May be a defective relay that is enguaging for itself .normally happens with water wetting the relay ....
SOURCE: 2002 Cadillac Coolant sensor
The engine coolant temperature sensor is located on the driver side of the engine near the rear of the engine compartment
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: HOW DO YOU CAHNGE THE THERMOSTAT ON 2002 CADILLAC DEVILLE
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.
SOURCE: my 2001 cadillac deville the service engine soon
hi, well i would have to disagree with the computer, all this is actually telling you is that you have a service due, what this means is, when you take it to a garage and get a main service like, plugs, leads oil, brake checks and adjustments, transmission fluid change, filters changed, ect ect, the service interval is reset to a certain mileage , when it is coming up for the next service, it will remind you of this again when you get close to the end of the mileage required, ie, if you have a service every 15,000 miles, it will be reset to 15,000 miles, but when you get to, lets say, 2,000 miles left to go before next service, this will then come on and inform you that you have only 2,000 miles left before your next service, i hope i have explained that correctly for you..
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