Question about 1998 Cadillac DeVille

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Where are the cooling fan relays for a 1998 Cadillac Deville Northstar located?

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  • Anonymous Mar 26, 2014

    Starter relay 1997 Cadillac Deville where is it located

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Are you sure that you don't mean the cooling fan control module? It should be located up front next to the cooling fan. It is square shaped and has a long square shaped plug going into it. Where are the cooling fan relays for a 1998 - 00114_cooling_fan_control.jpgReads the temperature of the coolant and passes the information to the engine control computer (ECC). The ECC receives analog information and signals the cooling fan switch to cycle the cooling fan on or off, as required.








Posted on Jul 08, 2009

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Where are the cooling sensors in 1997 deville


SENSOR ON NORTHSTAR V8 IS ON DRIVERS SIDE OF MOTOR RIGHT ABOVE TRANSMISSION. COOLING FAN RELAYS ARE UNDER FANS ,IN MIDDLE OF LOWER CROSSMEMBER

Nov 23, 2012 | 1997 Cadillac DeVille

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Where is the cooling fan sensor located on 1998 cadillac deville 4.6 northstar


The fans /fans are turned on by the pcm, using input from the coolant temp sensor, as well as the HVAC system. The cts is on the right rear of the engine below the egr valve.

Sep 24, 2011 | 1998 Cadillac DeVille

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My Cadillac Deville, 2002 northstar is running hot........or the temp gage goes up and I have to stop driving..I have a new thermostat,relay switches for the fans,temp control sensor and a new coolant...


Check the fan to see if it is going on. On my 1997 Cadillac Deville Limousine I had to have the 2 fans, and 3 relays replaced, as well as the wiring contacts for the relays at an auto electric shop for about $700 last fall, but it has been running cool since then.

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1998 cadillac deville , cooling fans for rad will not come on and I already replaced the AC comp relay


The only other things would be the coolant temp sensor or the engine computer. Alot of the new GM's have the on and off function of the cooling fans controlled by the computer. If the coolant temp sensor is ok, then most likely the problem is in the engine computer.

Oct 22, 2010 | 1998 Cadillac DeVille

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My 1998 cadillac deville overheats only when i turn off the a/c


The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,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 close to the thermostat housing,the blockage may be there.

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1 Answer

Locate fan relay


There are three cooling fan relays in the fuse block under the hood.

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The fan relays above are numbered 37,39 and 40

Relay 37 is RH fan
Relays 39 and 40 are LH fan.


You can check if your fans are working by switching on the air con.
Are you having overheating problems?

Regards.

Apr 26, 2010 | 1998 Cadillac DeVille

1 Answer

Where is the fan relay switch for a 1998 cadillac deville


If for the heater it is a blower module on top of the evaporator core housing. If for the cooling fans it is inside the front fender behind the headlights. That is a module also tice the size of a normal fist

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Radiator fan


check relays located under back seat. u should have a cover that tells you witch one is witch and where

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Left Hand Side Of Engine Compartment On Relay Bracket

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