Re: [MBZ] 124 AC woe

2014-07-16 Thread clay via Mercedes
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

Re: [MBZ] 124 AC woe

2014-07-14 Thread Meade Dillon via Mercedes
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

Re: [MBZ] 124 AC woe

2014-07-14 Thread Peter Frederick via Mercedes
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

Re: [MBZ] 124 AC woe

2014-07-13 Thread Meade Dillon
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

Re: [MBZ] 124 AC woe

2014-07-13 Thread Peter Frederick
Evaporator temp sensor is above the accelerator pedal on the side of the heater box. Peter ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to:

Re: [MBZ] 124 AC woe

2014-07-13 Thread Jim Cathey
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

Re: [MBZ] 124 AC woe

2014-07-12 Thread Craig
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 ___

Re: [MBZ] 124 AC woe

2014-07-12 Thread Kaleb C. Striplin
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

Re: [MBZ] 124 AC woe

2014-07-12 Thread Dan Penoff
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

Re: [MBZ] 124 AC woe

2014-07-12 Thread Dan Penoff
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

Re: [MBZ] 124 AC woe

2014-07-12 Thread Peter Frederick
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

Re: [MBZ] 124 AC woe

2011-02-21 Thread Mitch Haley
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

Re: [MBZ] 124 AC woe

2011-02-21 Thread Peter Frederick
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

Re: [MBZ] 124 AC woe

2011-02-21 Thread Max Dillon
: 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

Re: [MBZ] 124 AC woe

2011-02-21 Thread Max Dillon
: 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