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1994 STS overheating


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i recently got a '94 STS a week or so ago, and the guy i got it from, told me the next morning, that he had driven it the night before, for about 20 minutes. he said that the car started running hot and all the coolant/water was coming back out of the cap. i assumed the cap was loose, so i bought a replacement one. unfortunately, the car still kept running hot. i replaced the thermostat, and it doesn't run hot as fast, but when it does everything comes out of the reservoir. not from the cap this time. i ran a system check (holding the off and warm buttons) and this is what came up.

P040 Current

I052 History

A050 History

No SIR Codes

No TCS Codes

S036 History

S038 History

i don't know what any of that means, so hopefully someone can help me, or can tell me what the problem could be. other than running really hot (goes up to about 250) the car runs good. needs an oil change and other minor things.



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You can find your code definitions here.


I assume you checked the water pump belt & tensioner? It's on the rear (drivers side) of the engine. Also check the purge line to be sure it is clear and flows coolant. That's the 3/8" line that goes into the side of the surge tank near the top.

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