Over heated
Thread Starter
7th Gear
Joined: Feb 2009
Posts: 7
Likes: 0
From: Crescent City ca
Over heated
I just bought a 1999 covertable corvette. I've only had it for a week. We were driving it and it overheated. Does anyone think that it might be the thermostat? Also the oil pressure gauge is all the way to 80, even before you start the motor. I just turn the key on and it goes to 80psi. I need some help please. I hope it can be fixed. I took it back to the dealer. I dont think it had any dex-cool mix in it either. i hope I didn't buy a lemon. It is a beautiful car.
Last edited by diane9659; Feb 8, 2009 at 04:08 PM.
Racer
Joined: Feb 2007
Posts: 431
Likes: 5
From: Chico CA
Also per Bill Curlee, check the grounds. Being close to the ocean, the likelihood of corrosion is higher. I have to agree that this one is probably the sender, but weak grounds will cause the electronic gremlins to pop up all over.
Burning Brakes
Joined: Sep 2007
Posts: 860
Likes: 3
for the over heating problem I would also suggest that you reach up in front of the radiator (from underneath) and check to make sure there's no buildup of leaves and plastic bags - the airflow on C5s will suck things up in there. blocking the airflow.
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And your oil pressure issue is simply the sending unit. As the others have said, there are DIY tips in C5 Tech - otherwise it would be a fairly simple fix for an experienced mechanic, in our shop it's about two hours of labor give or take....
I doubt if you bought a lemon - these are fairly common issues with the C5. Post some pics of the car when you get a chance....we all love pics even though we know what they look like!
Last edited by blacksedan87; Feb 8, 2009 at 05:44 PM.
Melting Slicks
Joined: Jan 2002
Posts: 2,754
Likes: 0
From: Nokomis FL
I also had a hair line crack in my coolant tank that caused pressure leak down. Tank is about the same price as the thermostat.
Thread Starter
7th Gear
Joined: Feb 2009
Posts: 7
Likes: 0
From: Crescent City ca
I have to tell you guys. My car is back on the road. It was the thermostat. YEAAA!!!! All I have to do now is the oil pressure sending unit. Thank you again so much for everyones help and suggestions. You made me feel a whole lot better. good information. I love this website.
Le Mans Master
Joined: Feb 2002
Posts: 6,937
Likes: 21
From: Waldorf MD
I bet your car is not overheating, they run hot, see here:
C5 Cooling Fans Operation
The low speed cooling fan is commanded on when the coolant temperature reaches 108°C (226°F). It is turned off if the coolant temperature lowers to 104°C (219°F). The high speed cooling fan is commanded on when the coolant temperature reaches 113°C (235°F). It is turned off if the coolant temperature lowers to 108°C (226°F). When the A/C is on and the coolant temperature reaches 85°C (185°F), the low speed cooling fan will be turned on at vehicle speeds less than 56 kPh (35 mph).
Your oil pressure sensor is probably toast. If with the ignition switch on, and the engine off, it shows oil pressure, it is your sensor.
C5 Cooling Fans Operation
The low speed cooling fan is commanded on when the coolant temperature reaches 108°C (226°F). It is turned off if the coolant temperature lowers to 104°C (219°F). The high speed cooling fan is commanded on when the coolant temperature reaches 113°C (235°F). It is turned off if the coolant temperature lowers to 108°C (226°F). When the A/C is on and the coolant temperature reaches 85°C (185°F), the low speed cooling fan will be turned on at vehicle speeds less than 56 kPh (35 mph).
Your oil pressure sensor is probably toast. If with the ignition switch on, and the engine off, it shows oil pressure, it is your sensor.