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Old 04-09-2008, 11:06 PM
88 300E
 
Join Date: Apr 2008
Location: New Orleans La
Posts: 2
Unhappy 1988 300e w124 Blower Problems

My blower was making some noise at low speeds and then just quit one day. Bought a new one and put it in tonight. No luck.
Before I bought the blower I searched extensively on this and other sites for all of the common issues. Checked the fuse block first, fuse not blown and everything looked fine. Checked the regulator, seems to be working ok.
I do get some cold air when up at speed going down the road and all of the vent controls seem to work properly.

Well anyhow, put the new motor in tonight and still no luck. Started backtracking from the motor as it is not getting power for some reason. It is not even getting power to the fuse block, got stopped under the dash not knowing where the wires went from there.

I did jump 12v to the fuse block and the blower worked perfectly on all speeds and temps. Checked the 3 wires and the ground doesn't seem to be an issue.

My question is where to go from here as it means for me to continue tracking the wires could get tedious as I just had the dash apart last weekend installing a new ignition tumbler. I was wondering where the power to the fuse comes from. Thanks

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  #2  
Old 04-10-2008, 12:36 AM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
Bat. > Ign sw > fuse block.

Check on each side of fuse to ground w/key ON using test lamp.
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Old 04-11-2008, 09:53 AM
88 300E
 
Join Date: Apr 2008
Location: New Orleans La
Posts: 2
Rechecked everything last night. Strangest thing happened. I pulled the blower fuse out of the circuit to check both legs idividually, and where it was reading to ground with the fuse installed, it was getting power to the fuse. The fuse looked great, but after brushing the ends I could tell there was some oxidation or corrosion. Cleaned up all contacts greased em and reinstalled. All works perfectly now. Thanks...
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Old 04-11-2008, 10:12 AM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
Quote:
Originally Posted by dbsnostra View Post
Rechecked everything last night. Strangest thing happened. I pulled the blower fuse out of the circuit to check both legs idividually, and where it was reading to ground with the fuse installed, it was getting power to the fuse. The fuse looked great, but after brushing the ends I could tell there was some oxidation or corrosion. Cleaned up all contacts greased em and reinstalled. All works perfectly now. Thanks...

Very good.
You are not the first one to get fooled with that fuse..very common.
That is why we always uses a test lamp on EACH SIDE of the fuse ...they can't fool that test....
Every Benz DIYer should have a good test lamp...for sure.......and they are short $$$ for even the real good ones.

A trick on the bullet fuses is to go to BOTH the fuse holder and the fuse ends b/c they are infamous for poor connections right where the holder
meets the fuses...a test lamp will pick that right up. So will a quick spin of the fuse in the holder.

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