C5 cooling system
Thread Starter
4th Gear
Joined: Oct 2023
Posts: 4
Likes: 3
C5 cooling system
Need advice on what else could be wrong with my C5 base model, car constantly overheats but after it’s turned off and sits for a couple minutes goes back to normal operating temp. Keep finding air in the cooling lines, even after constantly “burping” the system. Just recently replace all the fluid as well as the water pump and thermostats with a 186 thermostats. I know it’s not the fans because they both turn on when temp hits the correct temperature.
Safety Car
Joined: Mar 2017
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From: Orlando Florida
Thread Starter
4th Gear
Joined: Oct 2023
Posts: 4
Likes: 3
wouldn’t that change the color of the coolant though, I always thought the coolant and oil would end up mixing together?
Race Director
Joined: Oct 2004
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Thread Starter
4th Gear
Joined: Oct 2023
Posts: 4
Likes: 3
The air pockets come out when I burp the system, and it’ll run great for the next day or two, temps sit around 205-215 but after the second day temps will shoot up to 240 or so and if I burp the system again a bunch of air pockets will come out
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Safety Car
Joined: Mar 2017
Posts: 3,759
Likes: 935
From: Orlando Florida
The beauty of the blown head gasket test kit is it just requires removal of the reservoir cap. Compression may still have to be checked, but I tend towards the low hanging fruit first.
Race Director
Joined: Oct 2004
Posts: 12,859
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Best way to burp the system is to elevate the front end at least a couple of feet above the rear end. Leave the cap off the tank, start the car and use varying rpms for a couple of minutes. Make sure the thermostat is open. But if this doesnt work, probably a head gasket.....
Thread Starter
4th Gear
Joined: Oct 2023
Posts: 4
Likes: 3
Need advice on what else could be wrong with my C5 base model, car constantly overheats but after it’s turned off and sits for a couple minutes goes back to normal operating temp. Keep finding air in the cooling lines, even after constantly “burping” the system. Just recently replace all the fluid as well as the water pump and thermostats with a 186 thermostats. I know it’s not the fans because they both turn on when temp hits the correct temperature.
Race Director
Joined: Oct 2004
Posts: 12,859
Likes: 4,658
