jeep radiator fan !
CF Veteran
Joined: Jun 2010
Posts: 1,378
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From: Hayward, CA
Year: 1996
Model: Cherokee
does it come on when you turn the AC on? if not, couple options:
1) blown fuse to the fan, verify by turning AC on and checking for lack of power at the fan plug
2) bad fan, verify same way as 1 but would HAVE power to plug
3) somehow developed a short in the wiring. check for continuity between positive side of fan plug and ground
4) solve issue that you find (bad fuse, bad relay, bad fan, short in wiring, etc...)
5) profit?
1) blown fuse to the fan, verify by turning AC on and checking for lack of power at the fan plug
2) bad fan, verify same way as 1 but would HAVE power to plug
3) somehow developed a short in the wiring. check for continuity between positive side of fan plug and ground
4) solve issue that you find (bad fuse, bad relay, bad fan, short in wiring, etc...)
5) profit?
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Seasoned Member
Joined: Sep 2010
Posts: 331
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From: Parma Ohio
Year: 1998
Model: Cherokee
Engine: 4.0
If your ac doesn't work, the fan might not come on tho..(I know when testing my ac compressor for my oba build it won't come on with the ac on because of system pressures) If you really want fan control on demand just wire it up on a switch 
CF Veteran
Joined: Mar 2010
Posts: 47,923
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From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
CF Veteran
Joined: Jun 2010
Posts: 1,378
Likes: 0
From: Hayward, CA
Year: 1996
Model: Cherokee
CF Veteran
Joined: Jan 2011
Posts: 1,894
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From: Las Vegas
Year: 1999
Model: Cherokee
Engine: 4.0
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Joined: Jul 2009
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From: West Deptford, NJ
Year: 97
Model: Cherokee
Engine: 4.0
CF Veteran
Joined: Jan 2011
Posts: 1,894
Likes: 4
From: Las Vegas
Year: 1999
Model: Cherokee
Engine: 4.0
, but it does come on after the motor warmed up.What should be the first think to check?
Sorry for the hijack OP.
This is what i just found out...
1997-2001 the e-fan is triggered by the single Coolant Temperature Sensor on the thermostat housing. The PCM controls the e-fan. 97-99 the e-fan should cycle with the A/C engaged, but maybe only with warmer outdoor temps. 00-01 only cycles the e-fan when engine temps reach 215*, A/C or not. Inspect the wires and wire plugs for the e-fan.
The A/C should cycle unless it is low on R-134a or you have other issues like a bad compressor clutch or failed pressure switches.
The Blower Motor Resistor controls the interior climate control fan. They commonly blow out and one or all of the fan speeds are lost until it is replaced. Check the wires and wire plugs for damage also.
The A/C should cycle unless it is low on R-134a or you have other issues like a bad compressor clutch or failed pressure switches.
The Blower Motor Resistor controls the interior climate control fan. They commonly blow out and one or all of the fan speeds are lost until it is replaced. Check the wires and wire plugs for damage also.
Last edited by BotakBeng; May 26, 2011 at 09:22 PM.