Electrical fan work only with AC.
08-21-2012, 08:52 AM
#1
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Year: 2001
Model: Cherokee
Engine: 4.0
Electrical fan works only with AC.
There was a thread with the same problem, but I cannot find it.
I cannot even find diagnosing procedures in FSManual.
It seems like the only coolant sensor is installed in thermostat cover and has 2 wires.
Computer turns on electrical fan, I only have temp light in instrument cluster, bulb is on in start position. I keep engine running, but fan doesn't work and light is not on.
No codes.
Haynes manual says 7 K ohms cold,
less than 1000 operating temperature
I cannot even find diagnosing procedures in FSManual.
It seems like the only coolant sensor is installed in thermostat cover and has 2 wires.
Computer turns on electrical fan, I only have temp light in instrument cluster, bulb is on in start position. I keep engine running, but fan doesn't work and light is not on.
No codes.
Haynes manual says 7 K ohms cold,
less than 1000 operating temperature
Last edited by car5car; 08-21-2012 at 11:34 AM.
08-21-2012, 09:38 AM
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Year: 1999
Model: Cherokee
Engine: 4.0
There was a thread with the same problem, but I cannot find it.
I cannot even find diagnosing procedures in FSManual.
It seems like the only coolant sensor is installed in thermostat cover and has 2 wires.
Computer turns on electrical fan, I only have temp light in instrument cluster, bulb is on in start position. I keep engine running, but fan doesn't work and light is not on.
No codes.
Haynes manual says 7 K ohms cold,
less than 1000 operating temperature
I cannot even find diagnosing procedures in FSManual.
It seems like the only coolant sensor is installed in thermostat cover and has 2 wires.
Computer turns on electrical fan, I only have temp light in instrument cluster, bulb is on in start position. I keep engine running, but fan doesn't work and light is not on.
No codes.
Haynes manual says 7 K ohms cold,
less than 1000 operating temperature
08-21-2012, 10:38 AM
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
218 is the upper coolant temp parameter set by the design engineers for when the efan turns on. Has nothing to do with Arby's drive thru.
It might have something to do with a bad/weak fan clutch, even cooling system maintenance neglect in general.
It might have something to do with a bad/weak fan clutch, even cooling system maintenance neglect in general.
Last edited by djb383; 08-21-2012 at 10:40 AM.
08-21-2012, 11:33 AM
#7
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Year: 2001
Model: Cherokee
Engine: 4.0
I used 150 Ohms resistor to check computer turning fan on.
I guess, if mechanical fan works fine, there is no need for electrical fan usually, that is why I couldn't see it working.
Well, if I decide to drive my Jeep on Everest, I'll need electrical fan.
I guess, if mechanical fan works fine, there is no need for electrical fan usually, that is why I couldn't see it working.
Well, if I decide to drive my Jeep on Everest, I'll need electrical fan.
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08-21-2012, 01:41 PM
#9
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Year: 1999
Model: Cherokee
Engine: 4.0
You should use a 450 Ohm resistor to check the fan operation. The 450 Ohm resistor will simulate approximately 230* F, well over the design setting but it's a quick check. To really check it you would need a 5K Ohm variable resistor plugged into the ECT sensor connector and while running the rsistance up monitoring a scanner to check the fan setting of the PCM.
08-21-2012, 03:30 PM
#10
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Year: 2001
Model: Cherokee
Engine: 4.0
You should use a 450 Ohm resistor to check the fan operation. The 450 Ohm resistor will simulate approximately 230* F, well over the design setting but it's a quick check. To really check it you would need a 5K Ohm variable resistor plugged into the ECT sensor connector and while running the rsistance up monitoring a scanner to check the fan setting of the PCM.
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