need help!! no heat!! brrrrrrrrr.... - Mercedes-Benz Forum
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#1 (permalink) Old 12-04-2013, 07:15 PM
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need help!! no heat!! brrrrrrrrr....

Hi Guys!
As an opener, the outer banks were great! the kids didnt have to push start the car, thanks to ur help with the starter problem. My left caliper took a crap on the ferry on the way home, but some strategic driving got me to PA, where i repaired it.
Sooooo...onto my current problem in the cold northeast. No heat coming from vents, which means no defrost either. My blower motor is not spinning, so i removed it (wow, really easy) and checked the brushes. All good. Got a new blower motor FREE (i am so lucky ), but still not spinning. (Maybe not so lucky) My thermostat is good, and my radiator is full. wtf??? What is a girl (and her helpful dad and friends) to do? Only u guys know, so im listening....
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#2 (permalink) Old 12-04-2013, 07:31 PM
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Evil servo system.....nuff said....

If the system is not even working on the default setting defrost, it can be some what easy to fix....

But remember nothing is easy nor cheap on this system....

On the passenger side fender under the hood, you have a few relays.....below them on a wire running to the firewall you will see an inline fuse holder.....twist it and that is where the blower motor fuse is...
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#3 (permalink) Old 12-04-2013, 07:32 PM
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Did you check your fuses? Does the fan work with the heat off? The automatic climate control cars were designed so that the fan wouldn't blow with the heat on until the coolant temp was high enough. An issue with the push button unit or the servo?

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#4 (permalink) Old 12-04-2013, 08:31 PM
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will check fuses...going out with flashlight and friend now. so glad u answered, was hoping you were on.
and my fan does not work at all.
I am soooooooooooooooo hoping it is not the servo...from what i hear that is a nightmare. And i prefer to daydream.
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#5 (permalink) Old 12-04-2013, 08:55 PM
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Originally Posted by cooljjay View Post
Evil servo system.....nuff said....

If the system is not even working on the default setting defrost, it can be some what easy to fix....

But remember nothing is easy nor cheap on this system....

On the passenger side fender under the hood, you have a few relays.....below them on a wire running to the firewall you will see an inline fuse holder.....twist it and that is where the blower motor fuse is...
checked on passenger side, but didnt see anything except some thick wires and maybe vacuum lines...however, i saw relays and inline fuse on drivers side. Took out the fuse to look at it, and it has a red band and green band and is filled with white sand/pellets? would it be on that side?
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#6 (permalink) Old 12-04-2013, 09:05 PM
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Originally Posted by Euro W123 View Post
Did you check your fuses? Does the fan work with the heat off? The automatic climate control cars were designed so that the fan wouldn't blow with the heat on until the coolant temp was high enough. An issue with the push button unit or the servo?
also checked main fuses, and all look good including one for blower motor. I have NO inline fuses i can find on passenger side.
Would it be under dash?
And when we hooked up the new blower motor, there was one set of lines running to it. Is that right? just checking.
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#7 (permalink) Old 12-04-2013, 09:24 PM
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Did you try and power the old and/or new blower motors outside of the car with a direct 12v power source? This will instantly confirm if the blower is bad or if there's another issue. It's usually the best first step when diagnosing a motorized component attached to an otherwise fairly complex system.

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#8 (permalink) Old 12-04-2013, 09:30 PM
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I would also take a digital multimeter to the blower motor plug in. Do you have a dash-mounted fan switch? like on and off fan? I do but idk if it is stock.

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#9 (permalink) Old 12-04-2013, 09:53 PM
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Originally Posted by uberwasser View Post
Did you try and power the old and/or new blower motors outside of the car with a direct 12v power source? This will instantly confirm if the blower is bad or if there's another issue. It's usually the best first step when diagnosing a motorized component attached to an otherwise fairly complex system.
no, i didnt try them on the bench...will do that tomorrow.

Still wondering where the inline fuse is since i cant find it on passenger side under hood. Could it be that one on drivers side?
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#10 (permalink) Old 12-05-2013, 12:05 PM
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Originally Posted by muralart612 View Post
checked on passenger side, but didnt see anything except some thick wires and maybe vacuum lines...however, i saw relays and inline fuse on drivers side. Took out the fuse to look at it, and it has a red band and green band and is filled with white sand/pellets? would it be on that side?
Ooppss sorry got my sides mixed up, that is the fuse I was talking about.....it is full of glass beads.....I believe it can be replace with a standard fuse but I am not positive on the value. I was lucky and had a spare in my trunk from something I pulled at the junk yard....when I removed the old one...the metal caps weren't even sealed anymore....my old one blew when my blower motor went...
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