Question about 2002 Isuzu Rodeo

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2002 isuzu rodeo 4 cyl twin electric radiator fans when cold turn igniton on fans run on high speed , it has a brand new battery and the alternater is checked ok it will not run hot and after it runs

Electric radiator fans when cold turn igniton on fans run on high speed , it has a brand new battery and the alternater is checked ok it will not run hot and after it runs it will cycle the fans ok it will run after its cut off for a short while,,which its normal for it as from day one when we bought it,, but after it sits over night it will do this when key is turned on to start it the fans are running on high speed and will not shut off till its driven to work 10 miles after the key is cut off then its ok , then it will cycle normal again after driving it back home 10 miles just over night setting seems to cause it to do that insert key turn on in morn the fans are wide open . thats the problem. what relays do you think might be causing this or is it something else?

Posted by Tom Lowery on


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Assuming the check engine light is not on, I would want to know what the engine temp sensor is doing.
A scanner would tell you what the temp sensor is showing - if it is unplugged or there is a problem with the wiring the fans will run as a default to prevent the engine from overheating. It could be a fan relay but I doubt it. A relay usually works or not.

Posted on Sep 08, 2012

Testimonial: "ty stephen the check engine light has been on two years it now goes off when this occurs then the gas guage inside will not show any gas when like i said its driven arouind the 10 miles to work it will stop after its cut off then it will work fine , untill it sets over night it just started this and i did try one new relay to see it ,made no difference , i was told it could be the computer, not the relays as you said probably wasnt the problem, i will more than likely put it in the shop monday afternoon to leave it over night and let them hook it to what ever they do while the key is just tuirned on and both fans run on high with no air on, thank you for you help, Tom~"


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When you have no spark only it could be the ignition module. when you have no gas delivery only it could be a relay. However when both are missing. It is either your crankshaft sensor or the engine computer. Good luck. also see if the injectors are pulsing.

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