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Old 05-15-2002, 10:33 PM
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Post Battery heat?

A friend of mine has a 1986 caddilac deville, this car has had many problems, it overheats on stop and go driving, the service engine soon light comes on repetedly and goes off and when she parks the car the engine compartment is hotter on the side with the battery (drivers) put it in the shop repetedly but they don't do anything to really fix the problem, it keep happening every once and a while, any thoughts? I'm lost neck deep in this.

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Old 05-15-2002, 11:15 PM
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the only thing that i could think that it would be is and exhaust leak that comes and goes. the sme thing happens to my freinds 87 chevy truck. sometimes youll open the hood and it feels like a sweat room and sometimes it won't. good luck with it.
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Old 06-01-2002, 05:01 PM
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Just wondering if you figured it out yet. EGR valve?

[ June 01, 2002: Message edited by: 72 chevy ]</p>
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Old 06-01-2002, 07:58 PM
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I think these cars have dual O2 sensors and perhaps there is an O2 sensor going bad on one side and causing a lean condition. This would cause one side to run hotter than the other and lead to that side of the engine compartment getting hot. O2 sensors can fail intermittently so this would be something to check, if the car has over 50K on it since a O2 sensor change they will be close to failure anyway. Rarely do these sensors last 100K and typically fail at the 60K mark. What did the codes say when they were doing a computer check? There should be a printout with the bill, if not change garages. Any persistant codes will give a history of the problem to date, the Cadillacs have the latest computer diagnostics built in typically and were the first GM models to have the OBDII modules installed (not sure what the first year was).
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Old 06-03-2002, 03:07 PM
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Didn't check the O2 censors, it running alright now, just shifting hard, I'm honestly sick of seeing the car, doing some bodywork on it right now. I'll check the O2's this week sometime, didn't see the diag. I'll check it myself if I can find my old code book, thanks guys, I'll let you know what I find out.

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