Exactly. -D
> On May 28, 2023, at 5:07 PM, Allan Streib via Mercedes > <mercedes@okiebenz.com> wrote: > > Yeah the best way to be sure it's right is to vacuum the system down to > empty, then recharge with the specified amount of refrigerant by weight. This > is what a good AC shop would do. If the system doesn't cool properly after > that, you have other problems. > > Most of us at home probably don't have a refrigerant recovery system and I > personally prefer not to vent the refrigerant into the air, though logically > I know it's not enough to harm anything and technically it is illegal to do > so. So I just look at the pressures and add refrigerant (slowly) until they > look about right. > > > > On Sun, May 28, 2023, at 15:26, dan penoff.com via Mercedes wrote: >> 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 > _______________________________________ 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
