AC works only on the highest setting
#11
1st try at this so hope it works. 2011 F150 eco boost with dual zone climate control. AC only blows on high , max AC fan speed will not adjust - only high . Replaced the blower motor resistor , new one works intermittently , on off, on off continuously . I have seen similar issues that pointed to the resistor , but not exactly the same . Possibly a relay or the motor?