electric fan is always on!!!!

V

vimoto

NAXJA Forum User

Location

Mexico

• Aug 26, 2019

• #1

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

 

R

RCP Phx

NAXJA Forum User

Location

Phoenix,Az

• Aug 26, 2019

• #2

Well both the fan and gauge are controlled by the PCM. I would check for good grounding before anything else.

 

Tim_MN

Freakish Hand Strength

NAXJA Member

Location

Minneapolis, MN

• Aug 26, 2019

• #3

vimoto said:

…. temp gauge is up and down most of the time is down to 0 after 30 or 40 mins of driving

Click to expand...

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.

 

Saudade

NAXJA Member

NAXJA Member

Location

SoCal

• Aug 26, 2019

• #4

Is this a new to you XJ or did you do some other work on it and then this started?

 

A

alwayzAMC

NAXJA Forum User

Location

maine

• Aug 26, 2019

• #5

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

 

Tim_MN

Freakish Hand Strength

NAXJA Member

Location

Minneapolis, MN

• Aug 26, 2019

• #6

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