Diesel RVs: [diesel_mercedes] HVAC Blower Motor Service / Repair

I'm not sure just yet Max ~

I pulled the URO fan out and slapped in the used original one , still no joy .

Testing the new URO one shows it's working so now I have to dig further into the Klima II system and teach my self how to diagnose and repair it......stand by please .

I left the fan out and the lower dash cover off , thinking it'd blow outside air in the open plenum but no ~ .

I guess it's time to begin vacuum testing , I grabbed the Harbor Freight vacuum pump tool and tossed it into the trunk , I need to find a small nipple for it so i can connect it to the little vacuum hoses and actuators , it comes with a large (7/16" or so) male nipple making it useless for Automotive works and God alone knows where I carefully and safely stored my old Mity-Vac tool .

I need to go back and take a dead original HVAC fan apart to see if I can get the brushes from NAPA ~ I bought some and gave a pair to Tom , not seen nor heard about them since , I only ever ask three times then I go elsewhere .

-Nate
Max wrote :

I took apart two radiator fans thinking I would put new brushes in. Both were so melted/destroyed not fixable.Ended up buying a round universal fan from a auto parts store which has worked good. Bummer about the URO fans. Is this to say they are junk? All of them. ?Losing your blower/fan in summer is probably worse because then no air, at least with heat you get some when you get up to speed. Dang I was gonna buy one just for stock on my shelve. Max

On Sat, Mar 26, 2016 at 10:11 AM, vwnate1@... [diesel_mercedes] <diesel_mercedes@yahoogroups.com> wrote:

Yes and no Max ;

It's designed to be very easily removed but not to be serviced / repaired .

I bought the bush kit from Mercedessource , the instructions were missing a page but it's a fairly easy job , having the correct tools for the crimped motor housing is very important .

I took it apart and cleaned a large amount of leaves , dust bunnies and misc. debris out of both the plastic fan wheel (Squirrel Cage) and the heater plentums , then I washed the fan wheel because if you can see the dirt on it , it's unbalanced .

I had some trouble adding one or two drops of lubricant to the moto's shaft , you don't want much in there , Bill hipped me to a Radio Shack needle oiler , they were out of stock and rude , I never did get one and lost the part number (hint) .

In my case the old commutator was worn out so I popped for a new Uro when they dropped the price to $100 even .

It shakes and is noisy on high speed so I don't recommend the Uro brand , not even for FREE if you find one in a junker .

Take the old one out and give it a spin by hand ~ if little or zero turning resistance , take _one_ brush out and try to match them up , if you find them please post the part number , my local NAPA doesn't stock much of anything .

Start to finish it's a two hour job including cleaning the old fan .

$10 is reasonable for the brushes and instructions from Kent I think .

-Nate
Max wrote :

Anyone else have this problem with the blower? Rebuilding one is out of the question right? as I'm guessing they are probably usually very shot? Max

On Sat, Mar 26, 2016 at 7:09 AM, vwnate1@... [diesel_mercedes] <diesel_mercedes@yahoogroups.com> wrote:

THANX Rob ~

How much was it ? .

I'm thinking of this solution too as driving in So. Cal. in Summer sans vent wings or a ventilation blower , is pretty rough although I could use to sweat off 40 pounds....... .

For some stupid assed reason I used hex headed screws to install the Uro brand blower I discovered this as I was doing some curbside service whilst waiting on my Son Thursday evening.....

I really want to get a good blower in there ASAP and ave to dig out a nut driver as the factory tool kit's open ended 8MM wrench is too wide to fit in the recess where the screws are .

Of course , I left the perfect , corret original screws in the foot well of the smashed '84 in the Junk Yard.... .

Pleas advise how $pendy that new blower motor was .

-Nate
Rob wrote :

"This one yielded a nice driver's side door card in Palomino , a good working HVAC fan (the $100 URO brand one quit working after only a few months "

Nate, I bought a new MB blower, as I didn't think the URO one's were going to last, and/or would fry the electronics.

Rob
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