Fan speed switch problem...
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Junior User
Joined: Feb 2006
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Fan speed switch problem...
1994 e-150 van and the interior fan speed switch only works on HIGH. I remember a thread about a open resistor in the ac / heater box and it was available from Autozone but my search came up empty. Plus AZ counter guys are useless.....
Posting Guru
Joined: Feb 2007
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Why speculate whether its the "Fan speed switch" or blower motor resistor, when it's so easy to pull/test the resistor?
You can confirm/eliminate the resistor quicker than you can boot up computer & post the Q on FTE.
If not resistor it's a good bet the switch is at fault, but some are discouraged from venturing behind the dash panel b/c of Fear of Spaghetti.
Both switch & resistor are an "easy find at the wrecking yard" but going to a Self Serve wrecking yard may be more satisfying.
You can confirm/eliminate the resistor quicker than you can boot up computer & post the Q on FTE.
If not resistor it's a good bet the switch is at fault, but some are discouraged from venturing behind the dash panel b/c of Fear of Spaghetti.
Both switch & resistor are an "easy find at the wrecking yard" but going to a Self Serve wrecking yard may be more satisfying.
Fleet Owner
Joined: Aug 2010
Posts: 21,254
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From: Reynoldsburg, Ohio
Typically Jamnjm if you have any fan operation at all the dash switch can be considered good---at least for the moment. I've had two of them over heat and melt to the point they stop working but that's not too common a problem. Chances are it is your resistor bridge. NAPA or a better parts outlet---even RockAuto.com or the stealership tend to have more knowledgeable staff as well.
Here's an image that might help you locate this part if you don't already know:
HTH
Here's an image that might help you locate this part if you don't already know:
HTH
New User
Joined: Jan 2012
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I have a 99 ford f350 the heater only works on high
I have replace the resistor twice and replaced the fan control switch
can,t figure out why the resistor keep going out
I have replace the resistor twice and replaced the fan control switch
can,t figure out why the resistor keep going out
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Fleet Owner
Joined: Aug 2010
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From: Reynoldsburg, Ohio
When changing the switch or the resistor do you notice any signs of excessive heat due high amp draw? My '00 E250 lost all but the high fan setting and there was a faint odor of melted plastic too. I discovered the switch had melted internally and its wire harness connector also deformed. Luckily both were available from NAPA and somewhat of an easy installation.
Its highly unusual to go through two switches and resistors so quickly---has to be something else causing this.
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