79 heater issues
Post Fiend
Joined: Apr 2008
Posts: 5,338
Likes: 3
From: Grants Pass, Oregon
That noise would suggest it was on its way out before anyway......it may have been binding, or loose and a hard impact could have caused it to seize up, which would have caused the fuse to blow
Post Fiend
Joined: Apr 2008
Posts: 5,338
Likes: 3
From: Grants Pass, Oregon
Im anxious to hear what you find out for my own personal reasons......of my three old Fords, one has a noisy heater fan, one has a bypassed heater core....so soon im probably gonna need to do much of what your gonna do!
Thread Starter
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Senior User
Joined: Jan 2014
Posts: 109
Likes: 0
Probly dont need to but i am just cause i bought the truck a few months back and so far everyrhing is a mess. The wiring is all screwed up. So im gonna do some wiring and im gonna pull a whole new motor and vents and make sure its all done right.
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,148
Likes: 5,783
From: S/W Missouri, Polk county
Wow that wiring must be a real mess, its a wonder it even starts and runs.
With the instrument cluster and the glove box out you can get in there to replace the complete wiring harness.
But just get on with your bad self and take us slackers some pics, I want to see this messed up wiring that requires a dash pull. lol
Pull the dash 1st, then the heater box.
Insert sarcasm/humor in case you missed it. You know lol....
The pics are of a none a/c truck and it really only has one big wire bundle.
With the instrument cluster and the glove box out you can get in there to replace the complete wiring harness.
But just get on with your bad self and take us slackers some pics, I want to see this messed up wiring that requires a dash pull. lol
Pull the dash 1st, then the heater box.
Insert sarcasm/humor in case you missed it. You know lol....
The pics are of a none a/c truck and it really only has one big wire bundle.
Thread Starter
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Senior User
Joined: Jan 2014
Posts: 109
Likes: 0
Hey guys. Work had me for a little bit. Got to trying the jump wire to the fan this morning and fan works. Touched it for a sec and it kicked on. I was thinking maybe one of the control cables snapped?? What you guys think??
Post Fiend
Joined: Apr 2008
Posts: 5,338
Likes: 3
From: Grants Pass, Oregon
Im not sure, but i think the blower motor control( which turns fan on/off, and allows for 3 speeds, i think?) should be a standard electrical switch, maybe with a rheostat.....I believe that the two push/pull control cables control a couple things ONLY...one controls temp, by opening or closing the water valve on the heater hose, and the other switches where the air gets blown, heater, dash vents, defrost ducts.........
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Post Fiend
Joined: Apr 2008
Posts: 5,338
Likes: 3
From: Grants Pass, Oregon
in fact, the pic above seems to confirm this.....the two sliding control, push/pull levers run horizontal, while the fan motor control is vertical, and to the left.....you can see wiring coming out of the back of the switch......now with a snapped control cable, you might not get temp changes, or you wouldnt be able to switch from heater to defrost.
Post Fiend
Joined: Apr 2008
Posts: 5,338
Likes: 3
From: Grants Pass, Oregon
You should be able to take a circuit tester, make sure you have power to both sides of the fuse, then determine which wire provides power to the heater circuit( it should be ignition "On" only), then poke the other wires with the probe while running the switch through all its positions. Ideally someone else can tell you how many wires run to this switch, and which colors serve which function.......I seem to recall 3, maybe 4 wires total