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Old 10-15-2012, 06:57 PM   #15
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Quote:
Originally Posted by JaM Boyer
I am having dash A/C checked currently, sounds as if the system is clogged due to sitting for a number of years whilst previous owners hosted at campgrounds. Mechanic (a personal friend so I trust him) thinks all the pipe/hoses may need to be replaced. Anybody else had a similar problem? Does Navistar keep this kind of thing as spare parts or do I have to get them custom made - I think it's going to be $$$ either way.
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Old 10-15-2012, 07:39 PM   #16
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I have never heard of an A/C system clogging from sitting..I have heard of system clogs from a burnt compressor I do not see any need to replace hoses and pipes The system should be pressure tested for leaks and to verify if there is any refrigerant in the system. the system could be flushed and the receiver dryer could be replaced, if there was a burn out then the txv valve could be plugged mabey remove and replace, Most of the A/C parts are common to other mfg's and could be crossed referenced. The pressure switch was leaking on mine I looked at the part saw the mfg'S name did some online research and bought it for $35.00 my dealer wanted $ 100.00 with shipping.

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Old 10-16-2012, 11:43 AM   #17
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It's a DP, about 80' of A/C lines. The system was empty but by jumping the pressure switch I was able to verify the electrical side was working ok. My mechanic replaced the bypass valve (full of crud, he showed me), he re-filled the system then found the high pressure side was running way too high which is why he suspects partial blockage of the pipes. He is going to run a bore scope down the pipes to confirm but I am expecting the worst. This could involve replacing all the pipes as well as the condenser and possibly heat exchanger, I was thinking about trying to source used parts from a (newer) totalled rig.
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Old 10-16-2012, 12:34 PM   #18
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Mechanic has just confirmed aluminum pipes are corroded and shedding flakes into the system. The pipes will need flushing, the dryer and condenser will need replacing - does anyone have a schematic for the A/C system? I don't have one in the manual that came with the rig.

Thanks in advance,
John Boyer
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