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Thread: Air-conditioner problem 2005 Mk1 3.2

  1. #1

    Default Air-conditioner problem 2005 Mk1 3.2

    Hello all,

    I have developed a problem with the aircon system blowing hot air after a recient trip to the car wash. While washing the car they popped the hood and gave it a couple of blasts with a pressure washer and I believe unbeknown they disloged the wiring harness clip to the aircon pressure sensor on the fire wall. On the way home in traffic on King George's what appeared to be steam started emenating from under the hood for a couple of seconds then ceased. We thought it was the junker Camery in front however a few minutes later the misses and the kids started complaining about the humidity and heat, aircon was doing naugh but blow hot air and the penny dropped that the gas emission must have belonged to us. I turned the aircon off and finished the trip home the the Southern Highlands with the windows down.
    Now I can't say definately that the chaps washing the car caused the problem however it seems a little bit congruent with the emergence of my situation. Once home I took a closer look under the hood and found the disconnected wiring harnesses clip which unfortunately made no difference once reconnected.
    So if possible I would ask if anyone out there is familiar enough with the tt mk1 aircon system to know what the ramifications of running the system with the pressure sensor disconnected would be? My guess is contined pressure buildup until something ruptured?
    Alternatively perhaps the chaps washing the car did nothing and the disloged wiring is a result of a failed pressure sensor?

    Any opinions or suggestions are much appreciated.

    Cheers,
    MY05 3.2TTQ

  2. #2

    Default

    Disconnecting a hp or Lp switch would do nothing but break the circuit resulting in a system **** down nothing more. This will do zero damage unless it's made a short circuit and blew a fuse some where. Without any gauges there's very little to do but do. Things you can do is look and listen to see if the compressor clutch is actually engaging. Come from what you have told on here it may be your pressure switch shorting out with water.
    Get some gauges on it and go from there


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  3. #3

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    Any follow up ?


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  4. #4

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    Thanks for the response TYR382.
    The TT is not my daily driver and I posted while on annual leave so I have not had a chance to look into it.
    I will get there and will do a little research into measuring the aircon system pressure as suggested and ensure the compressor is engaging.
    At the time the problem started a fair amount of gas was emitted, pretty sure it was the system being emptied through a significant leak. As the wiring clip for the lp sensor was completely dislodged do you think the sensor could be a source for a leak large enough to empty the system?

    Cheers,
    MY05 3.2TTQ

  5. #5

    Default

    No. A disconnected harnessing connector would only really result in a broken circuit, causing the system to shutdown. Your LP and HP switches are the last line of defence in a ac system. If any component fails say your cabin fan, you will freeze up your evaporator causing the LP switch to shut the system down. Also I highly unlikely you witness the refrigerant escape. Being that cars mostly only gave about 500 grams of refrigerant, it wouldn't be that noticeable. How ever what would be noticeable would be the fluorescent die it would of left behind. So if you truly beleave it was the refrigerant, start looming for oily green stuff along the ac components


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