Doing AC work? compressor an dryer, can I replace myself?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by thaistick, Apr 2, 2018.

  1. thaistick

    thaistick Road Train Member

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    Don't know much about air conditioning....
    My compressor leaks freon out the front at the pulley. If charged it'll last about 3 months or so. And my dryer looks to be original to the truck (2006 Century).
    So I bought a compressor an dryer, can I just swap them out and have a TA charge the system? Is it as easy as that? Someone had mentioned that the compressor might need oiled?
     
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  3. Justrucking2

    Justrucking2 Road Train Member

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    You will need a few more parts, the dryer, which you have, and I would replace any expansion valves too. Also check your lines. Might be a good idea to have dye put in the system to identify any other potential leaks. You can do this yourself with the proper equipment. Most of which you can get at Harbor Freight or the auto parts store.
     
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  4. Justrucking2

    Justrucking2 Road Train Member

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    Your system is the same as what you will find on the car in your driveway. The key is to know how much R whatever it is your system needs. This has to be weighed or figured correctly prior to charging the system. Nothing fancy is required other than say a vacuum pump and gauges. Harbor Freight, auto parts store, Amazon, etc...
     
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  5. xsetra

    xsetra Road Train Member

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    Yes you can as justrucking2 said.
    Most trucks have a label on the cooling system with amount if refrigerant you need.
    If you just change the parts (compressor, expansion valve, dryer) without running a vacuum on the system the moisture in the system, in time might damage the seals.

    On my truck, to save money, I changed the parts. I disconnected the power to the compressor, to prevent it operating.

    Then I took it to a shop and had them vacuum pump, to check for leaks, and add refrigerant. Cost a couple bucks but I saved in the long run. I changed seals and compressors 3 years in a row, trying to save money, cost me more.
    Good luck.
     
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  6. AModelCat

    AModelCat Road Train Member

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    I'd pressure test the system with nitrogen too. Sometimes you can pull down good vacuum and it'll hold but put 50 psi of nitrogen in and it leaks down rapidly.
     
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  7. thaistick

    thaistick Road Train Member

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    that's what I did.... I bought some new lines also, and needed there help disconnecting some the rusted connections. thanks!
     
  8. Muddydog79

    Muddydog79 Heavy Load Member

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    Easy peasy BUT... be prepared to replace your hoses because when i changed out my compressor and condensor, i ended up having to replace 3 hoses. The aluminum threads vs steel threads dont come loose without a high chance of stripping them. My components were original on a 04 model. What i thought was an easy fix turned into an ordeal. If you need hoses, go to a napa or such and get them, it will cost you a 1/4 of what the dealer would cost. Dont forget new orings, and put antisieze on the new ones. Also if you are lucky to salvage any of the old hoses, look into them and wire brush/ blow out any possible old thread pieces.
     
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  9. Muddydog79

    Muddydog79 Heavy Load Member

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    Just saw this after i posted...your one step ahead of the game.
     
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  10. thaistick

    thaistick Road Train Member

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    Yeah, Freightliner raped me on the 2 new hoses lol. This is the second time I have forgot that NAPA does hoses.... Hopefully these will last another 12 years :)
     
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  11. Muddydog79

    Muddydog79 Heavy Load Member

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    Yeah dealers are rediculous on their prices. 204$ for one hose, napa was 38$.
     
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