A/C question
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Senior User
Joined: Oct 2006
Posts: 194
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A/C question
Helloeverybody,
`
-Just repainted interrior and am nowinstallang centech harness.
-Want to get my A/C working againand i have all the parts froma '73 and a '79.
-Impretty sureits factory A/C
-
i dont know what the propper name for the part is, that is in the heater box behind the heater core some kind of condenser with two fittings that exit the box into the enginr compartement.
-i need the name of it so i can look for a new one.
-will post pics when all done.
-Thanks alot
Pete
`
-Just repainted interrior and am nowinstallang centech harness.
-Want to get my A/C working againand i have all the parts froma '73 and a '79.
-Impretty sureits factory A/C
-
i dont know what the propper name for the part is, that is in the heater box behind the heater core some kind of condenser with two fittings that exit the box into the enginr compartement. -i need the name of it so i can look for a new one.
-will post pics when all done.
-Thanks alot
Pete
Super Moderator
Joined: Apr 2004
Posts: 34,505
Likes: 2,822
Check with an AC shop. You are probably looking at an R134 system now, some parts MAY (or may not) be different, or it might be better to use different parts for such a conversion.
Good luck, need to get mine working...........
Good luck, need to get mine working...........
Junior User
Joined: May 2008
Posts: 51
Likes: 0
R 134A systems are normally designed with a larger Condensor core in front of the radiator. sometimes the evaporator core is the same size. I have had good success the a blend of refrigerants called freeze 12 but I don't know the laws in your area. Freeze 12 runs a lot like R 12 and uses the same mineral oil.
Laughing Gas
Joined: Mar 2007
Posts: 754
Likes: 2
From: southwest Wisconsin
My AC guy coverted the factory system in my 76 over to R134 5 or 6 years ago, still blows cold today.
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Senior User
Joined: Jan 2004
Posts: 367
Likes: 1
From: denver
the evaporator shouldn't be any different for the r134a, but the expansion valve and o-rings are different. By the sound of what you are describing, the expansion valve is in the engine compartment, so you should be set for this part of your project.
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Senior User
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Can that freeze 12 be mixed with r-12? My system is r-12 and i dont have any intentions of changing it over so is that stuff allright to run with the existing r-12 and stuff? How much a can is it?
Daddy does have 3 cans of r-12 but since that stuff is priceless he's not using it on my truck especially since we dont no if it will just leak back out. lol
Daddy does have 3 cans of r-12 but since that stuff is priceless he's not using it on my truck especially since we dont no if it will just leak back out. lol
Fleet Owner
Joined: Jan 2004
Posts: 26,007
Likes: 575
From: Brentwood,CA
The evap core can still be bought new for about 140.00. The expansion valve is the same for R134a the pre 77 expansion valve block was used by several auto makers up until 96 so if you need one take a look at some mercedes, jeeps, volvos, saabs and a few more that part number cross references with. The part is still sold new too for about 22.00.
Fleet Mechanic
Joined: Feb 2006
Posts: 1,776
Likes: 5
From: Lorain County, Ohio
Freeze 12 is 80% r-134a. The other 20% is R-142b used to carry the old mineral oil through the system.
Although the manufacturer leads you to believe the two can be mixed (misleading labelling), mixing the refrigerants alters the pressure/temperature characteristics of both.
78Ranger_GARedNeck,
Whether you know it or not, using Freeze 12 is doing a (very shoddy) R134a conversion. That's exactly what you "have no intention of doing". The R134a does the cooling and the R142b carries the old mineral oil.
The only "advantage' to FR-12 is that you don't need to flush the old Mineral from the system and add a different type. Problem is, not flushing and properly servicing a 30+ year old AC system is a very bad idea.
Now, doing a proper service and conversion on your truck will let you field test it and make sure there are no leaks or other problems. You can then re-convert it to R12 with nothing more than swapping out the refrigerant.
Fleet Mechanic
Joined: Feb 2006
Posts: 1,776
Likes: 5
From: Lorain County, Ohio
Here's the EPA site dealing with refrigerant blends and other alternatives:
Choosing and Using Alternative Refrigerants for MVACs | Alternatives / SNAP | US EPA
There is a chart at the bottom that shows the composition of the alternates that the EPA had tested. You can Google the MSDS on the individual components for more in depth info.