Over heating
Check that two fans are turning on when you turn the a/c on or when it gets to 222 deg. F according to the gauge, and shuts off when it gets down to 212 deg. F.
May have a problem with relays, wiring contacts at the relays, fuse, or the relays themselves. Also, the fans on Cadillac Devilles from 1997 have multiple speeds depending on demand for cooling.
In summary, I would check fans.
SOURCE: 1996 cadillac deville overheat..radiator?
Check for coolant flow at the Purge line,this is a common problem on the Northstar.
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.
SOURCE: 97 cadillac deville only overheats on hills it has
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: I have a 96 Cadillac Deville. The car overheats
i would get a radiator tester to make sure there is no air leaking out at a slow rate
SOURCE: why does my cadillac deville heat up
If you look by the Radiator there will be an Electric fan motor. This Radiator fan may have 2 speeds. When the A/C is turned on, it will turn on at least low speed. Otherwise Water Temperature sensors make it work and spin to cool the Radiator.
You need to have this circuit checked. You need to find out if the Electric fan is any good and if both speeds work. The sensors for the fan may not be turning it on or may not be turning it on with High speed. Some Models have a Water Temperature sensor and some have a second sensor just for the Water gauge.
You need to investigate just the part that turns on the Electric Radiator fan.
There may be fuses for the Relays which operate this Radiator fan. The Relay that gets the signal from the sensor may not be working either.
While it sounds like a lot of parts, it makes sense when you know why the parts are there. A Temperature sensor turns on the Relay which has the strength to connect and maintain power to the Electric Radiator fan and operate the multiple speeds. If a fuse breaks, there is a bad part in the system. Just replacing a broken fuse will not fix the bad part.
You need to trace down the bad part and get it off your car. If you already have paid a shop and the car is not fixed, then they should investigate what I am writing to you. Morally, they should continue to test your car for the money you paid to keep it from overheating.
The parts you put on it already will not hurt and could have been part of the problem. Now you need to get the rest of the problem fixed.
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