348 AC issue | FerrariChat
Buy

348 AC issue

Discussion in 'Technical Q&A' started by Tom_C, Jun 1, 2008.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. Tom_C

    Tom_C Karting

    Feb 20, 2008
    233
    Raleigh area, NC
    Full Name:
    Tom C
    #1 Tom_C, Jun 1, 2008
    AC not working. Control unit seems fine, as all functions as should, although I haven't checked the recirc flap yet, as I understand that it won't prevent the ac from operating. When I pressed on the low pressure valve, I got a weak hiss that went to no hiss in about 5 seconds. That lead me to believe that there was low to no pressure. Car has been converted to 134a, so I headed down to the local Advance Auto and picked up the $30 recharge kit. Put the kit on, and put a bit into the system, and I swear I heard the compressor come on. Compressor went back off (assuming it was the compressor) and would not come on again. I ended up with about 30# on the low pressure side, with no indication that the compressor was working, or the dryer fan? (fan in right wheel well) was coming on. Pulled the pressure switch, and there are 4 wires going to it. Chacking the unit itself, I got pins one and two with some resistance, and three and four with none (arbitrary numbers, cant remember the colors right now) My understanding is two of the wires are high pressure switch, and two are low. Jumped one and two, and the fan in the right wheel well came on. Jumped three and four, and nothing (assuming they were the high pressure, so nothing would happen anyway) When fan cut on, I still never heard anything from the compressor. I haven't checked the voltage to the compressor yet, but was wondering what else it could be. I am assuming that if everything is on, I will have voltage to the compressor, and if the compressor is not working, its a compressor issue. If no voltage, then it's either the pressure switch, or my system pressure is incorrect, and I will need to carry it to someone with the proper gauges to check everything out. Am I on the right track? I'll be posting this in the 348/355 section as well, just for more traffic. TIA
     
  2. parkerfe

    parkerfe F1 World Champ

    Sep 4, 2001
    12,887
    Cumming, Georgia
    Full Name:
    Franklin E. Parker
    #2 parkerfe, Jun 1, 2008
    Once you repair what's wrong, reconvert back to R12 so you can have cool a/c
     
  3. Tom_C

    Tom_C Karting

    Feb 20, 2008
    233
    Raleigh area, NC
    Full Name:
    Tom C
    #3 Tom_C, Jun 2, 2008
    Never had problems with r134 here in NC, temp wise...

    So am I on the right track?
     
  4. Wingnut

    Wingnut Karting

    Feb 11, 2005
    160
    Corolla, NC
    #4 Wingnut, Jun 5, 2008
    Although I'm not a certified AC tech, I do play one in my garage.
    I just solved the no-cool-air problem in the daily driver's AC system and therefore suggest that you do the following:
    1) measure the amount of r134a that actually went into the system. Weigh the can before and after. I do this with my digital fish scale ($20)
    2) put 2 pounds in the system
    3) if this produces no cool air, take it to a certified tech
    or 4) Buy the gages, vacuum pump, and bone up on automotive AC systems.

    I've done #4 because.......I just can't fish all the time.

    Wingnut
     

Share This Page