<VV> Blower fan switch electrical question (link to Forum page)

[Charlie]

You previously mentioned using a relay on the high speed fan motor ~ is this
because "HIGH" operates on a different circuit than "MED" or "LOW" fan
settings?

 

Does the tech guide have a more detailed explanation of the 4-speed
(Off-Low-Med-Hi) fan switch that shows each setting feeds through circuit ?

 

I'm tracing the paths of each setting ~ Off-Low-Med-Hi ~ to see where my
problem is :

The blower motor works on the bench, but not from connector, with 12 volts
OK at resistor. 

 

According to the electrical diagrams in the GM manual, it appears that the
highest speed (where a relay is suggested) is the only one that connects to
the 12 V fuse in the fuse box.

 

The other low and medium speed settings must get 12 volts from some source,
but the diagram doesn't show where it gets its 12 V feed?

 

Here is a URL link to my consolidation/interpretation of the GM diagrams:

http://www.corvairforum.com/forum/viewtopic.php?f=225
<http://www.corvairforum.com/forum/viewtopic.php?f=225&t=9252&p=62195#p62195
> &t=9252&p=62195#p62195

 

 

Charlie

 

From: Kinzelman, Andy [mailto:akinzelm at greatnortherncorp.com] 
Sent: Monday, December 08, 2014 8:29 AM
To: chaz at properproper.com
Subject: VV - Corvair header & fan

 

Charlie,

Some comments:

1.       If the fan is loose on the hub (not motor shaft) - when removed
from the motor; centering it over an appropriate socked and using a punch to
lock them together works well.  A plastic fan out of a non-AC GM (early 70s)
also works well.

2.       A high speed fan motor (later GM) with a relay on the high speed
circuit works wonders (tech guide has this).

3.       A good addition for the late dash is a ground wire with a spade
connector fastened to the steel back of the instrument housing.  Connect
that to spade connector grounded to the under-dash steel structure.  This
fixes a host of grounding ills.

4.       You should get warming air even if the blower motor is not working
(engine fan pushes it).

5.       Heater resistor is in the right front fender (I think); pull it out
and ensure there are no broken wires.

6.       Make sure your lower heater hoses are good.  Do NOT use flexible
aluminum dryer ducting (I've seen it - too much heat conductivity).

7.       Make sure if your left heater hose has wire reinforcement that it
can NOT get to the starter connections (this can cause a nasty short);
either held out of the way and/or with a non-conductive foam collar.  I
prefer Clark's plastic reinforced hose.

8.       If everything is up to snuff these cars make decent heat.  I drive
a Corvair daily here in SE Wisconsin.  No oil leakage into the lower shrouds
is a big plus.

Andy K.

Wisconsin