Cooling fan runs at startup

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10-08-2010, 10:14 AM

pmichel

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Location: NW Oregon

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Year: 1993

Model: Cherokee

Engine: 4.0 HO

Cooling fan runs at startup

93 XJ 4.0

Cooling fan turns on at startup and runs for about 30 seconds every 3-4 mins. I changed the water temp sensor, still does it. Any ideas guys? Thanks for your help.

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10-08-2010, 10:23 AM

TrekkerJmm

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Year: 1994

Model: Cherokee

Engine: l6 HO

Welcome to CF from Tj... do you have the defroster or AC on because if they are on the fan will run...Tj

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10-08-2010, 01:41 PM

pumba1239

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Year: 1994

Model: Cherokee

Engine: 4.0l

I had this same issue only it ran all the time, replace the thermostat I did on mine and it fixed it, when thermostats fail they are designed to fail open.

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10-08-2010, 01:54 PM

rich

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Year: 2000 @ 1994 givin away

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by pumba1239

I had this same issue only it ran all the time, replace the thermostat I did on mine and it fixed it, when thermostats fail they are designed to fail open.

What!!!!! no they aren't !!!!!,The only ones like that are the-stat fail safe ts Not the regular t-stats.Please make sure the info you give is right or if your not sure its better to say nothing.