Question about 2009 Cadillac CTS
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Posted on Jan 02, 2017
SOURCE: 1990cad deville overheating
the first thing to check is to have the engine running. as soon as it reaches operating temp the upper radiator hose should get hot. if it doesn't then it's the thermostat. if it does then i believe your water pump is probably not circulating like it should and it should be replaced. however before replacing the wter pump make sure that the wire to sending unit is tight and not giving you a false reading. if your model has electric fans make sure the fans are running when the engine is hot. if they are not running check the relay in the fuse box for the fans with the engine running switch out the fan relay with the a/c clutch relay. ifthe fans kick on replay the relay with a new one. if they don't click on the it's either a bad wire or the temp sensor probe is bad. hope this answers your question. please rate this solution...thanks.
Posted on Aug 30, 2008
Hi,It sounds as though the radiator is blocked.the heater might be opening letting in hot air which will over ride the cool air.
Posted on May 24, 2013
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