Printable Version of Topic

Click here to view this topic in its original format

914World.com _ 914World Garage _ fresh air blower

Posted by: jr91472 Feb 7 2005, 05:49 PM

Finally took out the fresh air blower and dis-assembled.....

Attached image(s)

Posted by: jr91472 Feb 7 2005, 05:51 PM

took the motor apart and yuk!!!!

melted plastic....aren't there supposed to be magnets in here? see arrows

anyone want to sell me a fresh air blower? oop, wrong forum.

Attached image(s)

Posted by: Gint Feb 7 2005, 08:18 PM

BTDT

QUOTE
I attempted to rebuild a heater blower motor without much success. Mechanically it was shot. You can see in the pictures that the choke coil from the power lead to the brush kept de-soldering itself when the windings smack the magnets due to the shoddy bushing in the bottom of the housing. Notice the grooves in the magnets. Replaced it with a motor from a 73 single blower unit. The mounting flange of the motor was too large to fit in the 74 double outlet housing. With a die grinder I removed approximately .050 all around the mounting hole in the housing. Sandblasted the mounting clamp. Works like a champ if not a tad weak. The motor is a smaller unit, but it beats freezing.
http://members.rennlist.com/gman/porsche/

Posted by: Michael J Feb 7 2005, 09:21 PM

Yuk, I started trouble shooting my blower this weekend and only got to the point that it would not run when wired direct to the battery. Not good. Next weekend it comes out and hope it looks better than yours. Might be able to get mine rebuilt.

Posted by: dmenche914 Feb 8 2005, 01:35 PM

i played with swaping heat blower parts on one with failed bushings, sometime they changed the direction of rotation, so the squirl cage blower vanes were pointed the wrong way(spun backwards) It still put out air, but not much.

Often the fresh air blower up front fails, and burns up cuase it gets jammed with leaves and crapola coming from the cowl vent. If you run it jamed, it will overheat and melt.

Once repaired, stick some aluminum window screen material under the cowl vents above the blower (spray paint it black)
Do not use nylon window screen, it won't last long in the sun.

The screen will prevent all but the smalled bugs a bits from entering your fan. It will last a lot longer that way. The later factory plastic screen with roughly 1/4 inch holes is much too course to stop pine needles, small leaves,a nd bugs from clogging your fan, and drain lines. Early cars did not even have this factory screen.

Think aluminum bug screen.

Posted by: jr91472 Feb 8 2005, 02:21 PM

QUOTE (dmenche914 @ Feb 8 2005, 11:35 AM)
Once repaired, stick some aluminum window screen material under the cowl vents above the blower (spray paint it black)

awsome idea

this fan has never worked since I have owned the car, but guaging by the melt down, I would say that is what happened here

thanks again

Posted by: JmuRiz Feb 8 2005, 03:25 PM

QUOTE
Early cars did not even have this factory screen

Mine doesn't have that screen and was very much clogged with stuff when I took it apart. Figures it worked when I looked at the car and the whole 10 hour drive home...parked it and the 2nd time driving it didn't work.

I like the window screen idea, looks better than the factory screen.
Keep us up to date on this, I know a LOT of people have fresh air blowers that don't work.

Posted by: jr91472 Feb 8 2005, 05:27 PM

QUOTE (JmuRiz @ Feb 8 2005, 01:25 PM)
Keep us up to date on this, I know a LOT of people have fresh air blowers that don't work.

will do...

Lawrence is bailing me out with the blower out of his parts car. With luck I will have it next week sometime.

thanks all