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911 carrera 3.2 (1985)
Join Date: Sep 2001
Location: Harmelen, the Netherlands
Posts: 741
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Fresh air blower motor
 When the lever B is in the extreme right position I should have maximum ventilation (ignition key to ACC) and hear the blower motor. Right? Well, I don't hear anything. The only thing is that the ventilation sign is lit in position I en II (engine off). It is out in position III (engine off) and when I start the engine it doesn't light in position I, II and III. So far the only thing I've checked is the fuse which is OK. Please help. What is (could be) wrong? Kees. - 1985 carrera coupe (euro). |
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05-17-2005, 07:40 AM
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Registered
Join Date: Nov 2002
Location: Arlington, VA
Posts: 1,045
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Quote:
Free bump.....
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Charlie Stylianos 1982 SC Targa www.Dorkiphus.com - (The Land of the NoVA/DC/MD Porschephiles) |
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05-17-2005, 09:04 AM
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Registered
Join Date: Nov 2004
Location: Greater Metropolitan Nimrod, Oregun
Posts: 10,040
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or maybe the switch or fuse or...
trying hot wiring the motor to make it come on to help troubleshoot but 1st push the lver over and get out and open the hood, stick your head near the blower - maybe it is a real quiet one...
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"A man with his priorities so far out of whack doesn't deserve such a fine automobile." - Ferris Bueller's Day Off |
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05-17-2005, 10:36 AM
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Virginia Rocks!
Join Date: Oct 2003
Location: Just outside the beltway
Posts: 8,497
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Quote:
Yours should be like mine - one lever on top. And it should come on and it makes a lot of racket.
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Rosewood 1983 911 SC Targa | Black 1990 944 S2 | White 1980 BMW R65 | Past: Crystal 1986 944 na Guards Red is for the Unoriginal
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05-17-2005, 12:21 PM
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Join Date: Aug 2003
Location: Lake Grove, Long Island, NY
Posts: 658
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If you need a new blower, I have two.
I believe there is also a relay involved here. check the wiring diagram
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05-17-2005, 12:39 PM
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I had the same symptoms, it was a bad motor.
If you remove the cover in the trunk and disconnect the connector from the motor you can check if you have everything works up to the motor. The connector have (IIRC) 4 pins, 1 12 volt and 3 others. The others connects to ground depending on which fan speed is selected (only one of the 3 to ground at the same time). If everything checks out its the motor. A new one is about $100 (I think) if you cant get it rebuilt, I bought one directly from a Bosch dealer.
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Magnus 911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI. 911T Coupe -69, 3.6, G50, "RSR", track day. 924 -79 Rat Rod EFI/Turbo 375whp@1.85bar. 931 -79 under total restoration. |
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05-18-2005, 03:07 AM
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Registered
Join Date: May 2004
Location: SK, Canada
Posts: 419
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Yup, mine was bad too. I tell you though, the stupid thing is LOUD when you get it fixed
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05-18-2005, 06:14 AM
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Registered
Join Date: Jul 2002
Location: Southern California
Posts: 5,067
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I'm not certain the thread involved the blower motor, but there was a thread within the last year or so by someone who fixed something in his ventilation system with a motor from www.grainger.com. Apparently is was a LOT less expensive than the factory part, and not too difficult of a job. IIRC it was the blower motor, but I'm not sure. Do a search if you're interested.
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1984 Targa |
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05-18-2005, 06:55 AM
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replaced my wiper washer valves about a year ago..disconnected the blower ducting to gain access..didn't feel air coming from my blower the next time i used it..checked fuses..hmm? ohhhhhhhhh..the ducting was still disconnected, forgot to reattach. check for continuity of your ducting unless yours has worked fine in the past and you haven't done work up front lately..
ryan
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To the memory of Warren Hall (Early S Man), 1950 - 2008 www.friendsofwarren.com 1990 964 C4 Cabriolet (current) 1974 911 2.7 Coupe w/sunroof 9114102267 (sold) 1974 914 2.0 (sold) |
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05-18-2005, 08:52 AM
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Senior Member
Join Date: Sep 2001
Location: Chesapeake, VA
Posts: 1,699
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My 70 does the same thing, I believe it is actually the contacts in the controller. My motor runs when jumped to all three motor speed contacts. Easy to pull the bits and pieces to check, just takes time.
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Chris 1988 911 Carrera Targa (driving project started JAN 2022) 1970 911E - Long since gone 1972 911 Targa - gone 1987 911 Carrera - gone Retired FA-18C Driver |
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05-18-2005, 06:54 PM
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Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
Posts: 21,140
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fwiw.. I believe my yr doesn't have a fuse on that motor. I haven't gott'en around checking and adding a fuse yet.
If I'm right it's a real bad circuit design without one.
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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05-19-2005, 05:12 AM
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911 carrera 3.2 (1985)
Join Date: Sep 2001
Location: Harmelen, the Netherlands
Posts: 741
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fresh air blower motor
Thanks to all of you.
I checked everything and I'm sure the motor passed away. Kees. |
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05-19-2005, 05:19 AM
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I just did this repair and it wasn't too difficult. However, I noticed something very Porsche about the control units with the two upper levers. One would think that the "A" (left) lever would control the amount of fresh vs. recirculated air, but it doesn't. It controls two "flappers" that regulate the amount of air, but they are after the blower fan. So if you run the fan (B lever to right) and have the "A" lever to the left you are just blowing air at the closed flapper valves. I thought that was odd if not a useless, redudant control. Just my opinion, I am sure the Porsche climate control engineers had a reason
 Andrew
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'88 Carrera Cab 3.2 Diamond Blue Metallic - ERP Polybronze Bushings, ERP Monoballs, SW Chip, Bilstein Sports, 930S Steering Wheel, DAS Rollbar, Sparco 5pt Harness, Hunsaker Sport Seats, Dansk Pre-Muffler, MK 1in-1out Exhaust, Magnecor KV8.5 Wires '86 944NA, Sunroof Delete, Track Rat, Full Cage '72 914 1.7 Guards Red / '02 Audi S4 Light Silver Metallic |
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05-19-2005, 05:34 AM
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Nope, the Porsche doesn't recirculate any air. The A lever just regulates the amount of fresh air. Going at highway speeds you usually don't need the fan at all.
If only I had known when I bought my Porsche that I could shut off the fresh air with that lever. A 32 mile ride in December and no working heat is not recommended.... Edit: December in Sweden means below freezing temperatures.
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Magnus 911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI. 911T Coupe -69, 3.6, G50, "RSR", track day. 924 -79 Rat Rod EFI/Turbo 375whp@1.85bar. 931 -79 under total restoration. Last edited by safe; 05-19-2005 at 05:52 AM.. |
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05-19-2005, 05:48 AM
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1977 Porsche 911 Targa 2.7s
1974 Porsche 911 2.7
1988 Porsche Carrera Cabriolet 3.2
