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| Truck & Diesel Mechanic Forum - ASE Medium/Heavy Duty Truck Forum :: Forums :: HVAC Heating Ventilation and Air Conditioning | |||
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 Retrofitting an R12 truck to R134A |
| Author | Post |
| RAV4guy68801 |
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  Joined: Fri Sep 18 2009, 10:50AM Posts: 149 | Yes, surprisingly enough, I had to do a retrofit last week on a 1994 Pete 377 farm truck when the owner requested to have the a/c compressor replaced due to clutch bearing failure. Strange as it may seem, the charging ports for the system were located on the compressor itself with no other locations available to add charging ports. I ended up installing 90 deg ports and charging it thru the low side, even though I had to jumper the clutch to power to get it to engage. I tried unsuccessfully to charge on the high side with the truck off but ended up going the low-side/comp running routine my boss showed me several years ago. An hour later, I had the proper new R134A charge in the system and it was cooling as best as could happen in a 60 deg shop. Any thoughts on where else a charging port could be installed on a rig like this? Anything worth doing is worth doing well!! | ||
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| Master Mechanic |
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   Joined: Wed Feb 04 2009, 05:01AM Posts: 207 | This is a suprise. The last I did any retro's I was working at a Freightliner dealer about 7 years ago. www.TruckMechanicTips.com ASE Master Truck Mechanic L2 Advance Level | ||
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| Moderators: Master Mechanic, popskull, Muffler Bearing, irishniners, hdtrktch, wcdiesel, proffesor |
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