The blower motor for the heat and air conditioner is located underneath the glove box on the 97 e420
behind a plastic panel. it's easy to get to, but more than likely its the blower regulator thats defective
there is a solution to this problem without having to replace the whole unit which can cost up to $800.00. there is an s-class regulator that you put on the fan motor that will make it blow simply by
splicing a few wires. there is a company in cal. that sells the regulator for under $100. bucks can't
think of it right now but look up the regulator for e420 and you may get redirected to the site. drmack
HEATER BLOWER MOTOR
Its
faulty blower motor resistor. The low and medium speed on blower motor is
controlled by resistor and its actual speed is high. So because resistor is not
working, blower motors actual speed which is high is working.
It
can be faulty blower motor or faulty blower motor resistor. Get the blower
motor inspected. If it's faulty it has to be replaced.
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For
blower motor testing and replacing, check the link below: ----
http://repairhelpcenter.blogspot.in/2012/02/blower-motor-replacing-for-all-vehicles.html
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These will help.
Thanks.
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