I would be surprised if the vacuum had anything to do with the A/C
blowing warm, it is most likely only used for the diverter flaps.
What I suspect may be happening is that when you floor the accelerator
it operates a switch to disconnect the compressor, thereby giving you
full power.
My 87
On Jun 21, 2006, at 4:03 PM, Donald Snook wrote:
The only time I have noticed this phenomenon was climbing
the hills. It worked great on flat runs. Any thoughts?
There are safeguards that cut the AC out when temp is too high,
pressure drops or engine is at very high revs. Did you
Re: my question about the a/c cutting out on hills, Johnny B. wrote:
There are safeguards that cut the AC out when temp is too high,
pressure drops or engine is at very high revs. Did you observe the
gauges? Was the tranny kicked-down?
The engine was certainly at high revs. I was
Marshall wrote:
There is another sensor that will cut
off the AC compressor when the coolant temperature approaches the safe
temperature limit. Either of these COULD be exceeded when climbing a
hill. There MAY also be a pedal switch that cuts off the compressor when
the accelerator
The engine was certainly at high revs. I was making this trip at 80-85
mph. This car has the 103 engine and the 126 (SEL) is a big heavy car,
so at that speed I am always approaching 4000 rpm. I don't recall
whether the transmission had kicked down, but I assume that it had
because I was
This is purely a vacuum storage problem, could even be normal if your
time
on the hill exceeds the volume of vacuum storage.
The AC system normally _consumes_ no vacuum, so this shouldn't happen
regardless. That is, when a pod changes state there is a consumption
of vacuum, but steady-state
If the dash vents switch to defrost at full throttle, you have a vacuum
leak -- there is a tank that holds vac for the system, but leaking
supply lines and/or leaking servos will cause it to cycle back to
defrost at wide open throttle. Usually this is leaking servos, as they
require
Donald Snook wrote:
The air is not really getting warmer and I can still hear the blower
motor running, but I am not getting good flow from the center vents.
The symptom has not repeated itself in over a week. Perhaps it was just
too hot and I was pushing it too hard.
Sounds like vacuum
Donald Snook wrote:
I took a trip 300 mile trip the other day in my 1990 300SEL (128K) and I
noticed that when I was climbing a long steep hill (steep for Kansas,
not steep for anywhere else) my a/c would stop blowing very hard. It
was a very hot day and when the a/c would stop blowing it
very cold. The only time I have noticed this phenomenon was climbing
the hills. It worked great on flat runs. Any thoughts?
Yeah, could be vacuum loss. Does cold air start coming out of
the defrost vents at this time?
-- Jim
Donald Snook wrote:
I took a trip 300 mile trip the other day in my 1990 300SEL (128K) and I
noticed that when I was climbing a long steep hill (steep for Kansas,
not steep for anywhere else) my a/c would stop blowing very hard. It
was a very hot day and when the a/c would stop blowing it was
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