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Blower Motor Resistor
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Supporting Member of Barthmobile.com 6/12
Formally known as "Humbojb"
Picture of Jim and Tere
posted
In trying to determine why the blower motor will not work, Tere has narrowed it down to the blower motor resistor. The odd thing is that it is attached to a plate sitting on top of the radiator. What I've read is that it should be on the other side of the fire wall, close to the blower itself and actually in one of the ducts. I'll attach a picture but I don't know if I resized it correctly. The question is where should the resistor be located?
thanks
Jim


Jim and TereJim and Tere

1985 Regal
29' Chevy 454 P32
8411 3172 29FP3B
Gear Vendor 6 Speed Tranny


 
Posts: 3746 | Location: madisonville tn usa | Member Since: 02-19-2005Reply With QuoteReport This Post
Glassnose Aficionado
Supporting Member of Barthmobile.com 2/09
Picture of Danny Z
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I just replaced one in my Ranger. It was located on the blower motor housing under the hood in a very inconvenient and hard to get to place. Perhaps GM borrowed this "better idea" from Ford and a PO decided to make it easier by fabbing up what you show in the pic. The plug is identical so I'm sure that you are looking at the right thing. You didn't say what the symptoms were, but it usually is no fan on 1, 2, and 3, then full blast on high.
BTW, I'm going to fetch the wiper motors from my warehouse today to see if they are what you need. I'll let you know.


79 Barth Classic
 
Posts: 3708 | Location: Venice Fl. | Member Since: 07-12-2004Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 6/12
Formally known as "Humbojb"
Picture of Jim and Tere
posted Hide Post
Thanks, Danny. At first, we had no power to the motor at all. After some wiring cleanup, Tere was getting intermittent power to the motor which is under the dash on the passengers side. On the engine compartment side of the blower is a big box and I really don't know it's function. I guess it is the heater box. Probably originally contained the evaporator. Looks like almost impossible to get to.

Jim


Jim and TereJim and Tere

1985 Regal
29' Chevy 454 P32
8411 3172 29FP3B
Gear Vendor 6 Speed Tranny
 
Posts: 3746 | Location: madisonville tn usa | Member Since: 02-19-2005Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 6/12
Formally known as "Humbojb"
Picture of Jim and Tere
posted Hide Post
Still haven't figured out where the blower motor resistor should be located. Perhaps someone with an 88 or 89 could tell me where theirs is. Ours was mounted on top of the radiator and exposed to all the elements, i.e., water etc. Most of the people I talk to say that blower motor resistors are usually mounted either in the air flow of the blower or on the side of the blower housing. I could do that but others say the resistors get hot and need air to keep them cool. We've ordered a new resistor which should be here this week.
Jim (aka Hum)


Jim and TereJim and Tere

1985 Regal
29' Chevy 454 P32
8411 3172 29FP3B
Gear Vendor 6 Speed Tranny
 
Posts: 3746 | Location: madisonville tn usa | Member Since: 02-19-2005Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 6/12
Formally known as "Humbojb"
Picture of Jim and Tere
posted Hide Post
We replaced the resistor with an exact duplicate, part # and everything, and now the 3 low speeds work. The resistor has 5 blades however the plug going to it only has 4 slots. Tere found a hot wire in the engine compartment that was not connected to anything and she attached it to the 5th blade on the resistor and now the 4th speed on the blower works. So, I should be satisfied, right? Two things:
1. The resistor gets hot as heck when the blower motor is working. So hot, you can't even touch it.
2. All the GM drawings I have and I have good ones, show the blower motor resistor for both the 1988 RV chassis and the 1988 P chassis, both forward control, and motor home, show the blower motor resistor in the housing where the blower motor is and it is accessible from the inside of the rv. None of the drawings show the resistor in the engine compartment. It just seems to me that a resistor that gets so hot it has to be put in the engine compartment where air can get to it, is the wrong resistor. Of course that's the logic of a guy who can't even be considered a shade tree mechanic.

Jim (aka Hum)


Jim and TereJim and Tere

1985 Regal
29' Chevy 454 P32
8411 3172 29FP3B
Gear Vendor 6 Speed Tranny
 
Posts: 3746 | Location: madisonville tn usa | Member Since: 02-19-2005Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 7/17
Picture of Doorman
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Normally the resister is in the blower housing where air from the blower blows the heat away. If it works where it is at i would call it fixed. Go take an overnight trip and enjoy it. Don't need AC this time of the year so you don't need the gen. By the way . Congrats on your new coach. I always liked the FP in that coach. Stay safe


1986 31' Regal -1976 Class C
454/T400 P30 -350/T400 G30
twin cntr beds - 21' rear bath
 
Posts: 921 | Location: Dayton, Ohio | Member Since: 09-27-2009Reply With QuoteReport This Post
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