Refrigerant used in GMC's house A/C

[peer oliver schmidt]

Morning,

in an old 73 GMC, what refrigerant is used in the house system? R12?
--
Best regards

Peer Oliver Schmidt
PGP Key ID: 0x83E1C2EA

'76a Eleganza II, VA
'73 Sequoia, PA

 

[robert mueller]

Peer,

The roof A/C units use R-22 the dash unit uses R-12.

Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808

-----Original Message-----
From: Peer Oliver Schmidt GMC

Morning,

in an old 73 GMC, what refrigerant is used in the house system? R12?
--
Best regards

Peer

 

[john r. lebetski]

Most roof systems are like home window units with hermetic soldered system and no service ports. If there is a leak, usually a component has failed.
Service ports can be soldered in but system has to be at atmospheric pressure to do so, then the leak repaired, evacuated and recharged.
--
John Lebetski
Woodstock, IL
77 Eleganza II

 

[wrightjohn 2646]

Roof units can be repaired even if it has a leak. Problem today it is non profitable for AC service companies to repair over installing a new unit and the cost benefit ratio make it cheaper to buy new. A lot of younger AC techs do not know how to trouble shoot a unit correctly. The following is a Piercing Valve for adding a port to a sealed system. Been using this type of a valve for over 30 years to repair Wall/Window mounted AC units and central AC units.

http://www.gmcmhphotos.com/photos/general-pictures/p63389-img-11781.html

Just upgraded our Heat Pump/AC unit in Tucson to a high efficient unit and uses the newer refrigerants and runs at a considerably hight pressure than the older coolants.

JR Wright
Michigan

>
> Most roof systems are like home window units with hermetic soldered system and no service ports. If there is a leak, usually a component has failed.
> Service ports can be soldered in but system has to be at atmospheric pressure to do so, then the leak repaired, evacuated and recharged.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
>
>
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[lw8000]

> Roof units can be repaired even if it has a leak. Problem today it is non profitable for AC service companies to repair over installing a new
> unit and the cost benefit ratio make it cheaper to buy new. A lot of younger AC techs do not know how to trouble shoot a unit correctly. The
> following is a Piercing Valve for adding a port to a sealed system. Been using this type of a valve for over 30 years to repair Wall/Window mounted
> AC units and central AC units.
>
> http://www.gmcmhphotos.com/photos/general-pictures/p63389-img-11781.html
>
> Just upgraded our Heat Pump/AC unit in Tucson to a high efficient unit and uses the newer refrigerants and runs at a considerably hight pressure
> than the older coolants.
>
> JR Wright
> Michigan

That is great to know. Do the newer units work as good as the older ones, or is it better to try and stay with the older coolant? I was recently
discussing this very thing in case something ever happened to the roof unit (we still have one of the old ones... and that thing pumps out tons of ice
cold air).
--
Chris S. -
77 Kingsley, 3.70 FD, mostly OEM -
S.E. Michigan

 

[Matt Colie]

> That is great to know. Do the newer units work as good as the older ones, or is it better to try and stay with the older coolant? I was
> recently discussing this very thing in case something ever happened to the roof unit (we still have one of the old ones... and that thing pumps out
> tons of ice cold air).

Chris,

The actual fact is that the newer units are better at lots of things. You can't let that color your thinking. They are a little less efficient
because the refrigerant that was designed to be an efficient refrigerant is no longer available.

If you can live with what you have, keep it. The only reason I had to change to a low profile was my barn door.

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