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Re: 97 9000 cse turbo overheating after head gasket. Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Fri, 20 Aug 2004 11:10:20
In Reply to: Re: 97 9000 cse turbo overheating after head gasket., gerry [Profile/Gallery]
, Fri, 20 Aug 2004 07:47:23
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The AC fan is visible with some difficulty by looking into the front of the car - the fan is mounted on the front of the radiator. The fan should come on when the AC compressor kicks on.
I'd have to check a manual, but the Trionic engine control runs the Ac. I'll bet that when it sees high coolant temps, it shuts off the AC to reduce the load on the engine. So I think the AC shutting off was just a symptom of the overheating, not the other way around.
Did the car overheat while you were at a standstill, or while you were moving at speed? If it overheated while the car wasn't moving, I would suspect the radiator fan - the big one on the engine side of the radiator. Make sure the fuse is good. If you take the car for a drive to warm it up, and then stop and let it idle, the radiator fan should kick on before the temp needle reaches the red. I believe that in '97 it was a two-speed fan, which means there is a resistor in series with the fan - the resistor is in the circut for low speed. If that resistor fails, the inrush current of trying to turn on the fan from dead stop to full speed can blow the fuse.
If the fan doesn't run while the gauge drifts up, shut the car off and jumper 12 volts to the resistor to see if the fan will run. If it doesn't then the fan has an issue. Maybe it's bad. Maybe a wire got knocked off during the head gasket install.
If the car overheats when driving with plenty of airflow over the radiator, then I would make sure the belt is OK, that the cooling system is full and pressurizes. A botched head gasket install could cause overheating. Of course, you didn't want to hear that. But check out the other (cheaper) stuff first.
posted by 192.249....
, Thu, 19 Aug 2004 17:37:34, Fri, 20 Aug 2004 07:47:23, Fri, 20 Aug 2004 11:10:20 <-- Viewing This Message
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