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#1
07-31-2013, 04:07 PM
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Blower fan suddenly goes from low to high
Totally out of nowhere, my blower fan goes from the ANNOYINGLY TOO LOW setting, to the high setting, all on its own about 1 minute after starting the car.
(I wish Mercedes would have made the low about 50% more air flow than it gives; the low setting is just too low). What would cause it go change speeds on its own? I tried it in both the EC (economy with no compressor), and the a/c position, and it does it on both settings. I tried the medium and high settings and those seemed to be fine, the fan speed didn't change when in those modes. I put in a new MB blower fan and regulator probably 5 years ago. Thanks, jeff 1991 300d, 180k Last edited by jbach36; 07-31-2013 at 05:00 PM. 
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#3
08-01-2013, 10:27 AM
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Is the ACC in auto mode? If so, it may be normal. Try the other 2 modes and its behavior.
__________________
85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked
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#5
08-01-2013, 11:15 AM
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That's the resistor pack for the various fan speeds. Pretty simple device. Try to unbend what's bent so the casing is not touching any of the coils. If that doesn't work get a used one from JY. If that doesn't work something wrong in the PBU.
__________________
85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked
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#6
08-01-2013, 11:39 AM
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Uh-oh!
Quote:
Where is the resistor pack you're talking about, and what does it look like, etc.? Thanks.
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#7
08-01-2013, 08:20 PM
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Quote:
__________________
85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked
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Linear Mode
