Question about 1999 Cadillac DeVille

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I have a problem i have changed the rrelay and the

I have a problem i have changed the relay and the temperature sensor bot the fans will not turn on

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Try the fan control module.

Posted on May 09, 2009

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3 Answers

Why does my fan always run intermittently? During traffic jams my fan will run about 25 times intermittently, and I check my temperature it is still normal?


sounds like problem with the temperature sensor or relay that controls the fan(if electric) check the sensor and relay one may need to be replaced.

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Fan sensor is not working.


You need to change the relay and the temp sensor switch. If you have done that the reason it's not coming on is probably because the coolant is not getting hot enough to cause it to come on. Let me explain. The coolant fan when the A/C is off is activated by the coolant fan switch. The switch closes when coolant temperature is over 238F completing a path to ground through the coolant fan relay windings. The relay contacts then close and voltage is applied to the coolant fan. When the coolant temperature drops to 214F, the switch opens and the coolant fan stops. In A/C equipped vehicles, the A/C control head completes a path to ground for the coolant fan relay whenever the A/C is on no matter what the temperature. Voltage is then applied to the coolant fan. Essentially, the coolant fan switch is by-passed when the A/C is on, which is why the fan works whenever you turn the A/C on. Now, if the fan does not kick in when the coolant temperature is over 238F but works when the A/C is on, the problem has to be the coolant fan switch or the connectors or wiring to the CFS.

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1 Answer

Overheating at idle but fan works when a/c is on


The A/C is linked to the fan and that is why the always comes on when you switch on the A/C.
There is also a temperature sensor/relay that monitors the engine water temperature and turns on the fan when the water temperature is hot.
This temperature and relay maybe faulty. Check the fuse that controls the fan, if it is OK then the temperature sensor or relay is faulty.

Apr 08, 2012 | 1995 Jeep Grand Cherokee

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Over heating


You may have a faulty fan temperature sensor or a faulty fan relay.
Check the fan relay first to see if the relay is OK, if it is OK then check the fan temperature sensor.

Mar 31, 2012 | 2003 Volvo XC70

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Heater fan stays on will not go off, even when car turned off


If the temperature sensor/transducer is faulty then it is possible that this will trigger the fan to stay on . Also if the fan relay is stuck up or jammed in contact then it is possible that the fan will be powered. remove the temperature sensor and the fan must stop ,if so change the unit.
if not tap on the relay on the main relay box to release, if so replace the relay.

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1 Answer

Engine fan won't come on


IF COOLANT FAN FUSE AND RELAY OKAY.HOT WIRE COOLANT FAN TO SEE IF FAN MOTOR OKAY.IF FAN MOTOR OKAY.THE ENGINE COOLANT TEMPERATURE SENSOR MORE LIKELY BAD.THE ENGINE COOLANT SENSOR WHEN ENGINE COOLANT GETS HOT IT CAUSES ENGINE COOLANT TEMPERATURE RESISTANCE TO DECREASE CAUSE COMPLETE CIRCUIT IN WHICH POWER FROM PCM TO ECT SENSOR WILL SENT POWER TO COOLANT FAN RELAY THEN CAUSE COOLANT FAN TO TURN ON. HAVE ECT SENSOR OR ENGINE COOLANT TEMPERATURE SENSOR CHECK USING CODE SCANNER TO MAKE SURE ITS WORKING BEFORE SPENDING EXCESS MONEY.

Jun 18, 2011 | 1998 Ford Taurus

1 Answer

Engine cooling fans don't come on


COOLING FANS DONT TURN COULD BE FAULTY FAN RELAY.FAULTY PCM AND FAULTY COOLANT TEMPERATURE SENSOR.CODE SCAN FOR FAULTY PCM CODE AND A FAULTY COOLANT TEMPERATURE SENSOR.SEE IF ENGINE COOLANT TEMPERATURE SENSOR IS GIVING CORRECT COOLANT TEMPERATURE USING A CODE SCANNER.IF ENGINE IS 190 DEGREES AND THE ENGINE COOLANT TEMPERATURE SENSOR READING 100 TO 80 DEGREES COOLANT SENSOR IS BAD.HOT WIRE COOLING FAN TO SEE IF FAN MOTOR WORKS.BECAUSE COOLING FAN MOTOR COULD HAVE OPEN CIRCUIT CAUSING ELECTRIC MOTOR NOT TO TURN ON.

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1 Answer

Have changed fan relay and temperature sensor fans still will not


Heather, the radiater fan relay is solid state, mounted behind the facia
on a bracket drivers side, right of left headlamp assembly, feed by fuse 24, 40 amp in the pdc, box, I'm assuming thats what your talking about, the coolant sensor signals the PCM ,when temp hits 212*F, tells the solid state relay to turn the fans on, check the ground for the fans, should be near the relay. if by chance you have no air lock in the cooling system, after the pump was replaced. Belt routing ok, was this done by experinced help. GOOD LUCK, RDJRP

Oct 01, 2009 | 1998 Dodge Caravan

1 Answer

Changed radiator fan relay but fan still doesn't work (Fan motor ok)


What year is the vehicle? Your coolant temperature sensor may be bad which indicates the system when to turn the electric fan on and off with engine temperature and also a a/c clutch switch that turns the fan on with a/c usage. If the temperature sensor is not operating properly your fan will not come on. Depending on the year, you may have TWO sensors; one is for gauge operation and the other for the PCM and the fan, also known as the ECT (engine coolant temp). It should be a fairly cheap part.

Good luck!

Aug 30, 2009 | Pontiac Firebird Cars & Trucks

3 Answers

The cooling fans will not turn on


the relays or fuses might of came unplugged even

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