Question about 2000 Jeep Grand Cherokee

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Engine light staying on

Hi, i was wondering, our engine light came on cus the fan wouldn't kick on. so we replaced it with the sensor it said. but our engine light is still on, is there another sensor for it?

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I do believe many electric fans do have two sensors......one on the engine (maybe two?) and one on the radiator.

Posted on Jul 16, 2009

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Posted on Jan 02, 2017

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Can not get fan to kick on the radator, i can jump it from relay but want kick on buy it self


The PCM -engine computer energizes the cooling fan relays , hi an low speed , according to information received from the coolant temp. sensor. an information programmed into the PCM . Usually around 221 degrees the PCM will energize the low speed relay . Is your car's temp . getting that high ? The best way to diagnose these types of problems is by hooking up a scan tool that can read engine sensor data parameters to see what the temp. of the engine is . Also a scan tool with bi-directional controls , this would be useful to see if the PCM can control the fans ! There could be DTC'S - diagnostic trouble codes stored in the PCM . Not all DTC'S turn on the MIL light , check engine etc..

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I'm showing three fan relays in the wiring diagram.
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Cooling fan kicks on when start of vehicle, the temperature gauge wont read a temp, just stays at "cool". fans shut off when car is turn off.


PCM is probably not getting a signal from the temp sensor, so it's kicking the fans on just in case. Check connector on sensor. If connector is OK, replace sensor. The sensor is mounted on the thermostat housing near the end of the upper radiator hose. See picks of a couple engine examples below. The part is only $11 at autozone.com, and a pic is pasted below. Let me know if you have any questions.


2.4 liter engine:

jturcotte_124.gif


3.4 liter engine:

jturcotte_125.gif

coolant temp sensor:

jturcotte_15.jpg

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1991 Honda civic 4 dr. The temp gage stays on cold all the time and the engine cooling fan never kicks on. Is there a relay somewhere for them? As soon as it gets hot the check engine light comes...


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HI Had same Problem. Found the door sensors had droped and not in correct possiation. the differance light stays out and functions properly. if the door sensors not on check degree the light stays on.

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