Re: E39 AC problem

[Morten Fossum]

Thanks

The air filter is clean. As I understand from the lay-out og the heating and
AC system, the evaporater for the AC stands before the heater element. This
way you can use the AC in combination with the heater to dehumidify the air
and then warm it up to what ever temp you like.

I have a German repair maual for the E39, but when it comes to the AC system
it only refer this to be a job for specialists.

I will check the system next week and let you know what we find.

Morten


"Jim Levie" > skrev i melding
...
> On Mon, 13 Sep 2004 19:19:35 -0400, John wrote:
>
> > Is the air filter clean? Could the mixing valve be sending hot water
into
> > the heater element raising the evap temp/pressure?
> >
> I like the though of the hot water valve being open as a cause of the
> problem. A quick diagnostic for that is to simply clamp off the supply
> hose and see if that helps. If it does you'll need to figure out if this
> is a bad valve or a bad control unit.
>
> --
> The instructions said to use Windows 98 or better, so I installed RedHat.
>

[kingarthur]

The AC system is fully independant of the heater/water system.

If the Low pressure side of the AC system is showing more than
3 / 4 bar when the compressor is running , you have a problem.

If LP pressure goes higher than 5 bar the compressor should stop. Same
goes for the HP side , if the pressure goes above 20 bar then the AC
system should close down. If the refrigerant is being released from a
relief valve on the compressor then you have a blockage in the system. I'm
afraid its not a problem you can solve without a set of manifold gauges.

[Morten Fossum]

A blockage in the system should stop the circulation of fluid/gas and thus
the pressure on the suction side of the compressor should be reduced. I also
see that I need pressure gauges to check this problem.


"kingarthur" > skrev i melding
lkaboutautos.com...
> The AC system is fully independant of the heater/water system.
>
> If the Low pressure side of the AC system is showing more than
> 3 / 4 bar when the compressor is running , you have a problem.
>
> If LP pressure goes higher than 5 bar the compressor should stop. Same
> goes for the HP side , if the pressure goes above 20 bar then the AC
> system should close down. If the refrigerant is being released from a
> relief valve on the compressor then you have a blockage in the system. I'm
> afraid its not a problem you can solve without a set of manifold gauges.
>

[Morten Fossum]

I think I've identified the problem. Filling up the system with 134 while
engine running and AC on I could see that the pressure on the HP side of the
compressor just kept on increasing. There is a sensor monitoring pressure or
temp that should start the cooling fan. However this did not happen. The fan
found to be Ok so no I'm about to replace this sensor and hopefully teh AC
is back in operation.

thanks

Morten
"Morten Fossum" > skrev i melding
...
> A blockage in the system should stop the circulation of fluid/gas and thus
> the pressure on the suction side of the compressor should be reduced. I
also
> see that I need pressure gauges to check this problem.
>
>
> "kingarthur" > skrev i melding
> lkaboutautos.com...
> > The AC system is fully independant of the heater/water system.
> >
> > If the Low pressure side of the AC system is showing more than
> > 3 / 4 bar when the compressor is running , you have a problem.
> >
> > If LP pressure goes higher than 5 bar the compressor should stop. Same
> > goes for the HP side , if the pressure goes above 20 bar then the AC
> > system should close down. If the refrigerant is being released from a
> > relief valve on the compressor then you have a blockage in the system.
I'm
> > afraid its not a problem you can solve without a set of manifold
gauges.
> >
>
>