Hi, 86 420 SEL: A/C will come on, blower will run about 1 minute, then blower stops suddenly. Turn it off, turn it back on, it will repeat. Blower speed control switches willnot control speed; blower operates in auto mode always.</P>


Ideas?</P>

 

Bit late but anyway here goes. Not sure if this will help but had a problem with my 1998 C180 with aircon cutting in and out and causing blower speed to change. Turned out to be that aircon refrigerant gas was overfilled.

 

i think he was talking about the inside blower and not the auxilliary fan?

if inside blower, then only two things:

&gt;the motor shaft which drives the fan directly is binding and hard to move. lubricate it.

&gt;the blower regulator is faulty. replace it.