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Thread Tools | Display Modes |
07-16-2025, 10:44 AM
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#1 |
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Registered User
Join Date: Dec 2017
Location: Missouri
Posts: 332
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What year is this AC system
My truck is a 77, but this may be a 78 or newer style. Anyone know for sure? Thanks!
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07-16-2025, 12:33 PM
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#2 |
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Registered User
Join Date: Dec 2014
Location: Euless, Texas
Posts: 539
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Re: What year is this AC system
That looks like my 74 C10. Possibly several years were similar.
__________________
1974 Cheyenne 10 LWB Stock 350 W/HEI /TH350/AC/4 BBL Quadrajet Mopar by Birth Chevy by Choice |
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07-16-2025, 05:06 PM
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#3 |
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Registered User
Join Date: Dec 2017
Location: Missouri
Posts: 332
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Re: What year is this AC system
Supposedly the wiring changed sometime around 77 -78, I'd like to order a new harness and want to make sure I get the right one. Thanks for the info.
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07-17-2025, 01:32 PM
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#4 |
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Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,809
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Re: What year is this AC system
The plumbing looks like my 75. Not sure about the electrical gizmo just under the blue sticker. Did someone move the 'too cold' pipe sensor from the normal location to there?
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07-17-2025, 02:12 PM
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#5 |
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Registered User
Join Date: Dec 2017
Location: Missouri
Posts: 332
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Re: What year is this AC system
Not sure what if anything was changed, my truck is a 77, but has a 78 AC cab, the AC harness has been cut/spliced, trying to figure out which harness to order a 77 or 78? They have different parts #'s in the Lectric Limited catalog. From the catalog 1978 AC harness -2nd design: air conditioning thermostatic switch mounts to evaporator near receiver/accumulator.
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07-17-2025, 06:11 PM
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#6 |
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Robert Olson Transport
 
Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,394
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Re: What year is this AC system
usually the compressor is long cylinder on older ones the newer is the thinner one
__________________
Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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07-17-2025, 08:15 PM
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#7 |
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Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,809
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Re: What year is this AC system
A pic of the wiring on my 75. Top is the fan relay. Under that is the thermostat cold cut off. To the right side is the high pressure switch.
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07-17-2025, 08:52 PM
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#8 |
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Registered User
Join Date: Jul 2005
Location: CT
Posts: 289
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Re: What year is this AC system
Looks like the thermostatic switch is on the low side line. Hard to tell from your pix.
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07-17-2025, 09:36 PM
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#9 |
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Registered User
Join Date: Dec 2017
Location: Missouri
Posts: 332
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Re: What year is this AC system
Here's a few more.
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07-22-2025, 08:24 PM
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#10 |
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Registered User
Join Date: Jul 2005
Location: CT
Posts: 289
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Re: What year is this AC system
Some butchery going on there
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07-22-2025, 09:16 PM
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#11 |
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Registered User
Join Date: Dec 2017
Location: Missouri
Posts: 332
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Re: What year is this AC system
Yes, most of the truck was cobbled when I bought it, just about got it like it should be, but the AC is a guessing game. I'm going to pull the evaporator soon and see what part # it has on it. that may help me determine what year it is.
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07-25-2025, 08:54 PM
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#12 |
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Registered User
Join Date: Dec 2017
Location: Missouri
Posts: 332
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Re: What year is this AC system
Anyone know if the 1978 1st design and 1978 2nd design AC systems use the same dash controls? Maybe the only difference in wiring is under the hood? If so, I'll change everything over to one or the other designs.
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