duct and replace. Don't forget to install the gasket around the heater core pipes where they enter the chassis, keeps the fumes out of the car. The original inlet hose connected to the T on the reservoir. Feb 5, 2002 · The heater core is for the heater to work. Your Price: $ 89. This is a 77. I have read many posts on this forum already so i will not ask you how to do it. decided to bypass since i'm a fair weather corvetter anyway. My goal was not to permanently bypass the heater, but just be able to shut it down during the hot Feb 29, 2016 · C3 Tech/Performance - Heater Core Bypass - I recently purchased a Stingray and in short order, the core started to leak. An inlet and outlet, but the bypass is a single hose that is looped from the inlet to the outlet on the water pump. vyxylhmutnrvmruvpgoi