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Old 03-15-2008, 08:30 PM   #1
MikeB
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66 C10 wiring with factory AC

Can someone post a wiring diagram for a 66 C10 with factory A/C? I'm only interested the heater and A/C wiring. The A/C doesn't work (no compressor or lines) but I'm trying to figure out how to control the heater fan speeds. (Are there 2 or 3 speeds?)

Also, I'd appreciate any info on dropping the under-dash plenum so I can get to the holes in the firewall to run a new wiring harness into the engine compartment.

Wiring behind and under the glovebox

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Mike
1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

Last edited by MikeB; 03-15-2008 at 09:09 PM.
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Old 03-16-2008, 05:33 AM   #2
PrerunnerRob
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Re: 66 C10 wiring with factory AC

I want to say I have one of these diagrams somewhere, but I can't find it.
I did however find this, if it is any help
http://67-72chevytrucks.com/vboard/s...d.php?t=193429
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Old 03-17-2008, 08:41 PM   #3
MikeB
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Re: 66 C10 wiring with factory AC

Thanks for the link. I just PM'ed rodnok1 and asked him for the full size diagrams.

Mike
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Mike
1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
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Old 03-20-2008, 06:17 AM   #4
MikeB
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Re: 66 C10 wiring with factory AC

Found a 69 AC/heater wiring diagram. It's not exactly the same, but close enough that I now understand what all the parts are and how they are wired. Also have a 66 wiring diagram on the way to me from H&H Classics.

Thanks for your help.
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Mike
1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
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