Dash fan has only hi speed

[ktcnyc]

Hi Folks- Following up on my dash fan - I have a new fan motor, new relay and I just installed a new switch. I pulled the peculiar flash gordon
resister gizmo out and cleaned the plug and connection -Still doesn't work. Is there an update on that gizmo and do you know where I would get a new
resister pack?

Many Thanks, Kevin
--
Kevin Cloutier -'77 Eleganza II-455, 6 disk brakes, Edelbrock carb, headers, , resident of NYC and Dingmans Ferry, Pa.
'72 MGB-GT & '73 MGB convertible
Member GMCMI since 8/20

 

[Ken H.]

Kevin,

You probably took care of this, but just in case: The fan motor gets its
ground via a jumper wire from its case to the body ground, bypassing its
rubber isolation mounts. Those tend to loosen and lose contact. Try using
another jumper wire from bare metal on the motor housing to a known good
ground.

Failing that, it's time to get a test light or multimeter out and start
following the voltage from the fuse, through the switch, etc., etc.

Ken H.

> Hi Folks- Following up on my dash fan - I have a new fan motor, new relay
> and I just installed a new switch. I pulled the peculiar flash gordon
> resister gizmo out and cleaned the plug and connection -Still doesn't
> work. Is there an update on that gizmo and do you know where I would get a
> new
> resister pack?
>
> Many Thanks, Kevin
> --
> Kevin Cloutier -'77 Eleganza II-455, 6 disk brakes, Edelbrock carb,
> headers, , resident of NYC and Dingmans Ferry, Pa.
> '72 MGB-GT & '73 MGB convertible
> Member GMCMI since 8/20
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>

 

[john r. lebetski]

Without a meter, this is getting to be like Facebook advice—- guessing.
All speeds go through the relay. Deenergized it passes the 1, 2, 3, voltage to the motor on the normally closed contacts. Energized (hi and engine
running) the relay contacts flip to the normally open contacts and pass alternator voltage to motor. You did not replace the resistor pack. You could
inspect and meter each wire coil to pins to confirm some Ohm reading not open. Also the new relay or old resistor may still not be making contact at
the old oxidized connectors. I spray all that with Caig D5 before plugging in and sometime you STILL have to wiggle them to get them to work.
That’s why GM went to Weatherpak connectors in the years after our coaches. Try the meter tests and the wiggle method. If that fails you need to
meter voltage per schematic source to motor.
--
John Lebetski
Woodstock, IL
77 Eleganza II