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#1
02-22-2000, 10:25 PM
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Vehicle is a well maintained '91 300-SEL. 60k miles. A/C compressor cycles on/off about every 10-15 secs. I saw a similar post the other night; some mention was made in that case about the high pressure side running above spec. Does this imply excess R-12? Thanks for your time.
Mike Murrell Last edited by Mike Murrell; 07-13-2005 at 06:01 PM. 
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#2
02-23-2000, 08:19 AM
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Overcharging is one possibility.
If the high press switch is cycling it. Cooling fan coupling or Aux fans n/o . Intermittant O\C in electrical path to the compresser. Bugs and crud between condensor and radiator.
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#3
02-23-2000, 08:37 AM
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Usually when the compressor is "short cycling" like you described, the system is low on refrigerant.
------------------ Larry Bible '84 Euro 240D, 516K miles '88 300E 5 Speed Over 800,000 miles in Mercedes automobiles
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#4
02-23-2000, 10:24 PM
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Or I have seen many that the pressures were too high because the auxillary fan fuse is blown, if so go up by 5 amps.
------------------ Benzmac: 1981 280GE SWB 1987 16V ASE CERTIFIED MASTER AUTO TECHNICIAN SERVICE MANAGER FOR 14 BAY FACILITY MERCEDES SPECIALIST 8 YRS PARTNER IN MERCEDESSHOP.COM
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