1st gen a/c questions
I'm trying to gather intel on how the air conditioning was set up on the first gen trucks. I'm looking to piece together a system for my truck, as I'm living in east Texas currently, and a/c is virtually a must. At the same time, my truck is in good enough condition that I'd like to keep it as close to 'stock' as possible, which means that I'd like my a/c to look like it was put there by the factory, or at the very least, by a dealer. What components belong in the system? Where should I look for the compressor, condenser, expansion valve, heater core, etc? Where were all of these components mounted? I know that my truck having the 4d55 will make a small difference. Finally, how well will these components deal with the transition from r12 to r134?
I did the swap on my 2nd gen. It's relatively easy and should be similar. What I did was Gather the lines, condensor, compressor + bracket and the whole evaporator box and control unit. The wiring harness for it should be separate from the body or engine harness since it was a dealer install only. You may need lines and compressor specifically from a 4d55 but I'm not sure. I know the 2.6L a/c is different since the compressor is mounted on a different side of the engine. The 4d55 looks like the compressor mounts up to the same spot as on a 2.0L. It's been ahwile since I looked under the hood of mine.
The retrofit was easy if you're adding it to your truck. Get a kit from NAPA with all the green o-rings and change them all while the lines and parts are out of the vehicle. Buy a new dryer and you're good. On 2nd gen trucks you need the TXV for R-134 but these trucks didnt come with it so retrofitting won't require it unless a 2nd gen R134 txv fits then I'd get one. Also make sure you have a fan shroud or you'll run into issues when the truck idles. I drained all the oil from the compressor and ended up running about 10% over what the R12 refrigerant spec was along with 3-4 oz oil. I'm not sure of the exact specs of first gen trucks.
I found a truck at pick-n-pull that had a/c it's a bolt on kit, had it off in an hour and on my truck in about 2-3 hours, mounting brackets are and wiring are already there.
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