Question about 1990 Nissan Maxima

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Fan motors neither one of the radiator fans come on let the engine idle for at least 5 min. still nothing .temp ature gaugr half way but engine smell hot help

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Check that the fans are still working .Check that the thermo switch is working.Check that you have power to the thermo switch. and if not check relay/supply of power.Unsure with your model but the thermo switches are usualy screwed into the radiator but could be mounted on the engine.You can check your fans by running a piece of wire from the positive terminal of the battery to the positive side/wire of the fans.As long as the fans are earthed as well they should work and if not then the fans will need to be replaced.

Posted on Oct 11, 2008

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Also there is a relay that operates the fan motor

In town not enough air passing through radiator allowing it to over temp.. With heater fan running acts like cooling fan keeping engine cool

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My 02 Camry v6' battery was removed for 30 min and put back on - good battery. Engine starts no problem but stalls at idle. No error code. Is a computer-code reload or IAC cleaning ? Seems the car computer...


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turn off all electrical items (AC fan, audio, lights, defogger, etc.)
Start the engine and hold it at 3,000 rpm with no load (in park or Neutral) until the radiator fan comes on or the engine coolant gauge shows normal running temp.

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Temporary overheating when idle


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I think you started out looking in the right places. Replacing the coolant, thermostat, relay and sensor are all fairly inexpensive.

I believe you either have blockage in the system (especially if you're using tapwater), or your water pump may be failing.

I would first either take it to a radiator shop and have them flush the cooling system out thoroughly, or else pick up a chemical flush kit and do it yourself. This involves more than just drain and refill.

If this doesn't work, your next step will probably be replacing the water pump. At almost 200k miles, it's probably about due anyway.

Jun 16, 2009 | 2001 Oldsmobile Alero

1 Answer

Radiator cooling fans don't turn, car heats up! Where is the switch that turns those fan on? Thanks/Bob


on most cars , there is a temp sensor screwed into the radiator. When the coolant reaches a certain temprature , the contact inside the sensor closes , and completes the circut for the fan relay.
It should have two wire terminals , pull the wires off , and jump the posts with a short piece of wire or metal. Fan should start . ( Keys must be in the run postition , or engine running when you do this. )

If the fan goes , that means the sensor is not working. If the fan does not go , than it's something else. Perhaps the relay , or the fan motor itself is no good.

If your car has A/C , the fans should turn on when the A/C is turned on.

If you start the engine cold , it should not overheat for quite a while.. If it overheats within 5 min of driving , than your thermostat is probly cooked.

Most cars cooling fans do not run most of the time , airflow through the rad while driving is enough.
The fans would only come on while siting still ( idleing ) for a while.

Good luck : let me know how it goes.

May 05, 2009 | 1995 Oldsmobile Ninety Eight

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