Heater Blower Motor, How to remove it for replacement Options

[sburns1967]

I have a 1973 914/4 2.0 which is is partially disassembled.

It came with two hot air blowers:

Single Port - Working Motor
Dual Port - Dead Motor

In 1973 there was apparently a switch between the dual outlet blower to a single outlet with a Y pipe.

I was thinking I would like to use the dual outlet one so I thought I would swap in the working motor.

Two questions:

1) Does the dual outlet unit provide better heat flow through the heat exchangers than the single outlet with a Y connector? Any pointers to pictures of each type mounted/hoses?

2) How to remove the motor:

Removed the 6 screws on the motor flange
Removed the nut/washer from the cage fan

After doing so I can get zero movement from the motor from the housing. Even prying between the flange and the housing nothing moves.

Does anyone know if there is some kind of adhesive between the motor flange and the housing? If so do I apply a little heat maybe?

Thanks in advance
Scott

[chmillman]

I have a 1973 914/4 2.0 which is is partially disassembled.


In 1973 there was apparently a switch between the dual outlet blower to a single outlet with a Y pipe.

Actually the "Y" pipe was just an accessory added by some dealers using VW parts. It was not stock from the factory. When they switched to a single outlet blower, they just used one hose on the driver's side. The passenger side had no hose going to it and was capped off. Some people have restored the two hose system using either found old Y junctions or 3D printed new ones.

[wonkipop]

I have a 1973 914/4 2.0 which is is partially disassembled.


In 1973 there was apparently a switch between the dual outlet blower to a single outlet with a Y pipe.

Actually the "Y" pipe was just an accessory added by some dealers using VW parts. It was not stock from the factory. When they switched to a single outlet blower, they just used one hose on the driver's side. The passenger side had no hose going to it and was capped off. Some people have restored the two hose system using either found old Y junctions or 3D printed new ones.

no --- not quite. i say this politely, not a smart arse. (IMG:style_emoticons/default/biggrin.gif)

our L jet research got to the bottom of it.

first of all the early cars just had a straight up 411 blower motor in the straight up position it was mounted in - in a 411 fast back or 4 door. twin hoses. no y junction.
fan had two outlets rather than a single into a y.
mounted off the fan casting.

in 73 (i think - 72?) they went to a single fan outlet. completely unique to 914. biased to drivers side. not mounted off fan casting but off left side of engine bay.
probably a functional engineering idea to assist with demisting the windscreen in front of driver in small 914 cabin?

this persists through 73 and 74 and part way through 75 model year.
then in late 1974 calendar year (75 model year) around about late nov 74/dec74 they begin to fit the cars with the twin hose set up again. but they keep the single hose outlet fan on left side of engine bay. thats when the adapter comes in. and it all comes from the 412 variant heater blower set up.

they use parts from the VW 412 variant - y splitter and long hose to right hand side of car.

now that is what the factory did.

in the half century since all sorts of things have been done to the cars.
but it went down that way.

twin hose with twin outlet fan in early 914s using the twin outlet fan from 411 sedans.

then single hose outlet fan - unique to 914s from 73 through to early 75.
but the fan unit came from the VW 412 variant minus the splitter.

then same fan (which came from 411/412 variant) but fitted with variant splitter and two hoses until end of production.

(IMG:style_emoticons/default/beerchug.gif)

which one works the best?

flip a coin.
they all worked in the VW 411/412.
but there is a problem in a 914 with such a small cabin and with two people in it and the top on during a cold wet night with demisting?
not that i would know because i never drive my 914 in those conditions any more - just top off only and beautiful aussie sunny mornings. so who knows which one works best.

my guess. none of them. it was a problem until the end of production? (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/beer.gif)
why they kept fiddling with it?