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Old 09-22-2003, 11:02 PM
Posts: n/a
R-134a to R-12

Can I go back to the R-12 after R-134a has been put in? A car I was looking to buy had the R-134a put in it recently, and I really wanted the R-12 in it because I think that it cools much better.

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Old 09-23-2003, 07:21 AM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 13,039
Yes you can. Do a search - there is a long thread on here somewhere that discusses everything you need to do.
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Old 09-23-2003, 09:16 PM
Plantman's Avatar
Registered User
Join Date: Jan 2003
Location: Miami
Posts: 2,133
Remove the receiver drier and expansion valve.
Flush, flush and flush some more, each section of components with mineral spirits of brake cleaner or ac flush.

Blow air through each section to remove residue.

Install new drier and expansion valve.

Change R-34 fittings back to R-12 fittings.

Pull a vacuum of -29. (overnight preferably) to make sure you get out any moisture.

Check to make sure you hild a vacuum and recharge with R-12. Make sure you purge the charge line with freon to insure no air gets in the system.

Hope this helps.
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Old 09-24-2003, 12:58 AM
CMuc's Avatar
Join Date: Jul 1999
Location: Port Coquitlam BC, Can
Posts: 92
R-12 is about $28 US a pound!!! Where did you find it? It is a very controlled substance.
Chris Muc

'87 300E 430,000 km

"You can fight without ever winning
But never ever win without a fight"

Neil Peart
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Old 09-24-2003, 07:14 AM
Plantman's Avatar
Registered User
Join Date: Jan 2003
Location: Miami
Posts: 2,133
Take the 609 certification test online @ac

Cost about 15.00 and is sn interesting, open book test. Then you could buy locally with you r license or search online.

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