Probably not the solution you desire, but I found out you can use coil cleaning
spray product to dislodge the built up snot on the condenser and it does
increase the cooling effect. I gave it a shot on my S430 and what was once
blackened became silvery once more. The warm weather had been
Ok, after further investigation, I think the new serpentine belt is also
slipping. This Conti belt just makes a lot less noise when it slips. I
think I need a new belt tensioner spring. May try cleaning off the new
belt and pulleys first.
Correction on the vent temperature, 40 deg F is
I forget, is this a diesel or a gasser? Gasser belt tensioners have
to be replaced quite often. Diesels, which have a vastly better
tensioner system, only once or twice a decade will the spring break.
Have had a few shocks go bad and knock, but the belt doesn't slip.
Peter
Thanks all! I think Peter has given me a good place to start trouble
shooting.
Reading the HVAC manual about the evaporator temperature sensor, there is
this note:
On vehicles as of 09/87, the refrigerant compressor is switched off by the
control unit after 2 minutes of operation if there is a
Evaporator temp sensor is above the accelerator pedal on the side of
the heater box.
Peter
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The vent temperature was really nice, it would pull down to 0 deg F.
Way too cold, no matter how nice you might like it to be there.
Things'll ice up. I saw such temps once on the Ebola Fishtank,
when the filter screen at the expansion valve was gunked up.
(This is unlikely to be your
Today I've re-charged the AC in my '95 E300 Diesel in order to have some
decent cooling for the rest of the season. I added about 2 oz of PAG46
compressor oil and about 12 oz of R-134, and the pressure gauges didn't
quite show a full charge (21 Bar on the high side, a little of 2 bar on the
low
On Sat, 12 Jul 2014 19:47:06 -0400 Meade Dillon dillonm...@gmail.com
wrote:
Anyone have a suggestion?
Wait for a hotter day?
Don't run the temperature dial so low?
Change the resistor that determines how cold things can get?
Craig
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It should not be dropping down to 0, I would think more in the upper 30s would
be what temp it should run at the vents
Sent from my iPhone
On Jul 12, 2014, at 6:47 PM, Meade Dillon dillonm...@gmail.com wrote:
Today I've re-charged the AC in my '95 E300 Diesel in order to have some
decent
Yeah, that's way too cold. If the evaporator is freezing up, which it almost
has to be to get duct outlet temps at 0F, the low temperature switch/sensor
would be making the compressor cut out.
One trick I used to do on W126 cars was to remove the low temperature switch
and recalibrate it to
I believe it's the same setup on a W124 - a capillary tube that is inserted
into the evaporator fins from outside the box, with a mechanical switch that
opens and closes based on the temperature of the capillary bulb?
https://www.dropbox.com/s/ef3nr80azddqyhs/MVC-016S.jpg
W124 has a thermistor just in behind the evaporator that senses the
temp. Will cycle the compressor to prevent freeze-up.
However, if the expansion valve is bad, it will seriously overcool,
and then the computer will not turn the compressor back on until the
evaporator thaws out, which
After washing and waxing the E300, I decided to see if the r134 needed a
re-charge, as the AC will work well for about 10 minutes and then lose
effectiveness. I'd noticed last summer that there was very little fluid
visible in the sight glass.
I drove around until the AC got weak, and then
Max Dillon wrote:
Anyone have any advice? Do I simply need to be more patient about letting
the r134 bleed into the system?
If the can has frost on it, it won't be able to supply freon to a system that's
programmed NOT to frost the evaporator side of the system. Either wait for the
can to
You need some warm water to force the freon in -- partially immerse
the can, it will boil and the gas will then go into the system.
You have a frozen evaporator from low freon, that's why the pressure
is so low on the low side (expansion valve is completely closed).
You may also have
: Monday, February 21, 2011 7:09 PM
To: Mercedes Discussion List
Subject: Re: [MBZ] 124 AC woe
Max Dillon wrote:
Anyone have any advice? Do I simply need to be more patient about letting
the r134 bleed into the system?
If the can has frost on it, it won't be able to supply freon to a system
: Monday, February 21, 2011 7:09 PM
To: Mercedes Discussion List
Subject: Re: [MBZ] 124 AC woe
You need some warm water to force the freon in -- partially immerse
the can, it will boil and the gas will then go into the system.
You have a frozen evaporator from low freon, that's why the pressure
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