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Old 10-08-2010, 07:16 AM   #1
Number21
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Did my truck have factory AC or not?

I recently got a 1973 K20 as a gift and and I heard second hand from the last owner that it had factory AC, although the compressor is missing as the engine has been replaced. I believed this because, well, I have AC controls in the dash. There are also some heavy hoses under the dash that are cut off, for AC or...?

On the other hand I know the firewall is different in factory AC trucks and I just noticed tonight that my '73 looks exactly the same as my non-AC '79. I also don't have the vents in the dash, but the pad has been replaced so I don't know if there was? So now I'm wondering if the '73 actually had factory AC? Can I tell by looking at the firewall?

I want AC, but only if my truck originally had it. I'll try to take some pics in the morning...

Last edited by Number21; 10-08-2010 at 07:18 AM.
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Old 10-08-2010, 09:13 AM   #2
N2TRUX
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Re: Did my truck have factory AC or not?

Non a/c trucks will have a small heater box on the firewall. Factory a/c box will be much larger.
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Old 10-08-2010, 09:24 AM   #3
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Re: Did my truck have factory AC or not?

That's one way to tell, but do you have the spid possibly or the original sales papers? That would be a great way to tell.
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Old 10-09-2010, 01:57 AM   #4
Number21
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Re: Did my truck have factory AC or not?

Unfortunately I don't have any of the original papers. I want to order one of those information packets from GM.

I take it this isn't a factory '73 AC firewall?


Although I have this inside...


And I have no idea what the hell this is for...
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Old 10-09-2010, 02:06 AM   #5
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Re: Did my truck have factory AC or not?

that's aftermarket!
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Old 10-09-2010, 02:09 AM   #6
flamingbig10
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Re: Did my truck have factory AC or not?

You had dealer added or after market air. The firewall is the non a/c version
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Old 10-09-2010, 09:44 AM   #7
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Re: Did my truck have factory AC or not?

don't think i've seen that before,
but up here by the time i would get that put in it would be cold again lol
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