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2467RE: [bmw e28] a/c starts out cold, then heats up

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  • ken@kenholyoak.com
    Jun 14, 2004
      Just went through this today. Found AC to work sometimes and not work at
      other times.

      The refrigerant has been R12 with 134 added along the way. Then sealed up
      with silicone to stop a leaky valve.

      Local AC man did great job converting the old R12 to a new 134 system and
      cost $150 including parts. Done inn two hours.

      Kenneth. H. Holyoak

      Information + Insight = Profit

      POB 68633

      Indianapolis, IN 46268-0633



      -----Original Message-----
      From: Ron Kall [mailto:ronjkall@...]
      Sent: Monday, June 14, 2004 3:31 PM
      To: bmwe28@...
      Subject: Re: [bmw e28] a/c starts out cold, then heats up

      A/C problem - you did not mention how old the freon
      was? this car is R12. some not so good shops have been
      know to put R134a into these R12 systems instead. i
      watched my guy dump 3 lbs. into mine in a shop in LA
      and I made sure it was R12. Good work and cold as ice.
      older systems get looser and leak. belt slippage on
      the compressor pump as the engine heats up? a/c can
      cease to be cool if airflow goes down - stuck in
      traffic or stopped, but mine would always get colder
      as i went longer and faster. good luck.

      Ron Kall

      1986 528e
      1985 535i

      --- sheetfar <sheetfar@...> wrote:
      > I have a 1986 528e.
      > What would cause the air conditioning to work fine
      > for about 15
      > minutes or so, then start heating up slowly?
      > This occurs under the following conditions:
      > * Air vents closed (no outside air leaking in).
      > * Temp switch set to coldest (rotated CCW).
      > * A/C fan speed set to medium or high (2 or 3).
      > * Outside temp above 90 deg F. (It doesn't seem to
      > act up until the
      > outside temp is hot).
      > * Inside air vent (vent above radio) temp starts out
      > at 42 deg F,
      > then slowly works its way up to maybe 55 deg F.
      > What I did so far:
      > * Replaced the expansion valve on the evaporator.
      > The low & high side pressure readings seem ok (20 or
      > so psi low
      > side, and 225 high side. The compressor seems ok,
      > since it cycles
      > off at around 335 psi when the engine revs up. All
      > the gage readings
      > appear to be normal.
      > The heater control valve is working fine.
      > I heard that the evaporator temp sensor on the
      > earlier models could
      > cause icing under certain conditions (Bentley). One
      > parts supplier
      > mentioned the possibility of a bad temp regulator.
      > Any thoughts?

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