-Clean Evaporator coil - All Servos work properly - Blower motor sounds fast - All Fan speeds work - No blockages in ducts - Mode button moves all servos correctly.
I did notice something odd, when I select front vents and normal a/c those two buttons light up. If I choose forward vents, max air, recirculate, the a/c button stays on and the vent light goes out. But the mode button works as it should it just don't stay lit with max air on.
What makes this problem better or worse?
nothing
How long has your 2013 Ford F-250 Super Duty had this problem?
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Maximum a/c setting is *recirculate mode* - vent is turned off by default .. It’s in the manual..
Rodent nest or other foreign material in blower motor ‘fan wheel’ is also a possibility.
Good luck!
Is your air conditioning compressor possibly staying on too long icing over the evaporator core? That can cause the sound of a fan at full speed with poor air flow.
https://justgivemethedamnmanual.com/ford/2013-ford-f-250-owners-manual/
Maximum a/c setting is *recirculate mode* - vent is turned off by default .. It’s in the manual.. Rodent nest or other foreign material in blower motor ‘fan wheel’ is also a possibility. Good luck!