Fix for high only blower issue
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5th Wheeling
Joined: Oct 2005
Posts: 41
Likes: 0
From: Louisiana
Fix for high only blower issue
Hey all, I've been around a while but usually lurk in the background. I have read many posts on the blower motors not having any other speeds other than high. Naturally, the simplest fix is to replace the resistor pack. To those who like to dig a bit more, simply remove the resistor pack from the a/c case, and using a multimeter, check for a bad diode. In every case that I have seen, its the diode that has failed. The fix is super simple and cheap, far less expensive than a new resistor pack. Upon finding the failed diode, a new one can be bought at Radio shack. Simply cut the old one out, and solder the new one in. This repair should cost you less than 2 dollars to perform. Mines working great with it's original resistor pack and a soldered in diode. Just my 2 cents worth. Any other questions, feel free to PM me or hit me up on AIM. If need be, I can give a few pics to make it simpler.
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5th Wheeling
Joined: Oct 2005
Posts: 41
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From: Louisiana
Originally Posted by superhooperduty
whats your vehicle?
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5th Wheeling
Joined: Oct 2005
Posts: 41
Likes: 0
From: Louisiana
Unfortunately, its a problem that exixts on many makes and models, not just Ford. Its old school technology that for the most part works well. Just trying to save a few people a couple of bucks and learn something too
Also, being here in Louisiana, we tend to run the a/c practically year round, so we tend to test components such as this a little bit more than people up north of us do.
Also, being here in Louisiana, we tend to run the a/c practically year round, so we tend to test components such as this a little bit more than people up north of us do.
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From: airdrie canada
Originally Posted by superhooperduty
I have a 2005 4x4 6.0psd supercab F350 long box, i didn't know the superdutys had that problem.
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Senior User
Joined: Oct 2004
Posts: 244
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From: Seminole, FL
I just had the blower on high problem on my 2006 F250 FX4 with EATC. I replaced the only diode on the board but it did not fix it. I think it may be the Darlington power transistor. Still cheap but not sure if that is it.
I had stopped at one dealer in my county and was quoted almost $90 for the blower controller. Stopped by another dealer and got the almost same part for $52...beware dealer pricing!!!
This did the trick.
I had stopped at one dealer in my county and was quoted almost $90 for the blower controller. Stopped by another dealer and got the almost same part for $52...beware dealer pricing!!!
This did the trick.
Mountain Pass
Joined: Aug 2002
Posts: 194
Likes: 0
From: White Lake
I have '05 SuperDuty. High Blower Problem popped up. I pulled the blower control unit out, and replaced the Darlington Transistor. It took about 1/2 hour. If you can do a little soldering, it's very simple to do, except for the stupid location of the bottom screw holding the unit in.
The part was 17$.
The part was 17$.
Junior User
Joined: Jan 2005
Posts: 71
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Thanks, 86EddieB. I just replaced the evaporator core and accumulator in my '99 F-250 this weekend and noted that I had the High-Only fan speed problem. i was thinking I might have to buy something expensive but decided to do a check of this forum first. I have to admit that you guys have saved me some serious money since I bought this truck back in '02. I've only had to do a couple simple jobs but it has helped my confidence immensely to be able to check here first. This is my first diesel and I still dread the very thought of having to do serious engine repair but I know I can come here for really good advice. This time, from a fellow Cajun. Thanks again.
Elder User
Joined: Jul 2003
Posts: 551
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From: SW Montana
For us non technical/without a service manual owners, where is the thermo resistor located? or the diodes? Are they under the dash on the switch, or in the engine compartment on the motor itself? Thanks for any help provided.
Elder User
Joined: Jul 2003
Posts: 551
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From: SW Montana
Thank you for the excellent photo. My truck is an "05", I assume it is similiar to the 1999-2002 you photoed? The resistor removes from the engine compartment side or from under the dash? I only ask because I read the other posts and they talk about removing it from under the dash, and that picture of the wiring harness connector is from the engine compartment, I believe. Also, where do you buy the resistor, Radio Shack? Do they have numbers for sizing or fitment?