Question about 1998 Jeep Cherokee

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Jeep temperature light comes on sitting at drive thrus on hot days. don't know how to check electrical cooling fan

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  • Jeep Master
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First thing you need to do is check the fan motor. You do that by unplugging the fan connector and hot wiring the motor to the battery. If it's good it will run.
The remainder of the system works this way: The temperature sender on the thermostat housing sends info to the computer which sends a ground signal to the relay in the power distribution center (or below the r/f headlight). the relay closes and sends power to the fan motor.
Computers rarely fail so you need to check the other components and wiring connectors.

Posted on Aug 05, 2010

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1 Answer

Overheating when I sit idle.


Over heating the engine is a serious concern. With the hood raised you should hear the motorized fan turn on just behind the radiator as the engine requires additional cooling.. If you look in from the rear of the radiator you should see the fan blades.

This electric powered motor operates on a thermostat and when the engine temperature rises this fan should come on. I'm assuming from your description that when driving and air is flowing through the radiator as the car travels the engine is nor overheating.

Check fan motor thermostat, check fan motor and check wiring.

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http://www.wiringdiagrams21.com/category/automotive/honda-automotive/civic

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Have a BMW 325i 2005 when driving after 10 min the temperature gauge lights up yellow meaning engine to hot I can still drive it at a slow speed how do I fix this problem


It could be the electric fan that cools the radiator is not working correctly check to seevthat it comes on when the car Warms up.
check for loose connections or blown fuses. Hope this helps

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Temperature gauge rises, coolant is not leaking? and have full tank of it. "Low Trac" light always comes on, then the anti-lock and "track off" light comes on and stays on until my car...


IF COOLANT TEMPERATURE RISING,CHECK TOP RADIATOR HOSE IF TOP RADIATOR HOSE IS NOT HOT REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP.IF ALL IS GOOD.IF CAR OVERHEAT WHILE SITTING IN A LONG TRAFFIC LINE.THE COOLING FANS NOT WORKING,CHECK COOLANT FANS FUSE AND RELAYS.IF BOTH IS GOOD.HOT WIRE TO SEE IF COOLANT FAN TURNS ON IF NO FAN MOTOR BAD.IF YES FAN MOTOR GOOD. PROBLEM COULD BE FAULTY COOLING FAN WIRING OR BAD ENGINE COOLANT TEMPERATURE SENSOR BAD OR FAULT IN THE PCM.

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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

Car runs hot. Its 2005 grand prix


Start by flushing your coolant system, then refill with a quality coolant.
Run up to temperature and check again for level (when cool again)

Check that the radiator is getting really hot quite suddenly when running from cold, as this is the best way of checking thermostat operation.
When over a set temperature (check your manual) the fan should come on.
If it never does - troubleshoot the fan (temperature switch or sensor first, then fan on direct feed to see if it powers up ok)

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1 Answer

97 jeep cherokee electric fan problem


sound like coolant temperature sensor is open or not working.scan it to see when engine get operating temperature when coolant temperature get 190 degrees the coolant temp sensor should show 190 degrees if it shows 80 degrees or lower it not working replace it.the coolant sensor control coolant fan.when it gets hot it resistance changes or lower.the pcm grounds it .then cooling fans will run.

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2 Answers

Engine overheating


Actualy check the clutch fan. It might still turn but its not engaging annd is having no effect in cooling the motor.

Mar 22, 2009 | 1997 Jeep Grand Cherokee

1 Answer

Over hearting


Hi Fooch!

Does the Jeep have electric radiator fans, or is it a conventional engine pulley mounted fan?

Your description sounds like fan failure, wherein the engine overheats when stopped or moving very slowly, due to not enough air being moved through the radiator to cool it down.

This can be confirmed by sitting stopped until the temperature goes up and then driving at normal road speed... if the temp comes back down, this is the problem.

With electric fans, this can likely be caused by a bad fan temp sensor, bad fan motor, bad fan relay, or by a wiring problem...among other possible causes.

With a mechanically driven fan, this can be caused by a bad fan viscuous clutch, missing fan shroud, or possibly loose belts.

A bug/debris clogged radiator will exacerbate the problem, whichever type fan you have, so a trip to the self-serve carwash to clean the radiator is not a bad idea, either.

Hopefully this will help and get Mom off your **** for breaking her car. Let me know how it goes or if you have more questions, and GOOD LUCK!!!

-WildBill

Jun 16, 2008 | 2003 Jeep Liberty

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