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Unhappy 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?

Old 03-30-2015, 02:50 PM
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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.
Old 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?
Old 03-31-2015, 05:47 AM
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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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Old 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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Old 03-31-2015, 06:07 AM
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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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Old 03-31-2015, 06:25 AM
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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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Old 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?
Old 03-31-2015, 07:14 AM
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Quote:
Originally Posted by david.avrahami@ View Post
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?
My recollection is that if you disconnect the trunk blower motor, a "fail safe" will prevent the footwell blower motors from coming on.

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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Unhappy 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...
Old 04-01-2015, 03:46 AM
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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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Old 04-01-2015, 04:11 AM
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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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Old 04-01-2015, 04:40 AM
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noisy fan motor

yes! this is the noise...beginning of the end...
Old 04-01-2015, 05:02 AM
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I just thought my heater was whining because it was so cold out.
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Old 04-01-2015, 06:46 AM
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Quote:
Originally Posted by david.avrahami@ View Post
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...
The quality of the aftermarket is very poor or you will need to monitor it for 2 years to insure it is working and remember the warranty only applies for the first exchange here.

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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Old 04-01-2015, 06:47 AM
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Quote:
Originally Posted by MrBonus View Post
I was about to make this same thread. I recorded the sound yesterday.


Is this indicative of a dying blower motor?
Ian,

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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Old 04-01-2015, 06:48 AM
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Quote:
Originally Posted by david.avrahami@ View Post
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?
Yes, only when she is moving.

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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Last edited by DRACO A5OG; 04-01-2015 at 07:10 AM..
Old 04-01-2015, 06:50 AM
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Quote:
Originally Posted by 85911 View Post
.... 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...
Just wanted to mention that the 3-in-1 oil should be ok, but they do make one specifically for electric motors. Of course if the fan is too far gone it could be a lost cause.
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Old 04-01-2015, 06:52 AM
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Quote:
Originally Posted by steely View Post
Ian,

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
Dan,

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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Old 04-01-2015, 09:28 AM
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Quote:
Originally Posted by MrBonus View Post
Dan,

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.
Fresh air blower? Off?

If it is the footwell blowers the noise is more likely from the blower wheel having slipped down and contacting the blower housing.

Old 04-01-2015, 10:01 AM
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