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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

94 Ford Explorer, Burning Incense
Q: I have a '94 Ford Explorer and when I turn on the heater or air conditioner I sometimes get the smell of burning leaves. There have even been times when I detected a small bit of smoke coming from the vents. I do park under a large oak tree and feel that leaves may have fallen into the screen/vent which is on the hood near the windshield. Can you tell me how to check this and remove any debris that may be in this vent area? ......Jack

A: The first place to start would be with the blower motor. The opening created by removing the blower motor assembly allows for room to inspect and remove debris that may have entered the heater box. The burning smell is likely due to debris that has contacted the resistor block, which is used to control the blower motor's speed. The resistor block becomes very hot during operation and will cause the burning smells you describe if a leaf or other debris were to contact it.

 
     
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