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Old Nov 4, 2014 | 10:21 AM
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Zachthemoo2's Avatar
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Heater switch

The heater switch on my 77' f250 only turns on when I put it to full blast. It does work on full blast, but it is just annoying that it is not fully functional. Any ideas on why this is?
 
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Old Nov 4, 2014 | 11:09 AM
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From: Chillicothe, IA
easiest way to help you is to provide a link.

https://www.ford-trucks.com/forums/1...-a-switch.html
 
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Old Nov 4, 2014 | 06:30 PM
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Originally Posted by Zachthemoo2
The heater switch on my 77' f250 only turns on when I put it to full blast. It does work on full blast, but it is just annoying that it is not fully functional. Any ideas on why this is?
The blower resistor is bad.
High speed on the blower bypasses the resistor.
 
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Old Nov 5, 2014 | 07:38 PM
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Originally Posted by mikeo0o0o0
The blower resistor is bad.
High speed on the blower bypasses the resistor.
Resistor assy., heater switch to blower motor
Fits: 73-up F100-350

C9AZ-18591-A

Wesley Obsolete Parts, Liberty, KY has 12 ((606) 787-5293
Dennis Carpenter, Concord, NC has 1 (704) 786-8139
The Lincoln-Mercury Old Parts Store, Clearwater, FL has 1 (727) 445-7551
 
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Old Nov 5, 2014 | 07:53 PM
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Originally Posted by mikeo0o0o0
Resistor assy., heater switch to blower motor
Fits: 73-up F100-350 / C9AZ-18591-A
E3TZ-18591-A (replaced C9AZ-18591-A) .. Blower Motor Resistor-Use with heater or dealer installed A/C only. Not used with factory installed integral A/C / Available from Ford.

Applications: 1973/86 F100/350 / 1975/87 Econoline / 1978/86 Bronco // 1969/72 Galaxie/LTD.

MSRP: $31.72 / FTE sponsor horizonpartsguy.com price: $22.84 / Horizon Ford - Seattle (Tukwila) WA

Mike: OP lives in WA
 
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Old Nov 5, 2014 | 08:02 PM
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Thanks for the updated info, Bill.
 
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