Air Conditioning on Big Block ‘93 Silverado

[Andrew7]

I’m looking for info on replacing/upgrading the a/c on my big block ‘93 Silverado Dually.
Any advice is appreciated on where to buy, what to get.

 

[618 Syndicate]

May wanna start off by explaining what the problem is.

 

[Andrew7]

May wanna start off by explaining what the problem is.

The a/c has not been working for years. It uses the old style refrigerant. I’m wondering if it can be updated with new parts for the refrigerant used now.

 

[618 Syndicate]

A/C R12 to R134 sucess story.....

Well at least so far..... When I bought my 90 short bed I knew the compressor had the high pressure switch broken. The guy said the AC worked. Well you can run the compressor without the switch. I did and the compressor seized. I never checked but assumed it was an 134 system but was in...

www.gmt400.com

 

[Paolo has a K1500]

1993 was a transition year for which refrigerant was used. I have heard that both r12 and r134 systems were used in 1993. I do not recall the source of this information but it could have originated from General Motors trying to use up the remaining r12 system components which is just the kind of penny-pinching economics GM has utilized over the last50-60 years.

 

[someotherguy]

1993 was a transition year for which refrigerant was used. I have heard that both r12 and r134 systems were used in 1993. I do not recall the source of this information but it could have originated from General Motors trying to use up the remaining r12 system components which is just the kind of penny-pinching economics GM has utilized over the last50-60 years.

Not saying you're wrong as neither of us have certainly seen *all* examples of 1993 GMT400 trucks, but I've never seen a 1993 with R134a. All 1994 models were R134a, though. Every 1993 I've seen/owned/worked on/heard of were all R12.

Original post is old (2021) but the info lives on.

I'll be having to deal with this sooner than later, as my 1993 has a broken electrical connection to the compressor clutch and the entire system is an unknown as I bought the truck this way. Hate to spend $100 on a new clutch just to find out the compressor might be bad, but I also don't want to spend more on a new compressor if I just needed to replace the clutch. I'm about ready to pull the clutch and see if I can hack solder some wires in there to get around the connector break, and see what the condition of the rest of the system is before I do anything that would require opening it up.

Richard

 

[Paolo has a K1500]

Wish I could remember that juicy bit of information. It sounds less credible each time I say it.