Heater/AC Blower only works on high?? - Diesel Forum - TheDieselStop.com
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1999-2007 General Questions General questions related to 1999-2007 Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

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Old 10-04-2006, 09:23 PM   #1 (permalink)
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Heater/AC Blower only works on high??

I have a 2003 f-350 that the blower motor only works on high, meaning that when the selector is in any other position it does not turn on but once in high it blows on high speed. Does this mean that the selector switch is bad or is there seperate windings for each speed? Any help appreciated.
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Old 10-04-2006, 09:47 PM   #2 (permalink)
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Re: Heater/AC Blower only works on high??

broblem is most likely the blower motor resistor. it is next to the blower motor in the evaporator case under the hood. has 2 8mm screws holding it in place. ck the first and see if the plug to the resistor is burnt.you may have to change the plug also. it is a very common problem.
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Old 10-05-2006, 04:39 PM   #3 (permalink)
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Re: Heater/AC Blower only works on high??

mko3psd you were right on. I removed the resistor then ohmed it out. turned out to be what looks like a diode was open. Just decided to remove it and solder in a small copper jumper. Works like a champ.
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Old 10-06-2006, 09:22 AM   #4 (permalink)
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Re: Heater/AC Blower only works on high??

Not a diode- Its a FUSE.
Replace the resistor assy.may be playing with fire for real
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Old 11-20-2010, 04:50 PM   #5 (permalink)
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Well, i am experiencing the same problem and I have a 2006 6.0l. If someone has a picture of the exact resister that would be great. Heater blows on high only.

It started out by blowing on high no matter what I did. I could change locations that the air blew out (floor, floor /defrost, etc) and even in the "OFF" position. It would not shut off. I drove home, shut the truck off and let it sit for a while and now it just blows on high only. Heat and A/C work fine, can change locations, just cant turn down the blower.

Pictures of the resister would be great. PLEASE HELP.
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Old 11-23-2010, 01:49 PM   #6 (permalink)
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I'm having problems with my HVAC fan but my case is even more odd - it won't work on low (position 1). The fan works fine on every other speed but low. I figure it's probably the fan motor itself but wanted to see if anyone else has encountered this issue.

How much effort is it to change the HVAC fan on the SD?
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Old 11-29-2010, 12:45 PM   #7 (permalink)
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mgyip, yours isn't that odd, I've got the same issue also. I haven't gotten around to digging through that part of the truck so again to anyone that may have pics to this fuse/resistor part, please post up!
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