Klimatronic does not work
Posted to HVAC Forum on 2/13/2016
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Hello iatn Fellows:
A Volkswagen Passat 2010 came with the following problem
with its Automatic Klimatronic. It cools badly, sometimes
improve a little and sometimes goes bad again. Scanned and
no code present. Connected the oscilloscope to the signal
wire of the solenoid valve and the signal is showing the
system wants to enlarge the displacement (maximum positive
pulse width) The low pressure is 62 psi and high pressure
165 psi idling and at 2000 rpm the low pressure goes down a
little and after 5 seconds goes up again to the same value
and no change in high pressure value. Very high ambient
temperature, 36 degree. I think that the cause is the
compressor or perhaps it is the solenoid valve. I really do
not know how I can realize if it is the compressor or just
the solenoid valve. I didn't attempt to add refrigerant
because of its high low pressure. You can see the picture of
the signal. Perhaps some of you can give me some advise.
Thank you very much. Francisco
Diego Gaynor Educator/Instructor Cise Electronics Buenos Aires, Argentina
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