A/C fan speed is not consistent
Thread Starter
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More Turbo
Joined: Jun 2016
Posts: 739
Likes: 110
From: South Florida
A/C fan speed is not consistent
Hey guys. Truck is a 2016 F-250 Lariat CCSB 6.2 4x4. Had my A/C on today like any other summer day and I noticed the fan speed was inconsistent at the lower speeds. It would speed up and slow down all on its own. If I set it to blow at full speed or one setting below full speed the problem went away however any speed setting below that and the fan would alternate the speed all by itself.
Any ideas?
Any ideas?
Post Fiend
Joined: Nov 2001
Posts: 6,748
Likes: 118
From: Tallassee, ALabama
When the HVAC is in the Auto mode, the speed can vary. I think there are other times the speed can increase or decrease depending on the OAT. The fan speed is controlled by an FET controller located on the bak side of the HVAC box. The dash would need to be removed to change it.
Thread Starter
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More Turbo
Joined: Jun 2016
Posts: 739
Likes: 110
From: South Florida
When the HVAC is in the Auto mode, the speed can vary. I think there are other times the speed can increase or decrease depending on the OAT. The fan speed is controlled by an FET controller located on the bak side of the HVAC box. The dash would need to be removed to change it.
Could I be developing a vacuum leak?
New User
Joined: Aug 2019
Posts: 2
Likes: 0
Fan. Speed variates.
Hey guys. Truck is a 2016 F-250 Lariat CCSB 6.2 4x4. Had my A/C on today like any other summer day and I noticed the fan speed was inconsistent at the lower speeds. It would speed up and slow down all on its own. If I set it to blow at full speed or one setting below full speed the problem went away however any speed setting below that and the fan would alternate the speed all by itself.
Any ideas?
Any ideas?
Post Fiend
Joined: Nov 2001
Posts: 6,748
Likes: 118
From: Tallassee, ALabama
I don't believe the fan on the 2011-2016 trucks is under the hood. I think there are 3 screws and can be removed from inside on the passenger side of the HVAC box.
New User
Joined: Aug 2019
Posts: 2
Likes: 0
[QUOTE=Rob steingraber;18817387]Yes. Had the same issue. I have a 2004 super duty. Different replacement proceedures, but look into your motor and fan. That will definatly cause the same symptoms
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Trailering
Joined: Aug 2019
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If you change your blower motor make sure to replace the blower motor resistor too! I have seen a lot of new blower motors cook from resistors.
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