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APU TriPac A/C not working

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Manny129, Jun 28, 2011.

Page 1 of 2
  1. Jun 28, 2011 #1
    Manny129

    Manny129 Light Load Member

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    Aug 16, 2010
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    So, yesterday I tried my Tripac and the A/C kicked on. It has never turned on for 1 year now. So all happy that it finally worked, I shut it off and headed off. So Im here in Florida around 89 degrees, its hot and went to go turned on my APU and to my luck A/C not working again. I changed a blown fuse, nothing... Freon was put in 2 months ago. Heater works etc. What can be the problem? Evaporator makes a slight hiss noise and Condenser unit doesn't turn on. Maybe a short? Like I said it was running after a year, now it doesn't again. Fan doesn't work either.

    Thanks
     
    Manny129, Jun 28, 2011
    Manny129, Jun 28, 2011
    #1
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  3. Jun 29, 2011 #2
    Steering Wheel Holder

    Steering Wheel Holder Light Load Member

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    Mar 21, 2011
    Uhmerrica
    0
    Could be your expansion valve is not working right. Clogged from sitting so long.
     
    Steering Wheel Holder, Jun 29, 2011
    Steering Wheel Holder, Jun 29, 2011
    #2
  4. Jun 29, 2011 #3
    Manny129

    Manny129 Light Load Member

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    Aug 16, 2010
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    Where is that located?
     
    Manny129, Jun 29, 2011
    Manny129, Jun 29, 2011
    #3
  5. Jun 29, 2011 #4
    Hardlyevr

    Hardlyevr Road Train Member

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    Jul 30, 2009
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    Which fan doesn't work? There are 3 of them, one for the APU engine radiator, one on the back of the sleeper, and the blower motor under the bunk.
     
    Hardlyevr, Jun 29, 2011
    Hardlyevr, Jun 29, 2011
    #4
  7. Jun 29, 2011 #5
    CondoCruiser

    CondoCruiser The Legend

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    Apr 18, 2010
    Tennessee
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    Sounds like the condensor fan since it ain't working. As soon as you turn the system on the blower should come on and in about 2-3 seconds the condensor fan should kick in. Could be a relay too. I've seen the cfan damaged by truck washes dragging and beating around with the brushes. I had them crack a piece of the shroud where it held the fan blades and would kick the breaker. You couldn't see it unless you were looking right at it. Also that connector can get damaged or wet. Pull it apart and check it out.

    There's a little circuit breaker on the corner of the box near the evaporator fan. You could of accidently reset it and not known it. That's why it come back on for a little until it kicked??

    Are you getting any trouble codes?
     
    CondoCruiser, Jun 29, 2011
    CondoCruiser, Jun 29, 2011
    #5
  8. Jun 29, 2011 #6
    Manny129

    Manny129 Light Load Member

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    Aug 16, 2010
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    Blower Motor and one in the back of sleeper.

    This morning, my son started the APU and the blower motor turned on and the one on the back of the sleeper didn't. Also the Pipe from the APU casing that leads to a filter and then to the back of the sleeper fan, gets hot. Also blower motor doesnt turn on again.
     
    Manny129, Jun 29, 2011
    Manny129, Jun 29, 2011
    #6
  9. Jun 29, 2011 #7
    Manny129

    Manny129 Light Load Member

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    Aug 16, 2010
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    No codes, im going to check fan connections now. I did reset it when it didnt work and it still doesn't. I checked the panel and it looks good. Fuses are all good. APU engine radiator fan works.
     
    Manny129, Jun 29, 2011
    Manny129, Jun 29, 2011
    #7
  10. Jun 29, 2011 #8
    Steering Wheel Holder

    Steering Wheel Holder Light Load Member

    95
    38
    Mar 21, 2011
    Uhmerrica
    0
    Yep, sounds like your expansion valve is clogged. It's the heart of the ac system, when it malfunctions everything like you describe happens. Only way to fix it is to evacuate the system and install a new one. Big $$$. Always exercise the a/c system (even in winter) or stuff starts to clog up the valve over time, especially if it has a small leak.
     
    Steering Wheel Holder, Jun 29, 2011
    Steering Wheel Holder, Jun 29, 2011
    #8
  11. Oct 12, 2016 #9
    bonous

    bonous Light Load Member

    209
    69
    May 31, 2014
    0
    Did you ever get you Tripac repaired. What was the problem? I'm having similar issue with mine. Thanks.!
     
    bonous, Oct 12, 2016
    bonous, Oct 12, 2016
    #9
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