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  #1  
Old August 25th, 2019, 21:03
vimoto vimoto is offline
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electric fan is always on!!!!

my xj 2001 fan is always on even on mornings on cold start, temp sensor is new, tjermostat new fan relay new. any ideas? temp gauge is up and down most of the time is down to 0 after 30 or 40 mins of driving
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Old August 26th, 2019, 07:31
RCP Phx RCP Phx is offline
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Re: electric fan is always on!!!!

Well both the fan and gauge are controlled by the PCM. I would check for good grounding before anything else.
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Old August 26th, 2019, 08:43
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Tim_MN Tim_MN is offline
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Re: electric fan is always on!!!!

Quote:
Originally Posted by vimoto View Post
. temp gauge is up and down most of the time is down to 0 after 30 or 40 mins of driving
Explain this more completely, the temperature gauge should show about 195*-210 after the engine is warmed up.


Is the Check Engine Light ON ?

Disconnecting the Coolant Temperature Sensor (CTS) makes the PCM turn the e-fan as a fail-safe. I would suspect a faulty CTS, a faulty e-fan relay, or faulty wiring related to the CTS, fan relay, or e-fan.
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Old August 26th, 2019, 09:33
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Saudade Saudade is offline
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Re: electric fan is always on!!!!

Is this a new to you XJ or did you do some other work on it and then this started?
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Old August 26th, 2019, 14:07
alwayzAMC alwayzAMC is offline
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Re: electric fan is always on!!!!

also check to make sure you don't have the A/C on, the fan will come on if the AC is on, i don't have a working AC to test if it stays on reguardless of engine temp though. iirc the A/C is on when defrost is selected too in the 00/01
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Old August 26th, 2019, 16:11
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Tim_MN Tim_MN is offline
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Re: electric fan is always on!!!!

2000/01 the e-fan only turns ON when required, ( a/c or defrost on or off ). 1997-99 the e-fan cycles on/off when a/c or defrost is on. The e-fan always on strongly suggests a faulty CTS, a faulty e-fan relay, or faulty wiring related to the CTS, fan relay, or e-fan
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