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Old 12-29-2010, 02:19 AM   #1
cedarsanctum
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Exclamation Heater/defroster fan not working, Help!

I need some assistance. I am in the mountains working for 2 weeks and came up here without any of the owners manuals or anything that would tell me which fuses to look at. The heater blower fan was not working on the way up here, but since the first leg of the journey was at highway speed, i didn't notice. As soon as we got to the slower travel mountain road the windows started to fog up, and nothing i could do would make it work. The lights on the dash for the fan work, but nothing comes out. Shutting it all down and restarting did not work. It's been raining constantly since i got here, so i haven't bothered to investigate much yet, and snow is expected for tonight. With a little luck i might get a little dry spell before i leave on the 7th to look at this.
Has anybody got any suggestion what to check? Does anyone know which fuses to check?
Fortunately, we have internet up here, so having the Forum available is a great resource.
Thanks.
Jef
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Old 12-30-2010, 04:31 AM   #2
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Default Re: Heater/defroster fan not working, Help!

Had to replace the blower motor on mine at about 45000 miles.Not hard to change need to remove glovebox to get it out.The motor comes out with a twist and pull.There is a tab you have to depress then turn.It looks like they made it easy to change because they knew you would have to.
If I remember the motor was close to 200 $
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Old 01-01-2011, 04:44 PM   #3
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Default Re: Heater/defroster fan not working, Help!

The fuse is located under the dash on the left side of the driver's side footwell. There are 2 sets of fuses. Look for #12 on the bottom set. It's a 30a fuse. Good luck.
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Old 01-02-2011, 12:56 AM   #4
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Default Re: Heater/defroster fan not working, Help!

Does the fan work at HIGH speed? If so, it could be the resistor block (if the NCV3 still uses one).
--dick
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Old 01-02-2011, 03:20 AM   #5
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Default Re: Heater/defroster fan not working, Help!

From the 2007 Service Manual CD (All I have access to right now)....

Let me know what you need and I'll try to get the info for you....

-Jon

FRONT BLOWER MOTOR


WARNING: Disable the airbag system before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the negative battery (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to take the proper precautions may result in accidental airbag deployment and possible serious or fatal injury.

NOTE: For circuit descriptions and diagrams, refer to Air Conditioning/Heater in Group 8W - Wiring Diagrams.



OPERATION
Possible causes of an inoperative blower motor include:

Open fuse
Inoperative blower motor resistor or power module (depending on application)
Inoperative blower motor switch
Inoperative mode control switch
Inoperative blower motor
Inoperative blower motor circuit wiring or wire harness connectors


NOISE
To determine if the blower motor is the source of the noise, simply switch the blower motor from Off to On. To verify that the blower motor is the source of the noise, unplug the blower motor wire harness connector and operate the heater-A/C system. If the noise goes away, possible causes include:

Foreign material on fresh air inlet screen
Foreign material in blower wheel
Foreign material in the HVAC housing
Improper blower motor mounting
Deformed or damaged blower wheel
Worn blower motor bearings or brushes


VIBRATION
Possible causes of blower motor vibration include:

Improper blower motor mounting
Foreign material in blower wheel
Deformed or damaged blower wheel
Worn blower motor bearings
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Old 01-02-2011, 06:00 AM   #6
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Default Re: Heater/defroster fan not working, Help!

Quote:
Originally Posted by autostaretx View Post
Does the fan work at HIGH speed? If so, it could be the resistor block (if the NCV3 still uses one).
--dick
Doesn't work at all, on any speed. Wish it did, could have defrosted the windshield.
Thanks.
Jef
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Old 01-02-2011, 06:06 AM   #7
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Default Re: Heater/defroster fan not working, Help!

Thanks Jon,
Wildimaginations sent about all i can check on here. When the weather warms a bit and we thaw, i'll investigate. We had 10 degrees the other morning, and still have frozen snow on the ground. Fortunately i don't have to leave until next Friday.

The other problem that has cropped up is condensation building up inside and dripping onto the overhead console, putting out the interior lights and probably the sunroof. Again. Last time it was the antennae leaking, maybe. Gonna have to rethink the insulation in the ceiling to limit the condensation up there.

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Old 01-02-2011, 02:41 PM   #8
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Default Re: Heater/defroster fan not working, Help!

Not that this helps now, but Bruce (bblessing) recommended rain gutter sealant for the gasket. The antenna base is - surprise - sold as an assembly including the gasket that seals the hole in the metal. The tech told me there are three threads on the fasteners that hold it on; stupid design. Anyway, if it's the antenna gasket - at $300 + an hour or two of labor to replace it - I think Bruce, as usual, is correct.

I wish I could be more help, Jef. Have a safe, uneventful trip back. May the weather be with you.

-Jon
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Old 01-02-2011, 05:04 PM   #9
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Default Re: Heater/defroster fan not working, Help!

I have a similar problem right now. My blower will not turn though I have checked the connector and it shows 12 volts but when it's plugged in, the voltage drops to zero. My ground connection is good. I've already replaced the resistor block and still no blower action. I'm now looking for the control box to the blower motor. Can anyone tell me where the control box is located? I'm sure it's not on the center control because all the wires attached to it are too tiny to power up the blower. There's got to be a relay box somewhere but I don't have a schematic location where it's at. Any help is appreciated.
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Old 01-02-2011, 05:56 PM   #10
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Default Re: Heater/defroster fan not working, Help!

Wild?
See http://sprinter-source.com/forum/sho...48&postcount=8 for suggestions.
--dick
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