Question about 1998 Cadillac DeVille

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Car reached 250 degrees

First it reached 220, then i made it to a store 2 miles away and it reached 250 when i pulled in.

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Check Cooling FAN & Its RELAY, Also the Primary TEMP Sensor.

Posted on Jun 04, 2010

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1 Answer

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Does the engine reach normal operating? How hot does the engine get in degrees F? The low speed may not come on till about 220 degrees F. The fans may come on, if you turn on the ac, under the proper conditions.
Check for applicable trouble codes, to check codes, yourself, at the least, you need an obd2 code reader. Some of the national brand auto stores will check codes for free, if there are any. Also, check coolant temp sensor. Don't replace anything unless your testing points in the direction. Check applicable fuses.
I'd check codes, first.

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250 is not low, it is just about to boil over, coolant boils at 260 in a closed system, water boils at 120.Your car should not exceed 200, 220 max. Or just 100 degrees over the outside temp, like 87 degrees out, your car should be running at 187. Until you stop at a light and it idles for a minute, then it will climb.

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Check the fuse and relay for power. The fans come on when the engine reaches 220 degrees or when the ac reaches 200psi.
Is the check engine light on ? It should store a trouble code.

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Yesterday our 2002 safari started cold and within 2 miles the tempature went to 250 degrees. We stopped and let it cool for 2 hours, again the temp went up within a mile. I replaced the thermostat but it...


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this was caused by the cap being gone, there is zero doubt of this, I hope u have not damaged the cylinder head gaskets, time will tell.

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