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Old 12-17-2003, 11:44 AM
Registered User
Join Date: Jun 2000
Posts: 45
Heater blower fuse keeps blowing out. help!

Hi all!
happy holidays.

it's real cold here and our 1982 300tdt is continuing to blow its heater fuse.

Does anyone know (since all the parts are pricey), is there a relay for the blower?

would the heater blower (if faulty) cause this fuse to blow out?

it happens as soon as you try to turn on either heat, fan, automatic mode, or defrost.

There is also a heater motor (up front under the hood), would this be a cause?

thanks for any insight!
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Old 12-17-2003, 12:03 PM
Registered User
Join Date: May 2003
Location: Long Island, NY
Posts: 82
You probably have fuse spring clips which have lost their tension from overheating. Also the contact area on the clips could be corroded. A good repair is to remove the fuse panel from the housing and add an inline fuse holder with the newer blade type fuses. You could route the wires in from the top so the new fuseholder is accessable from the top. Be sure to get a heavy enough inline fuse setup.

Your heater blower motor bearings might be dry causing the motor to labor at the lower speeds which will blow the fuse.
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Old 12-17-2003, 12:16 PM
Registered User
Join Date: Jun 2000
Posts: 45

hmm this is interesting.

well, there is no corrosion there, but I can try something with it to reroute.

the blower won't even go on. the fuse blows immediately. is this an indication that it would not be the blower motor???

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Old 12-17-2003, 08:35 PM
Registered User
Join Date: Sep 2003
Location: Rio Rancho, NM. USA
Posts: 229
This may or may not help. It is a well-known problem that '86-'88 300E models have blower motors that build up resistance as they age and will blow fuses on a daily basis if not corrected. I don't know if your '82 may be exhibiting similar problems or not, but MB has a "fix" being an inline fuse bypassing the fusebox. I don't know the part # off hand, but hopefully someone reading this thread does...or contact your dealer.
1996 SL320 97K miles
1996 C220 130k miles
1992 500SEL 170k miles <---sold
1986 300E 216k miles <---sold
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Old 12-28-2003, 04:22 AM
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Join Date: Feb 2002
Location: Bristol, England
Posts: 22

My 126 was doing a similar thing. With mine, there was a large strip of rubber strapping (like the stuff you put on a tennis racket grip) tangled in the fan blades. Once removed the fan worked fine.
1984 500SEC
1988 560SEC
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Old 12-28-2003, 12:08 PM
Registered User
Join Date: Dec 2003
Posts: 51
fan motor blowing fuses

Our '83 240D had that trouble, would run at low speed but blow fuse at higher speed. I took the fan motor out and lu bricated the bearings, got it turning freely by hand and then reinstalled it. No more trouble and that was done ten years and 100K miles ago.
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Old 12-30-2003, 12:52 AM
Registered User
Join Date: Mar 2002
Location: S.F. Bay Area
Posts: 502
Blower motor


I agree with srharvey, pull the blower motor check for ease of rotation, lube the bearing and at the same time check the brushes for wear. They're easy to replace on the newer 123s but you have to dissassemble the motor to put them back in the earlier models.

I've repaired a '77 and an '83. If you're living right and have to replace the brushes, hope it's like the '83.

www.**************.com offers the brushes and a booklet on how to do the job.

Good Luck, Happy New Year All!

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