On 23/05/2017 4:34 PM, Karl Wittnebel via Mercedes wrote:
Pressure goes super high, then the compressor fails. It will cool for about
30-40 minutes per compressor. Has new evaporator, new expansion valve new
drier, now on compressor #3 (or about to be). Control unit is new. At least
one new pressure hose. All the vac pods are new, as is the dash. Works
great for awhile, then gradually gets warmer over an hour or so, and that's
it.
Any ideas on how to troubleshoot this further? Tired of throwing
compressors at it. Nippodenso units from rock auto, same as original. Of
course the motor is a 606 now.
Thanks
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No expert on AC but will offer my 2 cents anyway.
Some sort of sensor or control is bad and thus letting the compressor
overload.
Similar but different story. My son had a Nissan Maxima. The starter
went and we put a new one on. It lasted a day or two and went bad too.
Store gave us a replacement. Same thing happened twice more. I asked the
store to get us a different brand as I suspected a bad batch.
Store got me a different brand and in the box was a printed note saying
that we should check and probably replace a relay that tends to go bad
and cause the starter to not disengage. When that happens, the engine
spins the starter motor up to the point where it disintegrates.
Changed the relay and no more issues.
Somehow, your compressor story sounds similar.
RB
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