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Thread: P38A - Minor (but irritating) issues

  1. #1
    Join Date
    Mar 2007
    Location
    Warwick Qld
    Posts
    1,554

    P38A - Minor (but irritating) issues

    Getting ready to sell the Limo, and there's a couple of things have happened:

    1. No aircon - there's always been a blend motor fault shows up on nanocom, but this time there's fans, etc but no cool air.

    2. No cruise control - light comes on at the master switch, but nothing happens when you go to set the speed.

    3. Drivers side window - always had a bit of a tight spot halfway up, now it gets to the point it will stop the motor. I'm going to pull the door card tomorrow and have a look.

    Regarding 1 & 2 does anyone know of any common fuse/relay between these two?
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    You have the right to remain silent. Anything you say will be misquoted, then used against you.
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    1999 Disco TD5 ("Bluey")
    1996 Disco 300 TDi ("Slo-Mo")
    1995 P38A 4.6 HSE ("The Limo")
    1966 No 5 Trailer (ARN 173 075) soon to be camper
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  2. #2
    Join Date
    Feb 2010
    Location
    Townsville, QLD
    Posts
    2,506
    Gíday mate,

    #1 can sometimes be solved by replacing relay 6 and 7 in the fusebox, but you say you have blowers no worries, so Iím letting someone with more HEVAC experience take control of that one.

    #2 have a look at the condition of the vacuum lines for the cruise unit in the engine bay, passenger side. They perish and then the unit canít hold vacuum, thus no cruise.

    #3 will likely be just a matter of securing the regulator bracket. From the factory they are riveted in, the rivers break and cause this issue (I currently have the same thing, Iíve found tilting the window backwards by hand as it goes up is a temporary fix).

    Cheers
    Keithy

  3. #3
    Join Date
    Mar 2007
    Location
    Warwick Qld
    Posts
    1,554
    Quote Originally Posted by Keithy P38 View Post
    Gíday mate,

    #1 can sometimes be solved by replacing relay 6 and 7 in the fusebox, but you say you have blowers no worries, so Iím letting someone with more HEVAC experience take control of that one.

    #2 have a look at the condition of the vacuum lines for the cruise unit in the engine bay, passenger side. They perish and then the unit canít hold vacuum, thus no cruise.

    #3 will likely be just a matter of securing the regulator bracket. From the factory they are riveted in, the rivers break and cause this issue (I currently have the same thing, Iíve found tilting the window backwards by hand as it goes up is a temporary fix).

    Cheers
    Keithy
    Thanks Kiethy, I'll give them a go in the morning
    -----
    You have the right to remain silent. Anything you say will be misquoted, then used against you.
    -----

    1999 Disco TD5 ("Bluey")
    1996 Disco 300 TDi ("Slo-Mo")
    1995 P38A 4.6 HSE ("The Limo")
    1966 No 5 Trailer (ARN 173 075) soon to be camper
    -----

  4. #4
    Join Date
    Aug 2010
    Location
    Pakenham
    Posts
    582
    Quote Originally Posted by donh54 View Post
    Getting ready to sell the Limo, and there's a couple of things have happened:

    1. No aircon - there's always been a blend motor fault shows up on nanocom, but this time there's fans, etc but no cool air.

    2. No cruise control - light comes on at the master switch, but nothing happens when you go to set the speed.

    3. Drivers side window - always had a bit of a tight spot halfway up, now it gets to the point it will stop the motor. I'm going to pull the door card tomorrow and have a look.

    Regarding 1 & 2 does anyone know of any common fuse/relay between these two?
    Ok regarding number 1 the a/ c not working, iíd Start with the alternator!
    because if you have weak voltage going in, the a/c clutch wonít engage. Usually a tell tale that the alternator is starting to fail. So do a voltage check and make sure itís sitting above 14volts.

  5. #5
    Join Date
    Jan 2016
    Location
    Netherlands
    Posts
    220
    For the aircon:

    Indeed check if the clutch engages. Check to see if there is pressure in the system (easiest way that will lose you a tiny bit of gas is just presseing the valve. You'd need to hear a good hiss. The system is filled with about 5 bar of gas so it should want to come out quite readily. Measure the voltage on the clutch wire to see if the car tries to engage it, maybe it is broken.

    In general, an aircon always works/get's cold unless the pressure in the system is to high or low (to high only happens with extreme heat or blocked parts in a working system) or the clutch/pump has failed.

    The cruise control:

    The vacuum hoses are your first suspect indeed, you can operate the cruise control pump manually of you put power on the bottom connectors. Not sure which was which but you can run the motor and operate a valve. Just running the motor will produce just a faint vacuum, operating the valve will generate a good vacuum. Also, the brake pedal switch is connected to the vacuum. This switch is adjustable (you can pull it outwars) so it might have gone out of whack which will prevent a good vacuum of forming.

    Lastly, the silver hella boxes (judgind by your MY I think you have one of these) are know to fail often, replacing them with a newer black version (you need the plug from a newer vehicle as well) is the way to go. The wiring is the same.

    Cheers!

    -P

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