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Heater fan noisy
1987 Carrera...my heater blower motor in the engine compartment is very noisy all of a sudden...It starts when the ignition key is turned on.
My question is...if I disconnect its electrical current, will I still have heat? can I use the dial between the seats to have heat coming from the footwell blowers? |
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03-30-2015, 02:50 PM
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Join Date: Oct 2008
Location: Denver, CO
Posts: 3,495
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short version -- you need to replace the heater blower motor -- there's a "failsafe" in place that will prevent the footwell motors from working if the heater motor dies/is disconnected. Searching the forum will show several threads with alternate motor sources for the $$$ factory motor.
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03-30-2015, 02:55 PM
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noisy fan motor
It is noisy for about 15 seconds and then the noise goes away...
is there a way to lubricate it somehow? |
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03-31-2015, 05:47 AM
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Join Date: Dec 2009
Location: Wayne, PA
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David, I had the same issue. I replced mine with one from our host. I am not sure whether or not it is still in the catalog.
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Christopher Mahalick 1984 911 Targa, 1974 Lotus Europa TCS 2001 BMW 530i(5spd!), Ducati 900 SS/SP 2006 Kawasaki Ninja 250, 2015 Yamaha R3 1965 Suzuki k15 Hillbilly, 1975 Suzuki GT750 |
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03-31-2015, 05:58 AM
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I tried to fix and lubricate mine on an 85 911. The bushing on the brush end elongated. I purchased a non-working motor from a fellow Pe!ican and switched end plates. I lubricated both bushings well with 3-1 oil which I have used many times in similar applications. It ran well on the bench. After 4-5 hours of operation, the motor started to seize. It was drawing 17 amps. I think normal is 3-4 amps. Maybe the oil was the wrong application. The bushings resemble "oilite" bushings and maybe don't require/accept lubrication. I was going to try grease, but since this is an important component of the engine cooling and HVAC systems, I decided I needed a new motor- from PP for $175 (requires a connector change).
I have a manual heating system and the footwell blowers will not work without the engine compartment blower being functional.
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1985 911 Carrera Targa, 2011 911 Carrera S 997.2, 1951 Harley Davidson Panhead Chopper, 1957 Harley Davidson Panhead- stock, 1972 Yamaha 250 DT-1(sold), 1959 Austin Healey (Bug Eye) Sprite- sold, 1959 Austin Healey (Bug Eye) Sprite- sold, 1960 Austin Healey (Bug Eye) Sprite- sold |
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03-31-2015, 06:07 AM
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Member 911 Anonymous
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David, Yes, it will work but not your dial settings and only with the levers and at speed.
Most likely one or both of the brushes are low and may have popped out of the guide so the edge is rubbing against the stator. Or the end cap has come loose and there is axial play. I purchased the aftermarket from our host but 2.4 years later it failed ( 2 year warranty ). I purchased a NEW OEM from dealer, it came with a new Fan and housing, correct diameter motor housing and no swapping of the connector, just a re-locate ( one screw ). Disconnect it now, the blower motor could start smoking. Jim
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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03-31-2015, 06:25 AM
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Member 911 Anonymous
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One more thing, the blower motor should not be on if levers are down. You may have a dislodged switch under one of the levers. I would correct that so the blower is not on all the time that will certainly promote premature wear of the brushes.
BTW, my after market one the solder joint on one of the brushes broke off as well, causing the scratchy grinding noise.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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03-31-2015, 06:32 AM
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heater motor
Thanks for your detailed answer...
You mean to say that if I disconnect the motor and raise the 2 levers I will still have heat? |
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03-31-2015, 07:14 AM
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Location: Denver, CO
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Quote:
However, since the two levers between the seats open flaps on the heat exchangers that let heat into the system, you should get some hot air coming into the car -- just no fan assist. I too went with an aftermarket fan, only to have it fail 2 years later. Now running a "factory" fan and hoping it will last |
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03-31-2015, 07:25 AM
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noisy fan motor
I see that you opted to buy the OEM motor after having experience with an alternate...
Porsche offers the whole unit only rather then just the motor...did you opt for that? or you can recommend a motor supplier elsewhere? the OEM is quite expensive... |
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04-01-2015, 03:46 AM
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Join Date: Jun 2013
Location: Park Ridge, IL
Posts: 1,240
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If your foot well blowers are working, you can jumper the engine blower relay in the engine compartment, to defeat that safety feature. The foot well blowers will then be controlled by the 3 speed knob near the heat levers. I don't rremember the terminals to jump, but I found it by search.
Good luck, Dave
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Dave McKenzie 1984 Carrera 3.2 1984 928S Automatic 2001 996TT |
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04-01-2015, 04:11 AM
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Kind of Blue
Join Date: Sep 2010
Location: Delaware
Posts: 2,312
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I was about to make this same thread. I recorded the sound yesterday.
https://www.youtube.com/watch?v=vUms2vGj2aw Is this indicative of a dying blower motor?
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1971 911T w/ a 2.7 (ITBs, EFI, a bunch of other stuff, 2180 pounds with fuel) 2024 Ford Bronco Raptor |
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04-01-2015, 04:40 AM
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noisy fan motor
yes! this is the noise...beginning of the end...
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04-01-2015, 05:02 AM
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Kind of Blue
Join Date: Sep 2010
Location: Delaware
Posts: 2,312
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I just thought my heater was whining because it was so cold out.
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1971 911T w/ a 2.7 (ITBs, EFI, a bunch of other stuff, 2180 pounds with fuel) 2024 Ford Bronco Raptor |
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04-01-2015, 06:46 AM
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Member 911 Anonymous
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Quote:
OEM, has the same warranty but it is built better and less modification and comes with new fan and housing. The reason for the higher price not just the Porsche tax alone. PMed you.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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04-01-2015, 06:47 AM
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Join Date: Aug 2008
Location: sectors R&N, SE Pa
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Quote:
Is your sound coming from the foot well blowers or the engine blower? I only ask because it sounded like the footwells to me since I had that problem, and I didn't have the engine blower problem. The FW's responded to a little cleaning and lube. Dan
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Dan '87 Targa Carrera 3.2 - Fabspeed Cat Bypass, M&K Muffler, SW Chip Venetian Blue |
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04-01-2015, 06:48 AM
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Member 911 Anonymous
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Quote:
But before you start swapping the engine blower motor, you really need to fix the foot blower switches at the levers or you will burn out the next motor in a very short time.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC Last edited by DRACO A5OG; 04-01-2015 at 07:10 AM.. |
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04-01-2015, 06:50 AM
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Quote:
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Dan '87 Targa Carrera 3.2 - Fabspeed Cat Bypass, M&K Muffler, SW Chip Venetian Blue |
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04-01-2015, 06:52 AM
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Kind of Blue
Join Date: Sep 2010
Location: Delaware
Posts: 2,312
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Quote:
I think it's coming from the upper vents, not the footwells, but I'm not entirely sure. I may give them a lube and see if it corrects the issue before I start replacing parts.
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1971 911T w/ a 2.7 (ITBs, EFI, a bunch of other stuff, 2180 pounds with fuel) 2024 Ford Bronco Raptor |
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04-01-2015, 09:28 AM
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Quote:
If it is the footwell blowers the noise is more likely from the blower wheel having slipped down and contacting the blower housing. |
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04-01-2015, 10:01 AM
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First One
Marble Grey
Forever
Whatever
Fasst
