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Join Date: Feb 2001
Location: Viera FL
Posts: 5,642
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Blower fan ballast resistor, Trials, tribulations and tips
Driving along yesterday, I noticed that my blower fan only operated at 2 speeds - off and full blast - which indicated the ballast resistor is shot.
I'm sorry to say that a call to Pelican wasn't much help - the person who answered the phone knew nothing about electrical systems (his words) and that without a part number he couldn't help (I was at work, no PET), and then advised me to email pelican tech support (I didn't need tech support, I knew what was wrong and where it was, I wanted to buy a part) Anyways, Since the garage was closed, I called up the not so local Porsche dealer - they want $184 for the resistor!!!! Took it out today - no obvious physical damage, so I soaked it in vinegar to remove the corrosion from the copper. The two little thermoswitches bubbled away for about an hour - after rinsing, drying, and reinstalling the part - everything works. AFJuvat
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Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann. Ihr Brunnen der nutzlosen Porsche Information |
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07-26-2002, 07:51 PM
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Location: new port richey fl
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thats good to know you didnt have to waist 184 dollars
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1984 944 white with brown leather and glass sunroof |
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07-26-2002, 08:08 PM
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Location: Edmonton, Alberta, Canada
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...u know... I agree with paragraph 2, I had the same experience but a different part that I was looking for.
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Alex - PCA Polar Region - Boxster Muncher 86' 944 Turbo - Megasquirt - 326 rwhp/340lbft @ 18 psi SOLD www.edmontonhomelife.com www.edmontonrealestate.ws |
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07-26-2002, 08:17 PM
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What? You can't PET yourself at work?
Thermoswitch? Thought you said resistor? Yeah, one speed! Not two! Just like zero isn't a number. (Doesn't have a value)  Watch out! Here comes the weekend!
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! Last edited by SoCal Driver; 07-26-2002 at 11:29 PM.. |
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07-26-2002, 08:47 PM
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Location: New Jersey
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Yo, is ther a way to get pet to run off of a CD as oppsoe to a disk drive? I don't like how it installs it self to a disk drive like that. It would be cool to get it to run off of a CD so you can bring it with you where you go. I have to work on that.
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{1987}944S - (SOLD). |
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07-26-2002, 10:24 PM
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Location: Viera FL
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Naah, it could have waited, If I had access to PET at work I would'nt be very productive.
Yeah, the resistor has 2 thermoswitches in it. They look like small relay switches and they are stamped with 100Deg C on the side. Playing with it before I put it back in, it looks like as the switch heats up from current, depending on what speed your fan is set at, they open or close to route the current through the appropriate resistor (which there are 4) I think this is one of those grossly overengineered parts that Porsche is notorious for. AFJuvat
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Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann. Ihr Brunnen der nutzlosen Porsche Information Last edited by AFJuvat; 07-27-2002 at 07:14 AM.. |
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07-27-2002, 06:54 AM
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AFJuvat,
Thought you had a pre 85.5 car?
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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07-27-2002, 10:42 AM
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Nope, a 85.5, Mfg June 1985 - Just had its 17th Birthday.
AFJuvat
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Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann. Ihr Brunnen der nutzlosen Porsche Information |
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07-27-2002, 08:12 PM
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Join Date: Nov 2003
Location: Barrie, Ontario Canada
Posts: 2,954
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digging up old old posts;
My blower motor only works on high so I think I need to change or replace the balast resistor. I have looked on clarks garage and I think they call it the Series resistor (6) I just want to confirm before I go tearing into this 
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09-29-2006, 06:17 PM
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Just thinking out loud
Join Date: Nov 2001
Location: Close by
Posts: 6,885
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yes
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83 944 91 FJ80 84 Ram Charger (now gone) |
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09-29-2006, 07:21 PM
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Location: Phoenix, AZ
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Re: Blower fan ballast resistor, Trials, tribulations and tips
Quote:
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87 951, K27/6, Almond Beige, 17" Turbotwist 87 944S, alpine white, 5sp died a violent death 84 944, silver/brown, auto, gone but not forgotten "may the force be with you" |
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09-29-2006, 07:40 PM
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Location: Kingsport, TN
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Don't know about the NA but the 951 has thermostats in the resistor area. They can get dirty and prevent the blower from working except at full speed where the resistors are bypassed. Leaves and junk can reduce airflow. The resistors need to be cooled (by the airflow) else they are a fire hazard. Hence, the thermostats. If your car has them (thermostats), just clean them as other posters have said.
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Lawrence 1986 951 2002 SLK32 AMG 1987 328GTS 2011 528i |
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09-30-2006, 04:35 AM
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Location: Viera FL
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Wow, really old post.
2002
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Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann. Ihr Brunnen der nutzlosen Porsche Information |
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09-30-2006, 10:42 AM
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this works just cleaned mine and all 4 settings now work, brilliant
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12-04-2010, 11:35 AM
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Location: Kingsport, TN
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Glad you got it fixed. The least costly fixes that work properly are the best fixes.
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Lawrence 1986 951 2002 SLK32 AMG 1987 328GTS 2011 528i |
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12-04-2010, 11:42 AM
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Glad to hear again that this works, haven't gotten to mine yet but it is on my list!
Rusty |
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12-04-2010, 08:29 PM
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1983 Porsche 944 2.5 liter
Porsche Daily Cruiser
