Home » Public Forums » GMCnet » a/c and heater blower/fan question (maintenance)
| a/c and heater blower/fan question [message #338328] |
Sat, 03 November 2018 19:17  |
sandy trout
Messages: 51
Registered: October 2018
Location: texas
Karma: 1
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My heater blower motor has expired, you can barely turn the shaft.
I bought what everyone said was the correct motor (AutoZone PM102) and the blower wheel (AutoZone 35601)
The problem is that the motor fits the housing and has the correct electrical connector, the shaft is really too short for the new wheel, it has to be put almost at the end of the shaft and the set screw barely grabs the shaft to hold it, I managed to get a regular 10-32 nut on the end and it probably wasn't needed.
The blower wheel however will not fit in the housing as it catches and drags on the wheel flange at the base next to the motor.
The configuration of the new motor will not fit the original plastic wheel as the motor shaft is not tall enough.
Any suggestions from anyone who has done this?
[Updated on: Sat, 03 November 2018 19:19] Report message to a moderator |
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| Re: a/c and heater blower/fan question [message #338332 is a reply to message #338328] |
Sat, 03 November 2018 23:08  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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I have had good luck oiling the bearings with a zoom spout oiler. I also flush the commutator and brushes with Caig F5 spray. Flushes out spent carbon and leaves behind a light safe lubricant. You can get to the end bearing through the cooling hole. If the lube has dried this works well. If bearimgs have heen squealing might be too late. There are several motors listed in the interchange. Maybe take old one to NAPA. to match.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: a/c and heater blower/fan question [message #338333 is a reply to message #338328] |
Sat, 03 November 2018 23:09 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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I have had good luck oiling the bearings with a zoom spout oiler. I also flush the commutator and brushes with Caig F5 spray. Flushes out spent carbon and leaves behind a light safe lubricant. You can get to the end bearing through the cooling hole. If the lube has dried this works well. If bearimgs have heen squealing might be too late. There are several motors listed in the interchange. Maybe take old one to NAPA. to match.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: a/c and heater blower/fan question [message #338336 is a reply to message #338328] |
Sun, 04 November 2018 07:32 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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I went through that drill a short time back.
First I ordered a new blower motor from Applied. It turned out to be a different configuration from the original (the motor was deeper into the bracket) and didn't fit. I sent it back and then blew a large amount of dust out of my old motor, oiled it up, and ran it for a few months. It then started to make noise again. I guess the bearings were too far gone to save with a fresh oil job.
I then picked up a new motor from my local parts house that fit fine with my original blower wheel. Some time later, the blower wheel got all wobbly on the shaft and hogged out the hole. I then went through the process of finding a new wheel (not available by it's self) and ended up buying another new motor with a blower wheel on it. It was the same motor I had received from Applied, but with a wheel attached to it that fit the AC box.
IIRC, the listing was for a '75 Toronado. I still have a next to brand new blower motor that doesn't fit my current setup.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: a/c and heater blower/fan question [message #338337 is a reply to message #338328] |
Sun, 04 November 2018 07:33 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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I went through that drill a short time back.
First I ordered a new blower motor from Applied. It turned out to be a different configuration from the original (the motor was deeper into the bracket) and didn't fit. I sent it back and then blew a large amount of dust out of my old motor, oiled it up, and ran it for a few months. It then started to make noise again. I guess the bearings were too far gone to save with a fresh oil job.
I then picked up a new motor from my local parts house that fit fine with my original blower wheel. Some time later, the blower wheel got all wobbly on the shaft and hogged out the hole. I then went through the process of finding a new wheel (not available by it's self) and ended up buying another new motor with a blower wheel on it. It was the same motor I had received from Applied, but with a wheel attached to it that fit the AC box.
IIRC, the listing was for a '75 Toronado. I still have a next to brand new blower motor that doesn't fit my current setup.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: a/c and heater blower/fan question [message #338344 is a reply to message #338343] |
Sun, 04 November 2018 11:20 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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I bought it from Merle's Auto Parts here in Tucson (Parts Plus)
I don't remember the part number, but the GMCMI Parts Interchange has a few numbers that might get you started:
4 Seasons 35587
Murray 208990 or 208971
Those numbers are for '73 - 76 coaches. '77 & '78 are different.
Best chance of getting the right thing is to order one from Applied (motor and blower assy)
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] a/c and heater blower/fan question [message #338351 is a reply to message #338346] |
Sun, 04 November 2018 13:35 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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what Matt is saying is true and I can tell you it's worth it.
You are always welcome to call us as we will help out by giving you part #
and tech help FREE!!!.
Figure it out; since we have a shop that work on these coaches, we mut have
parts and some smarts to help you.
Our Customer base is over 4.000 so we got that way with helping.
Use our toll free line for all your calls.
On Sun, Nov 4, 2018 at 9:48 AM Matt Colie wrote:
> sandy trout wrote on Sun, 04 November 2018 12:01
>> Do you remember the part number from the 75 Toronado you found and where
> you bought it?
>
> Sandy,
>
> This is a great example of the sort of thing that will be easier if you:
> A - Are a GMCMI member and/or know how to access the part interchange list
> B - Fill in a sigfile with at least the specifics of the coach.
>
> All of us are interested to assist you, but it is more difficult if we
> have no idea what specific coach you have. Lots of things changed through
> the
> years of manufacturing and some matter a lot.
>
> Example: For some coaches, the blower motor for a '75 Toro is not
> correct.
>
> Matt
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
> _______________________________________________
> 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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Unsubscribe or Change List Options:
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: a/c and heater blower/fan question [message #338369 is a reply to message #338356] |
Sun, 04 November 2018 21:55 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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sandy trout wrote on Sun, 04 November 2018 18:19Good idea
What is the parts interchange list and how do you get on it?
I see that most everyone has a short coach description at the bottom of their reply, I can't see anywhere to add that on.
78 GMC 26 foot, left factory as a transmode and was finished by Coachman, no model designation anywhere including the tag in the glovebox.
Sandy,
Sorry, I usually include that in the greeting that I usually write.
Goto <Control Panel/Account Settings>
Scroll down some and you will find the place for a sigfile.
It will help if it has a real name so we can know who you are when we meet, a bit about the 78 Royale and include any major mods. A geographic reference is also good because you probably have a brand new friend that is close by and a chapter you should hook up with as soon as practical.
'78 is probably why the fan motor was wrong. A lot changed in 77 and the HVAC was one of them.
If you look around at http://www.bdub.net/GMCLinks.html you can find the online interchange list.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: a/c and heater blower/fan question [message #338481 is a reply to message #338328] |
Wed, 07 November 2018 16:15 |
sandy trout
Messages: 51
Registered: October 2018
Location: texas
Karma: 1
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Member |
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I looked on the list and saw a Four Seasons blower motor 35588 is suppose to work on the 78 GMC but it shows it with a wheel attached and when you look it up it shows only the motor.
Does anyone know if the original plastic squirrel cage wheel fits the motor?
Thanks to everyone for all the knowledge on these things.
78 GMC 26 foot, kitchen on right side, bath with separate shower on left, rear bedroom, one a/c unit mounted in front, Alcoa wheels, no major modifications other than air bags replaced by previous owner
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