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Old 03-24-2014, 08:01 PM   #1
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Air Con Refrigerant

Hi
I'm looking at purchasing a 1989 Winnebago chieftain 36 RQ with tag axle.

Looks in good shape from pics.

My question is in regards to the refrigerant in the automotive unit (Chev 454). If the a/c has not been converted from CFC 12 to newer should I give this one a pass?

It had a new engine 10,000 kms ago so it probably should have had the a/c upgraded to the new refrigerant, I hope. Unit has otherwise babied and fussed over with serious money put into it from the paper work I saw.
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Old 03-24-2014, 08:06 PM   #2
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I do not recommend converting an older unit to R-134A as you will have problems with elastomers and hoses. All of the oil also has to be flushed from the old system.

There are couple of blends that are marketed asa direct replacement to the old R-12. The blends are compatible with your current hoses and elastomers.

One product is marketed under the trade name of HotShot.

Ken
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Old 03-25-2014, 03:48 AM   #3
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freeze 12 is available here
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Old 03-25-2014, 03:58 AM   #4
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not sure why you would convert when R-12 is still available. freeze 12 works, maybe but not near as good.
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Old 03-25-2014, 08:39 PM   #5
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Thanks everyone.

I thought that in Canada the old Freon could not be obtained and that it was illegal to use.

I just might have to make a trip to Texas one day, might get thawed out as we are looking at -20 deg C. come Thursday morn.
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Old 03-26-2014, 03:34 AM   #6
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not sure in canada but when i was looking most places in ebay selling R-12A the A is important that is the new formula. i use Compressor World at 817 790 0110 in alvarado texas
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Old 03-29-2014, 12:37 AM   #7
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I converted my 88 Itasca from R-12 to HFC 134A when I replaced the radiator. There is not that much rubber ac hose that needs to be replaced so in the long run it is worth it. I also replaced the drier and rewired the condenser fans to come on with the ac. It works very good and will blow air down to around 40 degrees here in Phoenix, Az.
It is not the easiest job especially when running the hoses to the evaporator and would be expensive if you are not able to do it yourself.
Here buying R-12 or alternative requires a certification card. HFC134A does not.
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Old 03-29-2014, 12:57 AM   #8
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Quote:
Originally Posted by whem2fish View Post
freeze 12 is available here
Last I heard freezse 12 was just unsmelly propane
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Old 03-29-2014, 09:31 AM   #9
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The replacements for the old R-12 are all blends of 3 to 4 refrigerants. For the refrigerants that replace R-12, there is usually a small amount of propane or other wise known as R-290.

Here is an article which list the replacements for R-12.
http://www.epa.gov/ozone/snap/refrigerants/lists/mvacs.html

The easiest and most effective approach for an older automotive system is just use one of the replacement blends. The service shops love to do conversions to R-134a...good money maker for them.

Ken
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