HOW DO YOU CAHNGE THE THERMOSTAT ON A 2002 CADILLAC DEVILLE. THE CAR IS OVERHEATING WHILE DRIVINGF WITH THE AC ON.
The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.The hose goes in to the engine to a crossover and comes out the other side to near the thermostat housing,the blockage may be there.
I have a Cadillac Seville dhs 2002and the coolant is coming from the coolant bottle
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