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Old 11-07-2009, 05:43 PM
abiby abiby is offline
82 380SL & 96 SL500
Join Date: Jun 2008
Location: Southern Illinois
Posts: 245
Originally Posted by Gusfazekas View Post
Boy this car will test your wits! Installed a rebuilt compressor, expansion valve, drier two weeks ago. Proper oil level and freon charge. System was evacuated by ASE tech friend. Compressor won't engage after it ran fine for a week. System shows "high" pressure, the reading is from the low side valve using a DIY freon install gauge. Pressure shows 90 psi. Last week it showed normal. By passing the high pressure switch with a paperclip won't engage the compressor. During some troubleshooting last week, this worked. After the install, I mistakenly connected the wires at the drier in reverse and the fans ran and the compressor would not. I figured out the wiring goof-aw and everything was fine until today. Fuses are OK but won't run. Steve

That is an r134 system? If so, without the compressor running, that
would be about right for both high and low side connections of an equalized system at an ambient temperature of just over 80f.
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