C320 ACC problem.

Guest (MBNZ) · 2001-08-14

I think that my ACC (thermotronic) is behaving strange. I'm trying to use EC mode whenever possible (no compressor) because of my health problems (dry air makes breathing difficult to me). Now, with 'EC' lamp lit (economy mode) and temperature setting at LO or whatever is lower than ambient temp system is supposed to blow air with temperature close to ambient temp. I know that this thing could get spontaneously warm up due to eg. standing in direct sunlight or due to excessive heat from engine - but driving it for few miles should make air blowing from vents exactly like it is outside. But not on my car. The air seems to be a little warmed up all the time, no matter of other settings. Guys at shop are trying to convince me that this is normal. Do you guys have any experience? because this makes my car virtually unusable except with A/C on all the time because it is simply too hot inside. Of course i've tried that on ambient temps in range 19-22'C (72F) - no luck, still blows warm.

1070 Views 3 Replies 1 Participant Last post by Guest (MBNZ), Aug 20, 2001

Guest (MBNZ)

Discussion Starter · Aug 14, 2001

I think that my ACC (thermotronic) is behaving 
strange. I'm trying to use EC mode whenever 
possible (no compressor) because of my health 
problems (dry air makes breathing difficult to me). Now, with 'EC' lamp lit (economy mode) and 
temperature setting at LO or whatever is lower 
than ambient temp system is supposed to blow 
air with temperature close to ambient temp. I know 
that this thing could get spontaneously warm up 
due to eg. standing in direct sunlight or due 
to excessive heat from engine - but driving it 
for few miles should make air blowing from 
vents exactly like it is outside. 
But not on my car. The air seems to be a little 
warmed up all the time, no matter of other 
settings. Guys at shop are trying to convince 
me that this is normal. Do you guys have any experience? because this makes my car 
virtually unusable except with A/C on all the 
time because it is simply too hot inside. 
Of course i've tried that on ambient temps 
in range 19-22'C (72F) - no luck, still blows 
warm.

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Guest (MBNZ)

Discussion Starter · #2 · Aug 14, 2001

Same thing with mine. It seems to draw air from the top vents and always gets heat from the engine.

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Guest (MBNZ)

Discussion Starter · #3 · Aug 14, 2001

thanks, i assumed that it could be a design flaw

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Guest (MBNZ)

Discussion Starter · #4 · Aug 20, 2001

YOUR ENVIRON SYSTEM WORKS JUST FINE. YOU HAVE TO REMEMBER, THE CAR IS PRETTY WELL SEALED, INCLUDING THE ENGINE BAY. BECAUSE OF THAT, YOU WILL ALWAYS RECEIVE WARMER THAN AMBIENT TEMP AIR. M/B DOES NOT REC. FULL TIME USE OF THE ECON. MODE FOR THIS VERY REASON [OWNERS MAN.] I THINK YOUR BEST COMPROMISE IS TO USE THE A/C, AND ALSO DRAW IN OUTSIDE THROUGH YOUR MIDDLE CONSOLE VENTS THAT HAS BLUE MARKINGS [ I THINK! I HAVEN'T SEEN 'MAX' IN 2 MONTHS BECAUSE I'M OUT AT SEA.]. HOPE IT HELPS, ROB C.

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