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Blower Fan - interior
Posted by: cfmann ()
Date: August 04, 2011 09:10AM

Although I have had this car for a couple years now, I have been going about fixing things that do not work, things that other PO's found irrelevant to fix. It is a 69 LM 'vert.
One being the fan that blows air to the defroster and feet does not work. In a phone interview with a PO a couple of years ago, it was stated that a reputable Corvair mechanic replaced the blower fan with a "higher capacity" style. What that means exactly I don't know, how long ago, not sure.
Although novice in nature, I'm not afraid to take on something new. But I do have a weakness for electrical diagnosis.
And I have searched the phorum for answers and came to no clear answer.
I looked over the fuse block, and it appears I have no blown fuses. My two other control cables appear to work. I have no other electrical problems with the car, I have a brand new battery.
What should I check first, the switch at the front or the fan motor in the back? And how should I check it. Let's take this one step at a time, keep it simple.
thanks in advance
Chris



Edited 1 time(s). Last edit at 08/04/2011 09:11AM by cfmann.

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Re: Blower Fan - interior
Posted by: Marco_a_p ()
Date: August 04, 2011 09:30AM

Check the reistor in the trunk first, then the swtich on the control unit.
If the blower dose not work in any of the positions, it may be blower motor, but unlikely.

resitror should be located in trunk against the RH fender (Sorry been a while)
There are two screws holding it in and when you pull it out, there should be to coiled resister wires. if one or both are broken, motor will not run.

If restistor is good, take a jumper wire and test the switch. one wire comming in is power and two going out are power going out. jump from power comming in to power going out. Power comming in is most likely brown wire. (Check service manual for wirring diagram)


If all that is good, it could be the blower motor, or bad ground to the blower motor. Blower motor is located under the car on RH side, above and to the side of the diff. 6 or sor 5/16 or 1/4 screws hold the motor to the blower manifold/housing. Check to see that power wire is connected and/or connected good, (Orange wire)

If all esle fails, remove motor and inspect for debris and bench test motor. Ground the chasis of the motor and appply 12vdc to the connector tab. Becareful to have a good hold on the motor assembly and your fingers away from the fan blades (squirle cage), they high volume motors are pretty torquey and it can get away from you on start up.

Marco
A 2nd Gen Monza Wagon, a 2nd Gen GB 8door, a 2nd Gen (61's were 1st Gen) R/s and a 62nd Gen Turbo coupe..

Hanging out with the scorpions, king snakes, road runners, coyotes and quails In the southern desert of the silver state
Mesquite NV 89024

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Re: Blower Fan - interior
Posted by: corventure Dave ()
Date: August 04, 2011 10:00AM

There have been reports over the years of the fan switch giving out when one of those higher output fan motors was installed without a relay. Apparently the switch cannot handle the extra load of the new motor.
What I have done is install the relay and use the dash fan switch to close this relay and actuate the high output fan. It's easy... however with this and the way I have done it, there is only one fan speed. I really don't care to have multi fan speeds because when I need defrost or heat, I want all I can get and in a hurry. With the fan off and heat vents open, there is fair flow from the engines fan. I dont think in 40 years of driving Corvairs I have ever used anything other than the high speed setting on the blower fan anyway.

Corventure Dave

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Re: Blower Fan - interior
Posted by: flamingchariots ()
Date: August 04, 2011 02:20PM

Before you go too far, confirm that you have voltage on both sides of the fuseholder. A fuse can be good, but the clips corroded...

Kevin
Medina, OH

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Re: Blower Fan - interior
Posted by: Frank DuVal ()
Date: August 04, 2011 02:49PM

Marco, the fan will run on high speed even with the resistors unplugged. If it doesn't run in any speed, look at the switch, fuse or motor.

You can get to the motor wire from under the car. It is usually a brown wire going to the side of the blower motor, hiding above and to the right of the differential. See if there is any voltage on this wire in any switch position (none in OFF).

Frank DuVal

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Re: Blower Fan - interior
Posted by: cfmann ()
Date: August 04, 2011 06:50PM

okay, step one.. check 69 supplement manual, locate resistor. done.
step two, remove resister and check coils for breakage. done. (in this case, it appears to be okay).
step three, check voltage at fuse block....standby... can't remember where my multimeter is. lol, garage organization....um yea.. i'll get to that...



Edited 1 time(s). Last edit at 08/04/2011 06:50PM by cfmann.

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Re: Blower Fan - interior
Posted by: mrtrimmier ()
Date: August 04, 2011 07:33PM

you got voltage at the fan itself dude?

Regards,
Mike T
Lady's Island S.C.

Black '65 CORSA "parts" car ("RatVair") '65 CORSA Weber/180 ("Whitey") '60 500 Sedan ("Smurf Surf Sedan")


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Re: Blower Fan - interior
Posted by: cfmann ()
Date: August 04, 2011 08:02PM

took the fuse out and cleaned the contacts, and BINGO, I can hear the blower motor turning now. Except I don't feel any air coming out of the vents. When I switch it, I seem to have only one speed, high.
Cool.

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Re: Blower Fan - interior
Posted by: Marco_a_p ()
Date: August 05, 2011 02:33PM

Doh! Forgot about the fuse! X0

Marco
A 2nd Gen Monza Wagon, a 2nd Gen GB 8door, a 2nd Gen (61's were 1st Gen) R/s and a 62nd Gen Turbo coupe..

Hanging out with the scorpions, king snakes, road runners, coyotes and quails In the southern desert of the silver state
Mesquite NV 89024

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