Heater / blower relay?
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More Turbo
Joined: Apr 2013
Posts: 661
Likes: 21
From: Waukesha WI
Heater / blower relay?
Ref. 75 F-150 with factory a.c.: I have no current to the blower motor switch. All 5 fuses have current on both sides.
I was informed that it needs a blower relay. Where is it hiding under the dash? Who sells replacements? I searched two
major Ford truck parts catalogs with no luck. I was also informed that the blower will work on HI with a worn out resistor.
I was informed that it needs a blower relay. Where is it hiding under the dash? Who sells replacements? I searched two
major Ford truck parts catalogs with no luck. I was also informed that the blower will work on HI with a worn out resistor.
Cargo Master
Joined: Jan 2019
Posts: 2,766
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From: Mississippi
You should be able to go to your "user control panel" and in the upper right hand corner area, there is a bar you can click that will show you all your subscribed threads.
Click that and go down to the title of your previous thread.
Click that and go down to the title of your previous thread.
Laughing Gas
Joined: Sep 2013
Posts: 1,113
Likes: 102
From: North Idaho
Any chance the rest of us could get the link?
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More Turbo
Joined: Apr 2013
Posts: 661
Likes: 21
From: Waukesha WI
Hi,
The switch is new. I have an ice-pick circuit tester. It has a light bulb in the handle. No juice to the switch. If you sent a picture, it did not show up on the screen.
It appears as modern art. Where is the relay hiding under the dash?
Regards,
John
The switch is new. I have an ice-pick circuit tester. It has a light bulb in the handle. No juice to the switch. If you sent a picture, it did not show up on the screen.
It appears as modern art. Where is the relay hiding under the dash?
Regards,
John
Ford Parts Specialist
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From: Simi Valley, CA
1973/79 F100/350 & 1978/79 Bronco with factory installed integral A/C or Hi/Lo Comfort Vent System.
NOS PARTS LTD in Waxahachie TX has 3 = 972-937-2201.
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Post Fiend
Joined: Feb 2008
Posts: 5,831
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From: St Albert, Alberta
Ref. 75 F-150 with factory a.c.: I have no current to the blower motor switch. All 5 fuses have current on both sides.
I was informed that it needs a blower relay. Where is it hiding under the dash? Who sells replacements? I searched two
major Ford truck parts catalogs with no luck. I was also informed that the blower will work on HI with a worn out resistor.
I was informed that it needs a blower relay. Where is it hiding under the dash? Who sells replacements? I searched two
major Ford truck parts catalogs with no luck. I was also informed that the blower will work on HI with a worn out resistor.
Put the mix lever in defrost and check for power at the blower motor connector. No power there is an issue on the feed circuit. With the fan setting on high check for continuity to ground at the blower motor no ground there is an issue in the speed control side.
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More Turbo
Joined: Apr 2013
Posts: 661
Likes: 21
From: Waukesha WI
Where is the blower motor resistor? If it's fried, I can see it. My MAC parts book does not list a relay. The wires to the switch are all dead. It's getting cold out.
I survived the summer without the a.c. Stella goes into her long winter nap in mid November.
I survived the summer without the a.c. Stella goes into her long winter nap in mid November.
Post Fiend
Joined: Feb 2008
Posts: 5,831
Likes: 121
From: St Albert, Alberta
Just to clarify there is no power to the fan speed switch, it goes to ground the fan speed switch is on the ground side of the heater motor. ON high the fan speed switch bypasses the resistor pack altogether. So as long as the heater blower motor has power it should run with the heater fan speed switch in the high setting.
The resistor pack is in the heater plenum, see below circled in red.
Post Fiend
Joined: Feb 2008
Posts: 5,831
Likes: 121
From: St Albert, Alberta
Well first off it is not under hood, but under the dash
Below is the Factory AC location. Again circled..
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