Re: OT GMC Sub. Air Conditioner Question

Posted by jdemaris on April 16, 2005 at 20:30:53 from (209.23.31.95):

In Reply to: OT GMC Sub. Air Conditioner Question posted by Farmall Don on April 16, 2005 at 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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