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Old 10-16-2003, 01:54 PM
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Join Date: Oct 2003
Posts: 15
Question heater blower replacement

I just bought an '86 300E and the heater blower needs replacement - the poor thing sounds like it's going to fall out of the dash. I found a used blower at a salvage yard but I wonder how big a job this is? How easy is it going to be to get the old one out and the new one in? Are there online instructions somewhere that might help?


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Old 10-16-2003, 07:53 PM
Posts: n/a
heater blower

should be able to get to the blower motor under the hood in the center of the car at the windshield . there should be a black cover with 10-15 screws take out your power screwdriver and go to work.
the blower is under the cover and should have acces to it
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Old 10-16-2003, 09:26 PM
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Join Date: May 2001
Posts: 161
You may be able to recondition the blower.

See my posts earlier on an 87 300E blower which made noise and then completely stopped running. I was able to re-lube the motor bearings and replace the brushes with $2.00 alternator brushes from an auto electric alternator repair shop. Worked great and was not costly at all.

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Old 10-20-2003, 12:54 PM
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Join Date: Oct 2003
Posts: 15
heater blower replacement

I took a look under the hood this weekend to see if I could figure out how to get to the blower, but the only cover with screws that I saw was for the wiper blade. I must have missed it somehow. The Bently Mercedes Owner's Bible that I got from Amazon was less than helpful too. Any other suggestions?

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Old 10-20-2003, 02:17 PM
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Join Date: Sep 2003
Location: Back in Colorado for now
Posts: 1,313
I really have no idea on the '86 300E, but the blower on my '84 300D is under the passengers side kick panel in the drivers compartment. Cake to get to.
1984 300D Turbo - 4-speed manual conversion, mid-level resto

1983 300D - parts car

1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


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Old 10-20-2003, 11:26 PM
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Join Date: May 2001
Posts: 161
You can do it !!

It ain't no piece of cake but here's what I remember when I did that re-build on my 87 300E. I can't remember the exact order,
I sold the car and passed on the literature I had accumulated to the next owner. But here is what I remember. Before you dig into it confirm that it's not just the blower control switch inside the car. You can hook up 12V directly to blower motor at the connection under the hood on drivers side behind and near the brake booster on ;the firewall. If you go for removal do these steps. did you find my posts where I described what I did ?? Search post of: DanielW It's old but should still be there.

You have to remove the chrome strip at lower windshield, just snaps up with a wide putty knife or plastic trim wedge.

The entire wiper assembly has to come off entirely: notice how it is installed make sketches if you need to. The wiper arm has to be manually rotated I think I remember it is nearly straight up for removal ??.

The entire black plastic Blower housing around the heater air intake and all related rubber hood seals have to come off. Don' t force any of the pieces they may be old and brittle. There are some nearly hidden screws which all have come off. Seem on mine I had to use a really short phillips screwdriver for some of the screws.

There are clips on the top half of the blower motor --- release these and a single strap clip around the motor will release and allow motor and blower cages(2) to come off as a unit.

I lubed the shaft bearings with moly assembly lube thinned with laquer thinner (which of course evaporated leaving the lube behind) For the brushes (which were worn out on mine) I sanded down some GM alternator brushes which were a little too large and soldered on the wires at the needed angle to work like the OEM brushes. Used JB Weld to hold copper wire at correct angle. Sand contact area on the armature to the exact circle shape so it would touch same as old ones.

Good luck on yours...... or pay the indie or MB man a lot of labour charges . Unless you like tinkering and have done this sort of stuff before you may be safer hiring it done.

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Old 10-21-2003, 01:40 AM
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Join Date: May 1999
Location: Sacramento, CA
Posts: 1,472
I did this last year on mine. It took awhile, and I had to go back a couple of times, but that was mostly because I couldn't find the instructions for the first part of the R&R (the air inlet). Try:

This for the air inlet.

And this for the whole thing (plus notes from my experience).
2000 C 2 3 0 Sport :: 180k
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