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Tractor Talk Discussion Forum

OT GMC Sub. Air Conditioner Question

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Farmall Don

04-16-2005 13:12:53




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On my 1995 GMC Suburban, I noticed a small leak (Dripping Liquid) on one of the rear hoses (the smaller of the two) to the rear air unit in the back of the vehicle. I went to look it over and noticed it was touching metal on metal where it goes through the hole into the body of the vehicle. Anyway, when I went to move it over it blew and released all the pressure and Freon I would imagine. I assume I need to take it to a lic. Mechanic whom can handle freon. Any idea what that costs, I know freon can get expensive?

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jdemaris

04-16-2005 20:30:53




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 Re: OT GMC Sub. Air Conditioner Question in reply to Farmall Don, 04-16-2005 13:12:53  
I've got two diesel Suburbans with rear air - an 87 and a 93. The rear lines went bad on both. They were aluminum, and G.M. used metal hold down straps on the aluminum lines - which is bad engineering. When dissimilar metals touch each other, and get wet, a sort of "battery" is created and they eat each other up. The straps were originally plastic coated - I assume to prevent this. Once the plastic is gone, the process starts and the lines get ruined. I bet your lines have other weak spots ready to go. You might be better off just having new rubber lines made - it's a lot cheaper than the new G.M. lines. I did it on both of mine. You need barrier hose for the newer 134A coolant because its molecular stucture is smaller than the older R12 and can pass through R12 rated rubber. May be a moot point because I don't think anyone sells any AC hose anymore except for barrier hose (it's called barrier because it has an inner liner - i.e. a "barrier" to keep 134A from leaking).

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Redmud

04-16-2005 16:02:05




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 Re: OT GMC Sub. Air Conditioner Question in reply to Farmall Don, 04-16-2005 13:12:53  
Don, is it a hose? or aluminum tubing? My Suburbans are older and have tubing to the back units.



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Farmall DOn

04-17-2005 13:30:03




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 Re: OT GMC Sub. Air Conditioner Question in reply to Redmud, 04-16-2005 16:02:05  
Its the fitting at the end of the tube.



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MSM

04-16-2005 13:53:39




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 Re: OT GMC Sub. Air Conditioner Question in reply to Farmall Don, 04-16-2005 13:12:53  
95's use 134 refrigerant,you could put a spice in the line,have it evacuated and recharged.Shouldn't be too hatefull a bill.



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RayP(MI)

04-16-2005 14:47:13




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 Re: OT GMC Sub. Air Conditioner Question in reply to MSM, 04-16-2005 13:53:39  
Seal off the leak as best you can, electrical tape, duct tape, etc. Try to prevent dirt and moisture from getting in. Get it serviced as soon as possible if not SOONER! As the other fellow suggested, you might be able to splice the line. We did that with a unit on my car a few years back. Operated fine until I sold it and lost track of it. I use a home appliance service man who works out of his service truck. Substantially cheaper than a car service facility.

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Tyler from Utah

04-16-2005 19:59:57




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 Re: OT GMC Sub. Air Conditioner Question in reply to RayP(MI), 04-16-2005 14:47:13  
If you convert it to R134 it will be loads cheaper BUT!!!! You must and that is a must change the A/C pump i tried to get away with it on my '87 and only got 10,000 miles and had to replace the pump the belt the condenser or some now know of it as a orfis tube and the filter and had to have the lines blowen out and it recharged took 2.75 lbs so i would think about converting it and it will end up cheaper than $80 an lb for the R12 so just so you know!!!! -Tyler

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Bob

04-16-2005 20:52:23




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 Re: OT GMC Sub. Air Conditioner Question in reply to Tyler from Utah, 04-16-2005 19:59:57  
Most, if not all vehicles after 1993 are R-134A, and his Sub certainly would be.



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