blower motor problem
 

I have a 1991 300d with a 2.5l diesel engine. The blower will only work on low and medium and will not kick into high. Is this a bad blower motor or a relay?

Switch?

for me it was the motor
 

for me it was the motor on its way out but could easily be switch also.

if you go the motor replacement route try to get one from a breaker , also it only takes 30 mins to fit but be absolutely sure to put it in the right way around unlike the dumb arse that fitted mine :mad: (I do it all myself now)

K

switch
 

Do you mean the switch in the dash that has the climate control and all the switches in it? If so then i have already changed that out hoping it would be the fix. So then it must be the motor...correct?