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Need help with overheating

Old Aug 1, 2009 | 11:45 PM
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Default Need help with overheating

The 2002 Z06 is overheating at the road course track. I can do about three 3 mile laps at speed before the engine coolant reaches 260-300 degrees. I replaced the coolant tank, checked for leaks, didn't find any, pulled the thermostat out completely, but it's still happening.

It's hot out here, truly. Air temp in the shade is 104, the track is 120+. It may be that it's just hot... but I have another corvette running with me that's doing well with 220 water temps. The car is losing a gallon of water per session.

I don't know what to check next. Ideas?
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Old Aug 2, 2009 | 12:21 AM
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Have you upgraded to DeWitts or others? Also, you must make sure there is no trash in condensor or rad or between them. As hard as it is to do, it really helps to hit it with some air. You should make sure shroud is sealed so that all air coming in has to go thru rads. HTH. Good luck.
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Old Aug 2, 2009 | 01:14 AM
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Yeah, I was going to say the same thing...make sure the condensor is not being plugged up by debris or tiny rocks.
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Old Aug 2, 2009 | 06:11 AM
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pull the radiator out and clean it with a pressure washer. best cooling mod for a corvette with some miles on it!
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Old Aug 2, 2009 | 08:32 AM
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Thanks. I think I'm going to pull it out and replace with a new radiator, given that a lot of my season here is very hot.

I clean it when I'm under the car, and have compressed air, which is most of the time I'm working on the car.
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Old Aug 2, 2009 | 12:27 PM
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Originally Posted by dgrant3830
Yeah, I was going to say the same thing...make sure the condenser is not being plugged up by debris or tiny rocks.
My problem with my C4 was leaves trapped between the condenser and the radiator. Good Luck!
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Old Aug 2, 2009 | 07:19 PM
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Well, ran the car twice more today, and it overheated both times. However, that was enough to post a time, so it did the job.

I'm going to go get a pressure tester this week and hook it up to see if it's leaking. I'll also check between the radiator and condenser, after I pull the condenser out along with the rest of the AC system. No place for that in a race car.
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Old Aug 27, 2009 | 06:50 PM
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I have no idea about engines . but my C5 was overheating and it turned out, I needed a new water pump, maybe see if your water pumps is broken ... because that is an essential part of the cooling process, I am told.

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