My 87 TD blower motor works, but only sometimes.
I have only had the car for about 6 months and every electrical item has been intermittent at one time.
I have been able to solve all of them in the fuse box by cleaning contacts and replacing fuses with newer copper fuses.
BUT I cant find the blower motor fuse just to check there.
Does any one know where it is?
Any other ideas that could cause intermittent blower motor activity?

MB moved the High Amp Fuse outside the fuse box.
(It's showing on the 1968 blower control schematic)
It'll be in an individual holder AND it'll be a 30 Ampere Strip fuse
that looks just like a Pre-Glow Relay fuse.
'Just like the Glow relay fuses...this strip fuse can have microscopic cracks
that screw with you from time to time and are hard to diagnose[they are cheap
keep a couple in the glovebox.]

So even if fuse #12 in the fusebox is the new copper type and the holders are
all shiny...Find that single strip fuse and replace it, if bad(a multimeter check
for continuity).Look at it's wire terminations where they screw onto the fuse
holder also!

If that's not it, SIXTO has your game plan mapped out.

Attached Thumbnails

 

__________________
'84 300SD sold
124.128

It can be a loose fuse, a loose contact in the key switch or, most likely, worn brushes in the blower motor itself.

Sixto
87 300D

could this have anything to do with the blower motor regulator? my blower motor was itermittient for awhile and then stopped. i replace it with a new blower motor and it does not put out any air in the cabin.

i noticed the motor does work however because when i hooked up the blower motor ran a low speed with the ignition on.

__________________
MIKE
1987 300D Turbo, 225K
124.133/603.960

BOMC,


Yeees, it could be, how ever we dislike the thought since the REG is underneath
the Wiper apparatus and is so very expensive.It's as if you'll do any and every
thing else to avoid replacing the REG.

Well,No not anything...The heater core and/or evaporator are neck and neck
for "The most avoided job on a W124 chassis".

__________________
'84 300SD sold
124.128

I don't know about that. The regulator is a couple of minutes away once the blower motor is out. Mind you I absolutely hate taking the wiper apart just for that. Especially having worked on 126 and 140 models. You can change blower motors in those cars while waiting at a stoplight! But I digress. My point is that 124s have become fixtures in pick-n-pull yards so there is a steady source of regulators. I don't know what they cost but it can't be that much since they don't know what they are. Heck, keep it connected to the motor and the $20-25 a motor costs becomes a steal. I'd put faith in a wrecking yard regulator since they're not known to go bad. Famous last words

Sixto
87 300D

Where are these yards, Sixto? I haven't seen a 124 in the Windsor P&P in ages (still looking for an uncracked blue dash).

Jeremy

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

There are 3-5 at any give time at the PNP on Commercial in San Jose. They never have those round headlight clips

Sixto
87 300D