2000 Freightliner Century A/C Problem

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Smellfunny, May 26, 2014.

  1. Smellfunny

    Smellfunny Road Train Member

    1,176
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    Jan 28, 2012
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    Replaced Expansion valves, compressor, and dryer. Flushed system. Bunk is cold but cab is hot.

    The high side line from cab is cold and the low side is hot. They split (cab/sleeper) and from there is where pressures change. Pulled expansion valve off of cab and I don't see any obstructions.

    Any thoughts?
     
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  3. Smellfunny

    Smellfunny Road Train Member

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    Jan 28, 2012
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    OK just installed a new expansion valve at cab. Now all lines are cold. High pressure and Low pressure. The suction pressure went to zero but it was still icy cold. High side around 200. Turn system off and can hear gurgling in dryer and fill it in low side on cab expansion valve.
     
  4. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    Jun 14, 2009
    romulus,mi
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    ideal should be around 20-25 low side.if around 0 you have something wrong.i have had many of those codensers plug up.good luck.
     
  5. Smellfunny

    Smellfunny Road Train Member

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    South Carolina
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    Brand new condenser.

    I just cranked the truck up again. Here is what I saw. High pressure starts around 250 as soon as it starts. Low around 50. 20 seconds of running and the low pressure goes to zero and the high pressure at 150. The lines from sleeper get icy cold immediately. The line starts getting cold directly after the dryer (not icy cold though). Nothing gets hot though.
     
  6. Smellfunny

    Smellfunny Road Train Member

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    South Carolina
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    Replaced the receiver/dryer and everything seems to be normal. Was a brand new dryer. If anyone else has input on the topic please post. Thanks.
     
  7. little cat 500

    little cat 500 Road Train Member

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    Jan 17, 2010
    Abbottstown PA
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    sounds like the water valve is shot my classic did the same thing the valve for the hot to cold setting
     
  8. GrapeApe

    GrapeApe Road Train Member

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    I just did one of those myself. The A/C was working fine, but the heater core just warmed it back up. I don't think that's the problem here though, zero low side pressure is not normal. But, if you suspect that the hot/cold valve is bad, just turn off the heater shut off valves to the cab. If the A/C works good with the valves closed, then you know that you need a new hot/cold valve.
     
  9. jameslawton

    jameslawton Light Load Member

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    May 1, 2013
    Tulsa OK
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    Sounds like its low on Freon
     
  10. Smellfunny

    Smellfunny Road Train Member

    1,176
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    Jan 28, 2012
    South Carolina
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    I think the dryer was bad. After I replaced it I had no more issues.

    Had another truck come in shop with same issue today and his turned out to have blocked high pressure line to expansion valve. It was packed with discatant from dryer. Removed j-block and cleaned it real good. New everything and we are cooling all frosty. This truck did also have bad water cut offs and a non functioning heater cutoff valve. Fixed that also.
     
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