1977 F150 Ac Question?
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Junior User
Joined: Mar 2008
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From: Thomasville, Georgia
1977 F150 Ac Question?
Hi guys, I have a 1977 F150 Custom Explorer and recently my air stopped blowing. Now I don't believe it to be the control because when I move to AC the compressor kicks on and if I get to going about 55 down the road I can feel the air moving through the vents and it's still cold, but it's just the air coming through from outside. I have no idea what happened I was riding one day and it just stopped blowing. My question is, could it be the blower motor? or am i jumping the gun here? I have checked fuses and stuff and it's all in order. moved the switches back and forth to see if maybe something came loose but it never does anything. I know where the blower motor is under the hood, is there a way to test it? I am just really at a loss to how quickly it just gave out, also it may be the original motor in the truck because all the original A/c is in tact and functioned fine up until now. Any input is appreciated, thanks a lot.
Fleet Mechanic
Joined: Feb 2006
Posts: 1,776
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From: Lorain County, Ohio
Check for power and ground to the blower motor. If you have both, the motor is likely bad. If you have both, the next likely culprits are the blower resistor and the switch.
I don't recall if the resistor/switch are on the B+ or Ground side of the motor on those trucks. Generally, if there's one wire to the motor, the B+ is switched. If two wires, the Ground is switched.
It's not uncommon for an old, worn blower motor to take out the resistor pack.
I don't recall if the resistor/switch are on the B+ or Ground side of the motor on those trucks. Generally, if there's one wire to the motor, the B+ is switched. If two wires, the Ground is switched.
It's not uncommon for an old, worn blower motor to take out the resistor pack.
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Junior User
Joined: Mar 2008
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From: Thomasville, Georgia
Okay, I have another question as I have been extremely busy and not been able to get to this yet. I noticed that the heat doesn't work either. It's kind of suspicious that both would stop at the same time right? I am leaning towards the blower motor more and more but I just wanted to hear some opinions, thanks.
Fleet Mechanic
Joined: Feb 2006
Posts: 1,776
Likes: 5
From: Lorain County, Ohio
Okay, I have another question as I have been extremely busy and not been able to get to this yet. I noticed that the heat doesn't work either. It's kind of suspicious that both would stop at the same time right? I am leaning towards the blower motor more and more but I just wanted to hear some opinions, thanks.
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