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  #1  
Old 02-22-2000, 10:25 PM
Mike Murrell's Avatar
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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  
Old 02-23-2000, 08:19 AM
ColMc
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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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Old 02-23-2000, 08:37 AM
LarryBible
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Usually when the compressor is "short cycling" like you described, the system is low on refrigerant.

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Larry Bible
'84 Euro 240D, 516K miles
'88 300E 5 Speed
Over 800,000 miles in
Mercedes automobiles
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Old 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.

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