Blower Unit - AC

zambo

zambo

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I had a look via the search option but couldn't find anything in the threads that came up. I am usually over in the E3 section, but given the numerous contributors here thought you might be able to help me with some advice.

I am recommissioning the Behr unit on my '73 and the blower unit has failed - nearly seized, but not quite. RealOEM shows the part as "ended" so I was wondering if there was a suitable replacement for it in aftermarket that people here have had experience with.

Its a nice car and summer has started in this part of the world so hoping to resolve this if I can.

Thanks for any advice.

Richard
 

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Blower

When you say nearly seized , are you talking about the bearings in the motor Commutator block?
 
As I understand it, the fans should spin very freely with virtually just a flick of a finger on the inner blades. Mine is near impossible to move.
 
Fans

Yes they should spin freely. Perhaps a good blast of Plus Gas or similar around the bearings/ spindles would be a good place to start.
 
I will give it a try then - can't hurt. I will let you know. Reading up on Plus Gas it seems like it is good as a releasing agent, similar but no the same as WD40.

If looking for a longer term lubricant, I wonder is there a spray that would have ongoing lube effects?

Thanks

Richard
 
I was looking into this a few months ago....my blower motor squeaks but still works well so I left it alone.

I've had the box all apart, and this one on ebay looks like it *might* do the trick.

http://www.ebay.com/itm/BMW-AC-Heat...ash=item1c5cb4f5e1:g:rsoAAOSwDk5UIyZU&vxp=mtr

The fans are held on the shaft with an allen screw so they can be swapped over.

Sorry I don't have a definitive answer for you...maybe you can be the first to try it and be a hero for the rest of us!
 
Outcome ...

Using a 2.5mm hex key, removed the grub screws that are accessible through a perfect circular hole on each one of the fan fins. The fan ends slid off after a bit of WD-40 on where the shaft comes through the end of each fan. They get a bit of corrosion and gunk there.

Then I lubed with light machine oil the bearing points at each end of the motor and with very little work it spun freely. Talking to an old AC guy that is recommissioning the engine side of things for me at the moment, he said these fan motors are very robust and can last many years with little to no lubrication. So mine is pretty right now I suggest for a few years.

Mine spun with little-to-no sound once I reassembled the box and hooked it to 12v to test it.

So a nice little project that didn't require too much skill, but interesting from the viewpoint of seeing how simple the whole evaporator set up is on a '70's Behr unit.
 
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