E-Class (W124) 1984-1995: E 260, E 300, E 320, E 420, E 500 (Includes CE, T, TD models)

Problem: AC/Heater Issue

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Old Jan 9, 2008 | 04:08 PM
  #1  
CDP's Avatar
CDP
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From: Orange County, CA
W124's
Problem: AC/Heater Issue

Yesterday, I noticed that my Heater is not blowing on Full Blast as it normally would.

You can barely hear it on - Yes the buttons are on the full setting. Especially when I'm on the front windshield heater button - nothing blows strong.

I can feel the hot air coming from the vents but it's not as strong as it use to be or I mean it's not noticable anymore.

Any ideas as to whats wrong with the Heater/AC system?
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Old Jan 9, 2008 | 04:31 PM
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RhinoLT's Avatar
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From: Los Angeles, CA
95 E300D
I have similar problem... Dunno where to start ,tomorrow going to see mechanic will pay him to find the problem,and maybe i can fix this problem on my own....
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Old Jan 9, 2008 | 07:00 PM
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From: Bellevue, NE
1995 E320 SE, 162,000 Miles (Sold) 2007 CLK350 Cabriolet 2014 ML550
Originally Posted by ChrisDPham
Yesterday, I noticed that my Heater is not blowing on Full Blast as it normally would.

You can barely hear it on - Yes the buttons are on the full setting. Especially when I'm on the front windshield heater button - nothing blows strong.

I can feel the hot air coming from the vents but it's not as strong as it use to be or I mean it's not noticable anymore.

Any ideas as to whats wrong with the Heater/AC system?
The blower is controlled by current draw. If the motor is binding, which happens frequently as they age, it will still run but slowly. Is it making any strange noises? It could also be a bad regulator.
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Old Jan 10, 2008 | 06:37 PM
  #4  
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From: Seattle
1992 400E
your fan is probably on its way out.
happened to my 500e two years ago.
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Old Jan 10, 2008 | 08:18 PM
  #5  
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From: A.C New Jersey
1987 300E
same problem it sounds like my motor is runnin but on like low not like it use to but im wondering if its broken wire when my blower stoped goin full blast i was messing with my head unit not even 60 seconds before it went im thinkin i pinched or pulled a wire or somthing. what are the chances of it going at the same time i put my head unit back, anyways by any chance where u messing with anything like that when it stoped working?
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Old Jan 10, 2008 | 08:33 PM
  #6  
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From: Bellevue, NE
1995 E320 SE, 162,000 Miles (Sold) 2007 CLK350 Cabriolet 2014 ML550
Originally Posted by ChrisDPham
Yesterday, I noticed that my Heater is not blowing on Full Blast as it normally would.

You can barely hear it on - Yes the buttons are on the full setting. Especially when I'm on the front windshield heater button - nothing blows strong.

I can feel the hot air coming from the vents but it's not as strong as it use to be or I mean it's not noticable anymore.

Any ideas as to whats wrong with the Heater/AC system?
If you select low, auto, or high does the speed change at all? If there is no difference at all between low and high I would suspect the regulator or main control board/box. If it tries to speed up but sounds like it's laboring, I would lube the motor bearings.
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