Question about 1999 Cadillac DeVille

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Radiator fans won't come on located one of three relays that keeps getting hot.relays in trunk not labled . or maybe cooling sensor? not sure what to do

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  • rusprchr1 Jul 03, 2010

    no fan fuses located. manual states 3 relays. relay panel in truck behind seat. total 12 relays, no chart as to what they are for.

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  • Master
  • 6,784 Answers

HI. I have a very thorough, step by step procedure that will help troubleshoot this issue. follow carefully, to isolate the problem, Use extreme caution when preforming this inspection procedure.



A.First, you will need to check for broken wires or loose connectors around the fan circuit. Inspect connectors at the fan motor, relay, sensor or heat sensitive switch, and the Electronic Control Module (ECM)--your car’s computer control system. Also, make sure to check for a possible blown fan fuse. These are common and overlooked troublesome spots that may cause a fan to fail.


B.Run and bring the engine to warm temperature. With the engine running, use a voltage test light to check for power to the motor fan. Be extra careful and make sure to keep your hands and tools away from the belt, fan or any other engine moving parts. If voltage is reaching the fan motor, the test light should glow.


C.Turn off the engine after you see the light glow. Apply direct voltage to the fan motor from your car battery using a pair of spare wires. If the fan fails to operate, replace the fan motor. If the motor operates, your problem is in the motor connector.


D.Locate the heat-sensitive switch or heating sensor if the fan motor operates with direct voltage and the test light did not glow. You should find the sensor in the radiator, engine block, or thermostat housing.


E.Measure the resistance across the heating sensor with the multimeter. With the engine at cool temperature (engine off), it should register infinite resistance; with the engine at warm temperature (engine off), you should read low resistance. If both readings state infinite resistance install a new heating sensor, that’s the cause of your failing fan.


F.Check the action of the fan relay if the heating sensor is registering variable resistance. Your service manual should specify the power and ground wires according to color codes and the proper way to test it. If the fan relay fails the test replace it with a new one.


G.Check the connections going to the ECM after you determine the fan relay is working properly. If you find broken wires or loose connectors, make the necessary repairs. If you suspect a defective ECM take your vehicle to a service shop for a computer analysis. In most cases, the ECM is rare to be the cause of a failing fan. The above steps should take you to the root cause of your problem and help you fix the cooler fan.

Posted on Jul 03, 2010

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  • Cadillac Master
  • 14,036 Answers

CHECK COOLING FAN FUSES YOU HAVE 2 FUSES FOR EACH FAN.IF FUSES OKAY.THE RELAY GETTING HOT COULD HAVE FAN MOTOR GOING BAD OR POOR WIRE CONNECTION TO FAN MOTOR.IF ALL LOOKS GOOD COOLANT TEMPERATURE SENSOR BAD OR FAULT IN THE PCM.

Posted on Jul 03, 2010

  • Jonah Oneal Jul 13, 2010

    YOUR COOLING FAN RELAYS IN THE ENGINE COMPARTMENT.I AM LOOKING AT CADILLAC AC AND ENGINE COOLING FAN ELECTRICAL SYSTEM DIAGRAM.NOTE FROM CADILLAC IF ONE COOLING FAN RELAY BAD IT WILL KEEP THE OTHER COOLING FAN FROM COMING ON.REPLACE THE RELAY THATS HOT.IF FANS STILL DONT COME ON.THE COOLANT TEMPERATURE SENSOR BAD OR PCM PROBLEMS.HAVE CAR SCANNED FIRST BEFORE BUYING ANY PARTS.CADILLAC PARTS IS EXPENSIVE.

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http://whatisbyme.blogspot.in/2012/07/cooling-fan-stays-on-with-ignition-off.html
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http://technoanswers.blogspot.in/2012/02/cooling-fan-relays-location-on-1998.html
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