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Posted on Jan 02, 2017
The fan is computer controlled and will not come on untill it reaches 212Deg . It should come on though if you turn on the air conditioning, if not you could have a bad fan relay or relay plug.
Posted on Feb 22, 2010
the fan not coming on unless you turn the a/c on is a clue.this tells you the fan is working but the coolant sensor for the fan operation may not have been the one you changed(as there is one for the dash gage/light and one for the computer to turn on the fan).also the fan relay may be the problem not turning the fan on without the a/c on.
Posted on Jun 21, 2011
i would suggest you get the head gasket checked you can get a kit from motor factors which does gas test in header tank if blue liquid changes colour to brown you need to replace head gasket
Posted on Oct 16, 2011
Yes - you diagnosed the problem yourself. The classic symptom of a heater that only blows on the "High" setting is a burned out/damaged or otherwise inoperative blower resistor.
Replacing the resistor should return the two missing blower fan speeds.
Posted on Dec 05, 2011
There are many things that can cause your radiator fans to not get power. However, the most common cause is the fan control module. Some people call it a "fan control relay", (including many aftermarket parts retailers) but it is actually a solid state control module, not a relay.
Check for power in and out of the module. It is best if you have access to a scan tool that has system test capabilities so you can command the fans to turn on with the computer. Otherwise, you will have to get your engine really hot and see if the power is being sent from the control module to the fan motors.
The fan control module is located on the inside of the left frame rail (driver's side) just behind the radiator. You will have to get under the vehicle to see it. It looks like the picture below.
Posted on May 04, 2012
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