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Im working on a 1999 Toyota carry 4-cylinder engine. Both fans run constantly regardless of whether the engine is running or not. Even when the engine is cold from sitting. Already checked the relays and sensors and they're good. Been racking my brains over this all week

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  • Cars & Trucks Master
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Do you have any system fault codes?

Posted on May 08, 2013

  • 2 more comments 
  • Evan Escobar May 09, 2013

    Unfortunately no. My OBD-2 hasn't given me any faults to look into . The car runs great, doesn't run hot or anything, just runs both fans at all times.

  • Evan Escobar May 09, 2013

    Unfortunately no. My OBD-2 hasn't given me any faults to look into . The car runs great, doesn't run hot or anything, just runs both fans at all times.

  • Evan Escobar May 09, 2013

    Think i figured it out. Forsome reason the primary fan relay isn't grounded...
    I forgot to mention the car has been wrecked previously. Whoever fixed it before is a damn moron. Should be an easy fix

  • yadayada
    yadayada May 09, 2013

    The fan relay is gounded by the powertrain control module when the ECT sensor indicates the correct temerature the fan is switched on via the ground..



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SOURCE: cooling fan not working

The fans only run when the engine reaches approxminatly 235 degrees F. on the guage that is near the end of scale just before guage show "HOT" I don't think you have a problem, allot of folks out there don't know about this.

Posted on Aug 22, 2008

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SOURCE: fans run constantly

Irwinr12 is right, no amount of fan will keep the Regal from warming up if the thermostat is working properly, Replace it. Clear SES light with OBDII tool & you should be good to go. BTY its the car computer that keeps the fans running, and they will continue to run until you clear the code. Any kind of cooling/overheating proiblem will kick in the SES light and set both fans running. I own '01 GS, my son has '03 GS and we have both complete set of service manuals. Trust me, do what I say. Batman

Posted on Mar 11, 2009

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SOURCE: 1995 Toyota Camry 4 cylinder runs hot


Firstly, ensure you have the required 'mixture' of coolant/water (must have required coolant).

Second, I would recommend you re-test all the cooling system sensors again (make sure they're within specifications), in case a new one is faulty.

Third, ensure the new thermostat was of the correct temp setting (they all differ), so that it opens at the required time. Most cooling systems operate within 90 - 100degC.

Fourth, make sure the radiator (and associated hoses) aren't blocked.

If your temp gauge is reading higher than normal, but NOT in the danger zone...then this can be considered normal (especially if you've replaced with new components) and nothing to be concerned about.

However, if the temp gauge IS in the danger zone....then this suggests the coolant is not flowing through the cooling system properly.

If all above components test ok, then it's possible your water pump may not be pumping enough volume.


Posted on Aug 16, 2009

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SOURCE: 1996 Toyota Tacoma wont start when the engine is hot and sits a few minutes

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The answer (above) came from this link and was posted by joe the mechanic on this thread

Posted on Jul 20, 2010

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1 Answer

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