How can I fix my overheating problem?


Asked by Sep 21, 2014 at 11:57 PM about the 1986 Chevrolet Corvette Coupe

Question type: Maintenance & Repair

Hello, I have a 1986 corvette that keeps heating up and I have tried everything. I've literally changed the thermostat, radiator, hoses, water pump, checked for timing, fuel injectors, and practically cleaned out everything that has to deal with the cooling system. I've also searched for any leaks and found nothing, took my C4 to mechanics and asked them to check what the problem was and every single one of them told me that nothing was wrong. I am asking you guys to help me please, ever since I've bought this car its been heating up and has been for almost a year. Can you guys help me solve this big problem?

7 Answers


If there are no leak,s,and no fluid lost,and car has no skip,you may want to check the fan clutch,may be bad ,not turning properly will do this.

1 out of 1 people think this is helpful.

Ohhh I also forgot to mention that I've changed the fan as well and replaced it with a high performance 2360 cfm fan, which worked well when I had barely installed it but within 2 days the temperature started rising again. With the stock fan the temperature would exceed it's boiling point which is 300° , But with the upgraded fan it still boils over reaching 265-270°

1 out of 1 people think this is helpful.

Good old corvettes ... Has the motor been rebuilt ? Bored cyl.cause more heat transfer from cyl. To the water jacket.. Vets are always having this problem .. Big motors in small spaces.. You can try / radiator with a bigger core or a universal electric fan to assist clutch fan... If you have the space to mount it.. Good luck..


Clearly system heat is not being released. Are you certain there is no air pocket, and coolant is flowing freely? Hoses firm & under pressure? Even new radiators, thermostats and water pumps can have issues. Is it possible someone used a stop leak product at some time? This can clog engine coolant galleries, or restrict them, a flush or fiber optic inspection may reveal blockage. Recheck your new water pump that it is directing coolant properly, GM has several that will fit but pump in different directions. My bet is something is impeding coolant flow, that high performance fan alone you installed would remove enough heat. Try these forums also: also your local corvette club if you don't belong already. cheers.

2 out of 2 people think this is helpful.

Have someone with a hear sensor gun shoot your engine and find where the hot spots are. If they are in the heads, the water flow jackets may be plugged. I had this problem several years ago and after tearing the heads off, discovered the gaskets were a universal style made for several motors. Some of my water jackets were blocked by the gasket. The gaskets had perforations to open the water jacked holes if there were ones that were blocked by the "universal" gaskets. If you upped the horse power of the engine, remember, there are more houses under the hood and more HP equates to more heat. Make sure the heat gauge is working correctly and the heat sensor is good. If you are using the A/C in town and it heats up, pop the hood release and see if the additional release of air around the hood helps increase the air flow and reduce the trapped heat. Just don't slam on the brakes as the hood may open. Normally the driving will produce enough air down draft to keep the hood in place. Do you have a proper radiator cap? That has been an issue in the past for people also. Little things can create big problems. Also is the radiator fluid the proper mix? Do check the direction of the water pump as suggested above. Morons in parts stores sometimes don't know there are two different directional flow pumps and don't check or ask what you need.

2 out of 2 people think this is helpful.

Did you flush the system , and add new water and antifreeze??

1 out of 1 people think this is helpful.

Jump the relay connection to the fuse box. Fan will run when you start the car. Such a simple and great way to cool em down.

Your Answer

Add photo

Related Questions

  • 1986 corvette overheating problem. 25 answers

    My corvette is overheating after replacing the gaskets on the intake manifold and cleaning everything else out. I replaced the thermostat, fuel injectors, IAC. I put it all back together and it starts...

    1986 Chevrolet Corvette Coupe


    Maintenance & Repair

  • 1995 C4 Corvette. Overheating engine shut off 7 answers

    So I bought my 16 year old son a cool car, classic 1995 Corvette and its been in the shop more than he has been able to drive it. Mechanic struggling to get the car from overheating. replaced the ra...

    1995 Chevrolet Corvette Coupe


    Maintenance & Repair

  • I have the' 90 Vette L-98 coupe, with the overheating problem at a idle, can't burpe the air out of system correctly through the radiator cap. Really need the bleeder on the thermostat housing like 5 answers

    on the' 92-'96 models. Anybody know of an aftermarket bleeder housing out there? Or can I have a bleeder threaded into mine somehow? Any Ideas? Thanks for all you're previous help too. KMAC.

    1990 Chevrolet Corvette Coupe


    Maintenance & Repair

  • Overheating engine 3 answers

    I have a 1991 Corvette that runs in the red zone. I took out the thermostat It still runs hot . I drained the radiator and installed new antifreeze. I didn't open the bleeder valves. All the hoses are...

    1991 Chevrolet Corvette Coupe


    Maintenance & Repair

  • Overheating 16 answers

    I have a 98 Cavalier overheating, i've changed the hose from the firewall to where ever (transports the antifreeze). Also the heat switches back and forth from hot to cold. This car has NOT had a the...

    1998 Chevrolet Cavalier


    Maintenance & Repair


Looking for a Used Corvette in your area?

CarGurus has 20,148 nationwide Corvette listings starting at $3,495.


Search Chevrolet Corvette Questions

Chevrolet Corvette Experts

#1 John Carson
John Carson
Reputation 2,190
#2 carGrrl
Reputation 1,370
#3 Vincent Parker
Vincent Parker
Reputation 1,260
View All

Related Models For Sale

Used Chevrolet Camaro
152 Great Deals out of 32,722 listings starting at $1,995
Used Ford Mustang
365 Great Deals out of 46,760 listings starting at $1,500
Used Porsche 911
85 Great Deals out of 4,520 listings starting at $11,992
Used Dodge Charger
279 Great Deals out of 26,758 listings starting at $2,250
Used BMW M3
38 Great Deals out of 1,711 listings starting at $4,544
Used Ford F-150
2,223 Great Deals out of 208,132 listings starting at $1,499
Used Mercedes-Benz SL-Class
43 Great Deals out of 2,980 listings starting at $2,900
Used BMW 3 Series
943 Great Deals out of 33,257 listings starting at $1,000

Used Cars For Sale

2017 Chevrolet Corvette For Sale
3 Great Deals out of 10,240 listings starting at $45,711
2016 Chevrolet Corvette For Sale
8 Great Deals out of 1,551 listings starting at $42,602
2015 Chevrolet Corvette For Sale
7 Great Deals out of 659 listings starting at $40,995
2014 Chevrolet Corvette For Sale
821 listings starting at $36,991
2013 Chevrolet Corvette For Sale
8 Great Deals out of 377 listings starting at $24,000