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| Re: [GMCnet] New Air coolent [message #323242 is a reply to message #323233] |
Sun, 03 September 2017 06:54   |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Senior Member |
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Go to auto store of your choice and purchase R-134 adapters for your R-12 fittings. They just screw on the OEM fittings. Remove old coolant and pull a vacuum. If adding HC12a, oil in A-6 is okay with it. If you are using R-134, the oil must be changed to be compatible with R-134.
Others may add better methods.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] New Air coolent [message #323245 is a reply to message #323233] |
Sun, 03 September 2017 08:23 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Jane Field wrote on Sat, 02 September 2017 23:46What do you have to do to change from R-12 to another coolent?
Jane,
If the system still has any pressure in it, it will not need to be evacuated. You can just refill with HC-12a (aka Duracool). I have had some personal success at partial HC-12 fills. (Someplace out there a purist instructor is slitting his wrists.) It is that compatible with R-12.
Unless you already have a small box full of confusing fittings, just put on the R-134 conversion adapters and get an R-134 service manifold (set of gauges - 45$ at Hazard Fright) and get the low side up to 25psig with the engine at about 1500.
If you decide to change to R-134 (which is due to be phased out before 2030), you have to add the new oil. There is supposed to be available a conversion oil that both is miscible with R-134 (the mineral oil in the system is not) and it is also supposed to keep the PAG oil from attacking the existing seals.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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