PeachParts Mercedes-Benz Forum - View Single Post

79300sdtd · #5 02-03-2007, 11:49 PM

Quote:

Originally Posted by Amphicar770

Thanks. A few folks pointed that out and I have been offered three theories:
1) A/C is undercharged.
2) A/C is overcharged.
3) Bad evap core temp sensor.

That will be a spring-time project but comment from any A/C gurus is certainly welcomed.

if any charging is off it should be overcharged. sealed systems are set up to keep the refridgerant liquid up to the evaporator. then at the evap the refridgerant expands and cools significantly causing frost. then by the time it reaches the other side there should not be anymore cooling and therefor no frost on the lines afterwards. a good charge will frost the whole evap and nothing more. over charging will burn out your compressor faster and under charged (significant) will not let the compressor run. I work for an appliance repair place and that is where i got my refridgerant info from.