SOURCE: 1997 cadillac deville concours stability reduced message
press and hold the off and red warmer button on your ac control panel / the display should then go into diagnostic mode. all the trouble codes can be read out to help in tracing down the problem. you can also read out other info by pressing the temp up or down button when in diag. mode. press the off button when your done.
SOURCE: 1999 cadillac deville air wont work
There's a blower motor (fan) under the hood and up against the firewall near the center of the car that takes some work to remove. It has gone out in the last 2 of my 4 Cadillacs. Turns out if you're not real careful with the positioning of the spark plug wires they will brush up against it, and if one of them gets cracked or brittle it will "arc" and short out the blower motor. The a/c compressor should still come on (you'll hear a click when it engages) but you won't get any air blowing into the cabin, hot or cold.
The part was like $200 stock (year 2000 prices) and it took about an hour to remove it. My Caddy at that time had this damn strut bar going across the engine bay which we eventually removed to get to the blower motor.
SOURCE: thermostat location on a 1999 cadillac deville concours
looked it up online and looks like it's on the front of the water pump in a thing called the coolant inlet housing. one end of it looks something like the letter y and the other end, where the thermostat is round. hope that helps
SOURCE: 1994 cadillac deville concours
On my car, which is the same as yours, it is located on the manifold top back left. Pictures in the book just show it on top.
SOURCE: 1999 cadillac deville runs hot what are my options
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.
Also note that the cooling fans don't come on until the temp hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.
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