Hi
It must be a relay you are referring to , A temp sensor is a solid state
NTC device,no moving part ,on the other hand relay's do occasionally
freeze up and a little contact cleaner squirt & tapping,, frees them.
it may explain the anomaly I have with the ACC on the 126; the
auxiliary cooling fan switches off as the dialled temp is attained but the
compressor keeps running. I am not sure where this relay is located on a
126
The ac cooling increased dramatically when I replaced the monovalve , I
had correctly assumed it to have a leaky diaphragm.
mak
Nah, that sensor's no good. Its other contact turns off the AC
compressor, and it's stuck too. Unplugging it resulted in the
compressor running normally. Banging on the sensor did nothing to
relieve this problem. I have a spare sensor that I'd bought for
my wife's 560 SL last year, which developed a stuck fan contact,
but that problem cleared itself up before I could install the new
sensor. It's been sitting on a shelf since, I'll probably put it in
this car. The full-throttle switch atop the intake manifold also
works to shut off the AC compressor, as it should.
I started putting in a test charge of refrigerant. It fills slowly,
perhaps because it's not too warm out yet today, or perhaps because
there is a restriction in the low-side valving. (I've seen that
before.) But I was able to get a fair amount of test refrigerant in
there and I was starting to get reasonable pressures. Unfortunately
my vent temperatures never got very low, and I thought I even detected
some heat coming out the center vent. The sight glass showed plenty
of refrigerant flow. (Very foamy, as is normal for this refrigerant.)
So I pulled the access panels to the water valve and had a look. It's
not always shut off properly. I don't know if it's a control problem
or a vacuum leak problem, this will bear some looking into. I
manually pulled the valve shut, and then I could feel the vacuum
system kick in, but that never really changed anything at the vents.
The water pipe remained pretty hot. I wonder if the water valve
leaks? (I know it can take awhile to pull the heat out of the heater
core at summer temperatures.) Gotta dive into that too.
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