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I have had a similar problem quite a few years ago. You don't mention the model or year of your vehicle. It could be a relay that is on the firewall just below or behind the firewall in engine compartment in front of driver's side of the car. It took a really savvy MB mechanic an hour to locate and fix after 2 months in other shops, including an MB dealership. Mine was a 1988 560SEL that had that problem. After that was fixed, it worked perfectly for another 5 years - at which time I sold the car.
I hope this helps...
Check to see if the clutch on the A/C compressor is turning with A/C on max. If not then the clutch is bad or a fuse blown. Check Freon level or have a shop do a leak test. If you replace the compressor always replace the dryer as well
sounds like u still have a leak and need to have freon added or wasnt fully charged --when ur at idle or lower rpm the compressor will circulate the freon fine and will not cause a problem when u put a load uphill passing or increase the rpm a little more the compressor sucks more and circulates more freon which gives u a lower suction pressure if the suction pressure gets to low the the a/c protects itself and the engine by turning off [low pressure safety] cycling if had done 3 months ago bring back and have tested or u can buy some freon and add to ur system yourself
Unfortunately you might have a coolant leak, in spite of the A/C inspection. I'd get a second opinion from another mechanic. Have the mechanic check to make sure your condenser is not clogged with dirt, rocks and road grime, preventing the A/C system from cooling properly. Notorious problem for automotive air conditioning.
Check to see that the fuse to the A/C is not blown and that the compressor is cycling on and off as it should. If the the A/C pressure switch was not inspected, it should be inspected and tested for proper operating.
One last thing. Also have the mechanic check the pressure in the A/C system, and that there is sufficient refrigerant in the system.
This Could be And is Normaly Caused by the ORFICE TUBE Getting Clogged up it Must Be Replaced and FREON Replaced R-134A is the FREON Used in this System, The Age of your Vehicle is My Clue that this MAY BE Your Problem
Let's say about 50/50. Open the hood, check along the thin pipeline running from the compressor (some call it the ac motor), through the condensor (the outside aircon radiator) to a little black tank that looks like a soda can. On top of this there should be a sightglass where you can see liquid flowing if the compressor is running and the freon is ok. If the engine is running and the ac is switched on, the ac compressor should be running - the inside part, the outside (pulleys) always run. If it is not running, first check the fuse for the ac, if the fuse is ok the ac might have a leak and then the pressure switch on the thick pipe side will prevent the compressor switch to engage - then the compressor won't run.
Check your ac piping, if it is oily, especially near flare nuts, it could indicate a freon leak. I'm talking about oiliness that doesn't come from the engine or tranny.
There may be a problem with the AC compressor pressure cycling switch, it turns the AC compressor on and off as required to maintain proper pressure in the system, it is located in the low side line (large AC line) under the hood, it will have 2 or 3 wires going to it.