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Thread: 1st gen a/c questions

  1. #1

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    Dallas, OR
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    1985 Dodge Power Ram 50
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    4D55-T

    1st gen a/c questions

    Hi all,

    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?

    Thanks,
    Ryan

  2. #2

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    1994 Mitsubishi Mighty Max
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    4G64
    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.

  3. #3

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    1986 Dodge Ram 50
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    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.

  4. #4

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    what years fit the gen 1? the gen 2 stuff fits as well?

  5. #5



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    1980 Dodge D-50
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    79 - 86 is first gen, 86.5 to 94 is 2nd gen. The compressor bracket is the hardest part to find for the 4d55 - all other parts interchange with the gas motors. You may need to add a pulley on the crank - on the 2.6 you have to add a pulley for A/C.
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  6. #6

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    1980 Plymouth Arrow Truck
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    G54B
    I was so lucky, I found a complete NOS a couple of years back for my 1st. gen. on ebay. Unbelievable find. It works perfectly.
    It is fantastic having cold A/C.

  7. #7

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    1980 Plymouth Arrow Truck
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    Here is the link: http://www.mightyram50.net/vbulletin...-and-Questions

    Let me know if I can answer any questions.

  8. #8



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    I saw your truck on the Mitsubishi truck page in Frank Eck's post - it is looking sweet!
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  9. #9

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    Quote Originally Posted by pennyman1 View Post
    I saw your truck on the Mitsubishi truck page in Frank Eck's post - it is looking sweet!
    Brother you got to provide a link.

  10. #10



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    Try this: https://www.facebook.com/groups/1660687334206552/ scroll down to see the post.
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  11. #11

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    1984 Mitsubishi Mighty Max
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    4D55
    Troubleshooting my a/c, noticed the "water temperature switch", a normally open thermal switch that lives in my little diesel's radiator manifold above the compressor, was stuck closed. The switch is connected to the a/c compressor's relay to keep the a/c off until the little engine warms up a little. Because the thermal switch failed closed the a/c worked, after I located and replaced the blown 5 amp a/c fuse Mitsubishi hid by itself between the back of the radio & the center air ducts. Nevertheless, I want to put a working "water temperature switch" in the radiator hose manifold again because I suspect the old one's failure caused the failure of the hard-to-get-to fuse.
    Here's the problem: no auto parts place has a record of such a switch on this truck. They all have the coolant sensor--the one that drives the dashboard temperature gauge. Nobody has the similar-looking a/c compressor water temperature switch.
    The part I'm trying to replace is shaped like a spark plug or glow plug, it's stamped "ND 1136 C 06" around its brass hex head, it has a single paddle-connector on top and the threads measure 10 mm and have fine threads--28tpi by my count.
    Nippondenso's no help, Google either. Anybody found a work-around?
    Thanks

  12. #12



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    contact Mike Warme on here - he is a diesel and Mitsu parts expert
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  13. #13

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    1984 Mitsubishi Mighty Max
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    4D55
    Here's air conditioning specs for '84 Mitsu trucks (and D50s, presumably), stock, from the factory shop manual:
    Compressor: 2F401MH
    Lubrication: SUNISO5GS* 200cc
    Idle up (during a/c operation): 850-900 rpm
    Refrigerant: R12* 700g (1.54 lbs.)
    Click image for larger version. 

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