The A/C on my sons 1988 300TE is not working... I think it has a leak and or needs a recharge of R12, He is saving up for that, and is not so worried as he will do that in due course.
The problem is regardless of what position the setting are, the blower is pushing HOT air from the windscreen demister vents and side vents if they are open... making it less bearable!
Is this normal?

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2009 Mercedes ML320 Bluetec

check yer fuses!
then check yer heater valve.
also check the control system for vac leaks.

george

All the fuses in the fuse box are good.
I may have a vac leak, but how do I check?

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2009 Mercedes ML320 Bluetec

Well Well!
Ok, I looked at the fuses... none blown....
But I did notice that when you hit the defrost button, the fan did not come on fast as it did before....
So, I looked at the fuses again... wiggled and rotated #7... and hey presto... defrost mode working again!
Wow, good call MBshop... Thanks!
Now, I will see if the thing still blows hot tomorrow!

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2009 Mercedes ML320 Bluetec

Are the center vents blowing cold air?

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"

Mmmmm.
Well, I just went out and drove it.... this is odd...
So, from home and starting off.... temp on min, fan on low and ECO button pushed.... nothing felt from center vents... they are open... hot from side vents and screen vent... and I mean HOT!
Drove two miles..... stopped and picked up my son from work.... he drove and I fiddled.
Hit defrost.... HOT from all vents and Fan comes on max....
Hit Eco button again... suddenly, I get cool air from facia vents and hot from screen vent and then it cools... giving ambient air from all vents.... as it should I think.

Does that make any sense?

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2009 Mercedes ML320 Bluetec