New Air coolent
- Thread starter jane field
- Start date
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
--
1975 GMC Avion
KA4CSG
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
--
1975 GMC Avion
KA4CSG
Add 2 cans of duracool and move on
> 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
> --
> 1975 GMC Avion
> KA4CSG
>
> _______________________________________________
> GMCnet mailing list
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>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://bdub.net/gmcmotorhome.info/
Alternator Protection Cable
http://bdub.net/gmcmotorhome.info/APC.html
> 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
> --
> 1975 GMC Avion
> KA4CSG
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://bdub.net/gmcmotorhome.info/
Alternator Protection Cable
http://bdub.net/gmcmotorhome.info/APC.html
> What 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 - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan
OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit
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 - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan
OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit
