| Fan Blower control works intermittently [message #319472] |
Thu, 22 June 2017 20:30  |
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GMC Jimmy
Messages: 199
Registered: September 2016
Location: Niagara, Ontario
Karma: 2
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Senior Member |
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Hello All, I hope everyone's summer is off to a good start.
I did a search here and found several posts dating back to 2012 regardis to why a fan blower motor quits working. Mine started acting up yesterday, I was driving along with the dash AC on and the switch in the HIGH position, I have a 1975 Royale by Coachmen.
If I leave the switch in the HIGH position I noticed it will work for a few minutes then the fan quits, several minutes later the fan comes on and a few minutes later it quits again.
Where should I begin trying to locate what might be causing this intermittent function?
Thanks,
Mike
[Updated on: Thu, 22 June 2017 20:31] Report message to a moderator |
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| Re: Fan Blower control works intermittently [message #319474 is a reply to message #319472] |
Thu, 22 June 2017 20:50  |
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SeanKidd
Messages: 747
Registered: June 2012
Location: Northern Neck Virginia
Karma: 4
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Instead of a fuse, you probably have a thermal breaker...it heats up, opens the circuit..;cools down and closes starting the fan again. Your fan is either failing, or something obstructing the fan, it's pretty easy to pull the fan and see if it spins freely...otherwise you may have a loose connection, causing the wire to heat up. Remember, the high speed fan runs only when the alternator is spinning, low and medium run from the battery.
Sean and Stephanie
73 Ex-CanyonLands 26' #317 "Oliver"
Hubler 1-Ton, Quad-Bags, Rear Disc, Reaction Arms, P.Huber TBs, 3.70:1 LSD Honda 6500 inverter gen.
Colonial Travelers
[Updated on: Thu, 22 June 2017 20:50] Report message to a moderator |
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| Re: [GMCnet] Fan Blower control works intermittently [message #319479 is a reply to message #319472] |
Thu, 22 June 2017 21:12 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Mike,
The fan is badly subject to critter pollution so you probably need to
remove it and clean it; if it's loaded, it will draw excess current and
trip the breaker.
Also, the only ground for the motor is through a ground wire under one of
its mounting screws, which are screwed into the fiberglass blower housing.
In other words, it's VERY subject to loosening. It should have a star
washer and corrosion resistant paste between the ground lug and the motor
flange. A bad ground can cause intermittent operation also, either by
losing the connection or by causing motor slowdown and increased current
draw, again popping the CB .
Ken H.
On Thu, Jun 22, 2017 at 9:30 PM, Mike wrote:
> Hello All, I hope everyone's summer is off to a good start.
>
> I did a search here and found several posts dating back to 2012 regardis
> to why a fan blower motor quits working. Mine started acting up yesterday, I
> was driving along with the AC on and the switch in the HIGH position, I
> have a 1975 Royale by Coachmen.
>
> If I leave the switch in the HIGH position I noticed it will work for a
> few minutes then the fan quits, several minutes later the fan comes on and a
> few minutes later it quits again.
>
> Where should I begin trying to locate what might be causing this
> intermittent function?
>
> Thanks,
> Mike
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: Fan Blower control works intermittently [message #319490 is a reply to message #319472] |
Fri, 23 June 2017 07:07 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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GM did not uses weatherpak connectors in the 70s. Clean the connections at the hi blower relay and the blower resistor. If baddly corroded replace them. Not expensive. I use Caig D5 Deoxit on such connections.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Fan Blower control works intermittently [message #319504 is a reply to message #319474] |
Fri, 23 June 2017 15:12 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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You might want to check the grounding wire as the blower housing is
fiberglass and the screw tends to strip and get loose.
On Thu, Jun 22, 2017 at 6:50 PM, Sean Kidd wrote:
> Instead of a fuse, you probably have a thermal breaker...it heats up,
> opens the circuit..;cools down and closes atarting the fan again. Your fan
> is
> either failing, or something obstructing the fan, it's pretty easy to pull
> the fan and see if it spins freely...otherwise you may have a loose
> connection, causing the wire to heat up. Remember, the high speed fan
> runs only when the alternator is spinning, low and medium run from the
> battery.
> --
> Sean and Stephanie
> 73 Ex-CanyonLands 26' #317 "Oliver"
> Hubler 1-Ton, Quad-Bags, Rear Disc, Reaction Arms, P.Huber TBs, 3.70:1 LSD
> Honda 6500 inverter gen.
>
> Colonial Travelers
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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