Here we are cruising down the highway in the hot weather with the A/C on and all of a sudden it starts to kick into a heating mode; like that's what we need. There seems to be no reason for the change. One minute it's cool and the next it's blowing hot air. We shut the A/C down and then start it up again and it's OK for a for a few minutes. On other days, I can run it for a long time (an hour) with no problems. What's up? Thank you your imput.

You can have a fuse that is acting up. Even when they look good, these fuses can be intermittant. Replace them all with new. (The default mode for the climate control is heat.)

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Benzmac:
Donnie Drummonds
1991 GMC Syclone
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

Dear Benzmac of Duluth, GA:

Took your advice on replacing all of the fuses in our 300E to possibly correct the A/C intermittently defaulting to heat. Thanks to you, the solution to our problem cost me only $6.00 and we are "cool in California". Thanks again!

300E Russ
Antioch, CA