Question about 1999 Cadillac DeVille
1st, waqs losing coolant. found it was the tank cap. replaced and pressure tested the system. next found a leak from a silicone hose under the egr valve. replaced. ran the car, and the tempurature was raising! above 45 mph the temp would raise to 228degrees. driving thru the city temp would drop and stay at about 217degrees. which is funny seeing how the faster the car is moving the lower the temp should drop. but it was doing the exact opposite. replaced the thermostat and water pump. will drive like a dream on the way into work. 196/197 on the freeway and raise up to about 206degrees in between stop lights. when driving home will start the same as in the morning. then if i am slowed by some traffic, or what have you, temp will get up to 228degrees. shut a/c off and temp will drop stay at about 215-219 degrees. fans are cycling on and off. my 1st question is what is the standard oem operating tempurature for this car, and 2nd, what caould be the fix?? please help! the car is a 1999 cadillac sedan deville. 113,000 miles. had only 1 previous owner.
First with the car off and cool squeeze bottom radiator hose with your hand then do the top,this burps any air out of the system,of course have the cap open,if this doesnt solve the problem its your radiator cores are block as you speed up its trying to force coolant thru a blocked core and temperature rises,you can pull your raidiator and have it cored at a radiator shop,cheeper than buying new
Posted on Jul 07, 2008
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Posted on Jan 02, 2017
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