Question about 1998 Cadillac DeVille

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My fan is truning slow. I need to find where the temp sensor or the fan realy is so i could check it out. Our what do you suggest.

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If the fan is turning slow measure the voltage at the fan connector, if it is at or above battery voltage then the fan motor is shot, replace it. also verify the connector is not burnt looking which is a common problem.

Posted on Mar 02, 2009


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What is the cost of the Coolant temperature sensor?

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Hi, here is how your system works. The coolant temp sensor get's a reference voltage from the PCM and returns a voltage corresponding to the temp. The PCM then turns on the fan relay onve the temp reaches a certain level. If your coolant sensor is working properly (moving into red or light coming on), then the problem is with the relay, fuse, or the fan itself. Otherwise, it is the sensor.
If the sensor reading is bad, first check the connection to the sensor. If the connection is good, remove the connector and use an ohmmeter to check the resistance of the sensor. It should be as specified below. If not, replace the sensor.
If the sensor indications are good, try swapping the fan relay with another similar relay. The fan realy is usually in a box under the hood--sometimes on the passenger side in front of the shock tower. Finally, if both the relay and sensor are good, use a 12 volt test light or voltmeter to check for power to the fan connector when the engine is running and hot. If there is no power, check the wiring from the fan relay. If there is power, replace the fan motor.
Please let me know if you have any questions, and thanks for using FixYa.

Coolant temp sensor resistance:

-4°F (-20°C)-14.6-17.8 kohms 68°F (20°C)-2.2-2.7 kohms 104°F (40°C)-1.0-1.3 kohms 140°F (60°C)-0.50-0.65 kohms 176°F (80°C)-0.29-0.2 kohms jturcotte_338.jpg

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Possibly a siezed fan, disconnect fan plug, run a wire from positive (+) battery terminal to fan and same on negitive (-) terminal, to the pins on the fan side of the plug dont touch them together while connected to battery, if fan goes it may be a coolant temp on the engine. bypass temp switch with a loop wire on to wiring harness side of the temp switch. Both fans usually only operate when a/c is on.

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2000 jeep charokee laredo

I'm still asking questions but here's how it works...temp sender sends signal to the computer which in turn sends signal to the fan. Only time fan is on full time is with a/c. when in motion, you do not really need a fan because vehicle speed allows more air flow than fan can provide. When driving slow (relative to ambient temp) fan comes on as necessary. If fault is temp sender, wire, ground or real;y the computer sees the incomplete circuit. you need to check to find what isn't allowing power flow to fan. (computer receives low voltage from sensor and completes relay ground...relay sends power to fan. IGNORE BUG PERSON that replied...that is not a fix ya expert...its a spammer!!!!

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1 Answer

Spark plug

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