Question about Cars & Trucks
The radiator cooling fan works sporadically, sometimes it turns on but turns very slowly/weak, other times not at all. If I 'jumps tart' the fan by pushing it with my finger it starts turning, but slows down and stops. While it is turning, the air strength is very weak. At a stop light the A/C gets warm too. Is the fan's strength and speed controlled by the temperature sensor? As a test, I unplugged it and used a 12V motorcycle battery to test it and it turned very strongly and fast.
Posted by Anonymous on
Hi, I believe it could be a bad temp sensor. Which turns the fan on or off. Have it checked. Replace it with new one. Hope that helps you.
Posted on May 25, 2017
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Posted on Jan 02, 2017
this not really a problem as the fan speed is controlled by the high preasure switch in the ac system the hotter it is outside the higher the preassure will be in the system as hot as its been the preasure is high already when the compressor cycles it pulls suction on one side and outputs high preasure on the other the fans cool the condenser the higher the ambient temp the faster they go so all is fine...
Posted on Jun 09, 2008
the aux fan only works when the ac is on, and has come to a predetermined temp(?) i found this out while going up a long grade in the back country without the ac on and later found out the radiator was half plugged!
Posted on Nov 22, 2008
yes make sure all the wires are off the blower motor and jump it to give it 12 volts if the blower works the problem is else ware. get back to me if you need more help,please don't leave bad rating get back to me and we'll go from there
Posted on May 15, 2009
SOURCE: cooling system purge info
The biggist problem is most likely the cooling system needs bleeding to purge the air out of the cooling system.To do this,the easy way,is to start this with the car cold.Remove the reservoir cap and fill it full,past the full mark.Wait to see if the coolant level drops.Then refill to the top.Replace the cap,and start the engine,and let it run up to about 218 to 220,and shut the engine off(do not turn ac on,make sure it is off).Wait about 45 minutes,and look at the reservoir level,it should have dropped.If so refill the reservoir,and repeat these steps until the cooling fans come on at about 215 or so,and they go back off by themselves.Keep check on the reservoir for a day or so to make sure that the reservoir does not drop to low,the level will finally set.If I can help,let me know.>>>firstname.lastname@example.org
Posted on Sep 24, 2009
Testimonial: "thanks for your help! two brass screws 7mm the location of bleeders do you have any idea"
You are off to a good start by testing the fans. Get a repair manual from your nearest autoparts store. I find them invaluable. Most temperature sensors can be tested with an Ohm meter. Or short the two wires together to trigger fans. If it has only one wire then ground it to the frame/body (negative side of battery). If none of that works (with ignition on / car off) then relay is bad. Also turning on the A/C should make the fans come on. Car does not have to be running, key in on position. This would eliminate bad relays or not.
Posted on Mar 04, 2010
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