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sprinkles08
sprinkles08, Chrysler/Dodge/Jeep master tech
Category: Dodge
Satisfied Customers: 21586
Experience:  ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans and Hybrid Specialist
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2002 Durango: Heater fan motor doesnt engage..dashboard..troubleshoot

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2002 Durango. Heater fan motor doesn't engage - fuse checks out - minor noise behind dashboard when switching speed of fan and then after 2 or 3 seconds all is quite. Anyone have any ideas as to how to troubleshoot? On a possible related issue, I have noticed that when the heater is in defrost mode the electric coolant fan on the radiator stays on no matter what external or engine ambient temperature - when I switch to floor/interior heat the coolant fan switches off.

Hello and welcome to JustAnswer!

 

What you've seen with the cooling fan under the hood is normal. When you run any mix of defrost it runs the a/c compressor to dry the air, so the cooling fan under the hood will be running.

 

Your blower motor not running could be caused by a few things. The blower motor, ignition switch, wiring, or resistor are all the most common things. The most common and likely out of these would be the blower motor resistor. This is mounted to the bottom of the heater box on the passenger side with two 8mm screws. It's job is to step down the available current to the blower motor to give you the different speeds. When the resistor fails the most common symptoms are the blower motor only working on high or not working at all.

 

The resistor is cheap, easy to test and replace. If you have a voltmeter you can unplug the resistor and check for continuity between all terminals of the resistor. If you find any with an open circuit it's bad for sure. Beyond that you could do some basic testing with a meter or test light to make sure it's bad before replacing it.

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