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Old 05-24-2002, 12:27 AM
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Mike Murrell Mike Murrell is offline
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Question W126 - Cooler Vent Temps At Slow Vs. Highway Speed

Had local MB tech check low/high side pressure. Checks out. Getting 52 degree air at center vents at highway speed. If I exit the highway and drive around at say 25-35 mph, I soon see vent temps drop to 45 degrees.

Local tech indicated this could be the result of a long list. The car is 11 yrs. old and is equipped with orig. compressor, etc. - R12. Compressor seems to cycle often at highway speed. Suspected overcharging, but again, pressure check indicated all is well.

Serpentine belt is in good shape and properly adjusted.

I suspect an aging clutch and /or expansion valve.

Thoughts appreciated.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
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