Thanks for the quick replies! I borrowed another digital temperature gauge from a neighbor and the readings were consistently between 26 F and 36 F at "max cold" when checked at the four vents. I suspect the digital Temperature Gauge I had was giving faulty readings too. The AC feels great but I was just concerned about an overfill causing problems. Tomorrow time to buy new gauges and recheck everything. Have a great Memorial Day! Bob K
-----Original Message----- From: dan penoff.com via Mercedes <mercedes@okiebenz.com> To: Okie Benz <mercedes@okiebenz.com> Cc: dan penoff.com <d...@penoff.com> Sent: Sun, May 28, 2023 4:26 pm Subject: Re: [MBZ] AC Overcharged Question!!! AC is all about pressures and temperatures. It’s not something you can guess at and expect a specific outcome. And just as an aside, I suspect the 10 degrees comment was an embellishment rather than an exact reading. These systems have a low temperature cutout that would shut off the compressor if the evaporator freezes or temperature gets below a setpoint. There was a hack for the W126 chassis cars I used to do to mine: The compressor cutout on these was a mechanical switch connected to a capillary tube that was positioned between the evaporator fins in the heater box. It’s easy to remove. I think they typically cut out at 40F or maybe slightly below that. You could recalibrate them by putting the capillary into a glass of crushed ice/water to get it down to near freezing. Using a test light or an ohmmeter, you calibrated the switch to open at the lower temperature. Made a big difference in places like Florida, believe me! -D > On May 28, 2023, at 3:50 PM, Allan Streib via Mercedes > <mercedes@okiebenz.com> wrote: > > I don't think a car AC will ever blow as cold as 10 degrees F. How are you > measuring these temps? > > One can is probably not enough to damage anything, but if you're worried > don't run the AC until you get a working pressure gauge, ideally a set that > measures low and high side pressures. Harbor Freight sells them. > > https://www.harborfreight.com/r134a-ac-manifold-gauge-set-58776.html > > You can then compare your readings to a chart such as this one. > > https://jamcoautoparts.com/systempressuretroubleshootingchart/ > > > On Sun, May 28, 2023, at 14:34, Robert Koziak via Mercedes wrote: >> Hi All, >> I just went to charge my 2011 Mercedes C300. The vents were >> blowing 45 degrees F so I knew it needed some R134. The 134A adapter I >> used has a faulty gauge! I used about one can and the vents were >> blowing 10 degrees F after I charged the system. Did I overfill the >> system and should I let some out? >> Don't want to cause damage...............help! I will buy a new >> gauge tomorrow and check. >> Thanks in advance! >> Bob K > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
