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Go Speedracer, go!
 
SpeedracerIndy's Avatar
 
Join Date: Aug 2002
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Question about the Grainger Heater blower motor fix

For those who have replaced their engine compartment blower motor with the Grainger one. I just did this. The motor just doesn't put out much air at all. I'm wondering if I got a dud motor. The previous owner of my car had back-dated the heat on both sides. I re-installed the blower motor and duct work for the drivers side only. I left the back dated heat in tact on the passenger side. I figured this would give me good heat on the drivers side while idling at a stop light and good heat on both sides when the revs are up. When the motor is running while the car is idling, I can barley feel any heat comming from the vent on the drivers side. Does this sound right?

Got most of my information from this post: 911SC heater blower motor

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1981 SC ROW Coupe

Last edited by SpeedracerIndy; 12-31-2003 at 02:10 PM..
Old 12-31-2003, 01:27 PM
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Location: Charlottesville Va
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I don't notice "strong" heat with a working factory blower, factory heat on both sides, and footwell blowers that work (at least on position 2). Once i get to where I can run it hard up to 4500 or so for a stretch, it gets toasty in the cabin, and the blower keeps up, but it doesn't make my cold car "warm", just tolerable.
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Greg Lepore
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Old 12-31-2003, 04:43 PM
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The factory blower in my 82sc puts out quite a bit of heat, compare with my previous 74 with the older non blower heater system.
Old 01-01-2004, 10:17 AM
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I did the same Grainger motor conversion a few months ago and got the same results. Not much improvement in air flow. Of course, my factory motor has been dead since I bought the car over 7 years ago, so I don't know if the factory motor spins at higher RPM's or not. I'm guessing the Carerra kick-panel blowers would work better, but as I said, it's only a guess.
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David Dryden
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Old 01-01-2004, 12:40 PM
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SpeedracerIndy's Avatar
 
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OK, thanks for the replies. It gets the job done even though it's not blasting air on me. I am just used to my fathers Carrera. Those footwell blowers really do a good job.

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1981 SC ROW Coupe
Old 01-01-2004, 06:14 PM
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