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#1 |
Registered User
Join Date: Jan 2018
Location: BRIGHAM CITY, UT
Posts: 2
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Heating wiring question
Hey guys, brand new to the forum. I've read many threads but can't seem to find what I'm looking for. Hoping someone can help me out.
I have a 79 K10 with a new 3 speed heater only fan selector. I recently swapped out the heater only box with an ac/heater box that someone donated. I don't care about the ac right now but only want the heater and defroster to work right now. Here's the problem I have... the fan selector is 3 wire and the resistor is 4 wire. First of all is this even possible to use the non a/c selector switch? I don't want to have to buy another new switch just yet unless I know for sure I will want ac in the future. Currently, I only have the blower motor working when the key is on and the selector switch is on hi. There is nothing on the 1st two speeds. Any help is appreciated. |
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#2 |
Registered User
Join Date: Dec 2014
Location: Euless, Texas
Posts: 512
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Re: Heating wiring question
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1974 Cheyenne 10 LWB Stock 350 W/HEI /TH350/AC/4 BBL Quadrajet Mopar by Birth Chevy by Choice |
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#3 |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,954
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Re: Heating wiring question
You can run the non AC resistor and heater control with the heater sub-harness.
AC uses a relay to run the blower at full speed without melting the switch. You'll need to retrofit the AC wiring and relay along with the AC controls. How are you handling the firewall ducting differences?
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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#4 |
Registered User
Join Date: Jan 2018
Location: BRIGHAM CITY, UT
Posts: 2
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Re: Heating wiring question
Thanks for your response Hatzie!
That might be a hurdle I have yet to come to. I got the switch to operate correctly. Turn the key on, the blower motor comes on. I also got the blower motor to increase with the selector switch fan speeds respectively. I'm not using the number 4 connector on the resistor. I have hot air but I'm concerned the resistor might heat up to much. Is that possible? |
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#5 |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,954
|
Re: Heating wiring question
You should have airflow over it with the blower on. Not sure whether you'll get in trouble without...
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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Tags |
air conditioning, blower motor, heater, resistor, wiring |
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