Question about 2002 Ford F150 Regular Cab

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Heater fan only works on high. what are the possibilities for repair?

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  • Ford Master
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The resistor is probably rusted out. It's easily found and inspected under the dash on the passenger side. You might also need a new wire connector/harness. I actually started losing the lower speeds until only High was left. Strangely, the best price for the resistor was the Ford dealer. I recall it was about $30-40(?) Here are pictures from my 1999 F150:


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Posted on Jul 14, 2010

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2 Answers

Heater fan works on high and nothing else. Would it be the fan or the switch?


its possible to be both , but check the heater relay switch first , and the heater resistor ,not knowing what you have -year -make -model motor size, that's the best any of us here can do.

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A multimeter would be handy to isolate the source of the problem.

With your headlights on and shining on a vertical flat surface, try noticing if they dim very briefly when you quickly turn the blower on.
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No Heat, fan works engine is at temp.


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You have 2 possibilities. One is that water valve is not opening and the heater core is cold, the second possibility is that the heater core is hot and the ductwork under the dash is not switching the flaps to give heat.

If both heater hoses are hot it means the heater core is hot and the interior ductwork is not channeling heat. You would then need to replace a movement valve or motor to switch the flaps in the ductwork.

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1 Answer

My heater won't blow out any air unless it is on high with the fan blowing.


Hello let me verify.
1 heater wont blow out warm air unless on high?
possible clogged airfilter.low on coolant or antifreeze.

2 heater wont blow any air unless on high?
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Hello,
If you are refering to the fan it could be the fuse or the fan resistor or the fan motor or the high blow relay or the wiring in that order of possible causes.

I hope this helps.

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