heater blower

[cabman]

i notice the temperatures are starting to drop and I'm having to turn on the heat in my car.

question: when I pull both levers between the seats, should a blower come on to start pushing the air through the vents.

Right now, the only thing that happens after I pull the 2 levers is that the hot air eventually flows inside the cabin, like 5-10 minutes later....is this normal? thanks

[davis911s]

Cabman, you must use the dash levers to get the motors etc to work, the ones between the seats only direct the hot air.

Shawn

[wckrause]

There are two blowers. One is the fresh air blower and it sits just ahead of the dash. It is controlled by the uppper right dash control, and only blows in outside fresh air. It can be directed to either the defrost, center vents, or the floor.

The second blower is the aux heater blower, and it is in the engine compartment to the drivers side of the engine. It supplements the air that gets blown through the heat exchangers by the engine cooling fan. It comes on when you lift the heater levers between the seats. Heated air can be directed to either the defrosters or to the footwell openings, by using the dash controls.

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Bill Krause
'79 911SC Euro
MY PELICAN GALLERY

[cabman]

now i'm confused.


davis911s says the 2 levers between the seats only directs the air but wckrause
says those 2 levers should turn on the blower.
so which one is it? I have a 83sc.
the manual is confusing

does Porsche have a technical support 1-800 # I can call???

[wckrause]

read some of the other threads on this topic. You'll figure out who is correct. You could also look at the schematic for the circuit.



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Bill Krause
'79 911SC Euro
MY PELICAN GALLERY

[JDaniel]

The controls on the dashboard direct the fresh air flow (blower in front trunk w/no heat), and the floor/defroster air direction.

The levers between the seats open/close the flapper, allowing heated air to enter the cabin. It should also turn on the aux. heat blower (although I think's the SC's motor is constantly running).

If you lift the lever and feel no air coming into the cabin, then your motor may either have a fuse blown, be burned out, the blower motor may be missing, or your flapper valves could be out of adjustment. You will get some hot air when the engine is at operating temp and your RPM's are high. Some people say this minute amount is adequate.

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Dan Tolley
1987 911 Coupe
http://www.cheaterswayside.com/911/gallery.asp?sort=0&userid=294

[wckrause]

SC aux blower motors do not constantly run. Why would there be switches and a relay if the motor was meant to constantly run? With the levers all the way to the floor, the aux blower motor should be off.

The aux blower motor was meant to increase the effectiveness of defrost at idle, probably added to meet some safety spec. At cruise speeds, there is more than enough hot air flow provided by the engine cooling fan.

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Bill Krause
'79 911SC Euro
MY PELICAN GALLERY

[RoninLB]

The levers between seats control engine mounted heater blower in my 77, period. The switch goes bad due to dirt, routine repair

[andymin]

On my 77 I have just had my engine blower motor repaired, along with new control valve and exchangers, ducting etc. When the dial (0-9) between the seats is turned the red lever lifts up automatically depending on where you have the dial and warm/hot air comes into the cabin.

The dash sliders are a bit strange, but they just redirect the air onto the screen of footwell or through the vents. Trouble is that my engine blower motor runs all the time and there does not seem to be a way of turning of the heat, except by gently pushing the lever down.

regards

Andy

77 Carrera 3.0 (UK)

[thabaer]

My center tunnel lever is contained in a little black tower with a knob on top. The knob is the "setting" and seems to work with a little red pimple in a perforated black tube near the rear view mirror. The rear blower motor is coupled to the floor lever.

Bill, since we pretty much have twins, I assumed your system would be just like mine. True ?

Charlie


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Charlie Baer
'79 Euro 911SC

[wckrause]

Yes, we've both got the automatic heating system. I believe it was an option.

The aux blower comes on whenever you switch the setting to anything but "0". It isn't tied to lever position.

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Bill Krause
'79 911SC Euro
MY PELICAN GALLERY

[cabman]

$800 for a heater blower motor???

that's the quote I got from dealer..I guess the heat pushes into the cabin eventually and it's something I can live with this winter.

[thabaer]

Mebbe you ought to get some 12V muffin fans for a PC and figure out where to put them. That's been a serious notion in my mind for years when it gets cold enough.

$800!!! When I look at my blower, I think it sure looks non-specific, like it could have some from anywhere, certainly not costing a near Kbuck to get.

Or you could find that really hot date and keep her with you when you have to drive in the cold...


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Charlie Baer
'79 Euro 911SC

[old_skul]

I paid $253 for my heater blower motor here at Pelican. But it's a Porsche OEM part and I don't like using aftermarket stuff on my car.

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Mark Szabo
1986 911 Targa 3.2
1987 Escort 5-speed 1.9 RIP
The Porsche Owners Gallery

[autobonrun]

First, as stated by others, I'd check all my fuses. If they are good, the blower should operate if you cut the ignition switch to the auxiliary power position and pull the levers up between the seats. If it does not, pull the leads from the motor and check that you get 12vdc at the leads and it goes off and on as you change the position of the levers. If you have a switching 12vdc, you know the power circuitry is functioning. I'd try going into the motor before I buy another. Small things like a loose wire, loose connection, sticking brushes, etc. can be easily fixed. It was fairly easy to pry open the covering on my fan motor. Use the voltmeter to check the impedence of the winding to make sure its not open. If it is open, you can buy a new fan or a rebuilt one. I purchased my rebuilt one for $99 several years back. A new one however will probably be more dependable. Most of the winter, my SC puts out enough heat at speed that I don't need the fan. Adding the fan nearly melts leather shoes. Good luck.

[machintek]

I am fighting the same battle. My blower motor is "open". There is no current going through it. The two levers when just pulled up delivers a 12V path the the relay in the engine compartment which in turn can take the high current of the motor. The lever switches are low current devices. Remove the motor connection and when the lever is pulled check for 12 V coming from the relay. If yes check the motor if it is seized or open. If the 12V is not present check for a bad fuse or relay. If there is no coil voltage at the relay you need to go to the lever switches. I do not have the optional type of heat set up. Email me with questions.

George
83 911SC cab/euro

[Bill Douglas]

Hello my friend Cabman.

The blower on my SC is knackered (kiwi talk for it doesn't go any more), what the problem is, is the box between te seats doesn't start the blower motor and fan in the engine bay. The motor could go because if I hook up 12 volts to it everything is ok. Try doing a search as someone had hooked up the yellow wires to a switch on the dash so he could start it up when he wanted.

I just took the fan out of the housing so the engine fan can blow it through more easily. Sometime I may remove the motor as well to loose a few Kg's and to make more room. And just put a alloy plate over the hole.

Where I live it doesn't really get very cold so a trickle of warmth does the trick.

Bill '79SC

[davis911s]

Cabman ( and anyone else)

Sorry for the little confusion, YES BILL is right, I thought you were talking about the blower up front. My sincere and humble apologies.

Shawn

[rcilurso]

You can find these things in the junkyard for $75. Best bet is to get one of the aux blowers from a 964, not the engine blower motor like in out cars. These newer aux motors are the same ones as our engine bay blowers but the bearings are different. That's what fails on our old ones. I'm trying to remember the exact location of the motor in the 964 but I'm coming up blank. I've got one in my car and all i did was take off the mounting thing and reuse mine.

When I pull up the levers my motor comes on. On an 87 those levers do control a switch to turn on the blower. Another strange deal is the round numbered dial down there does nothing till you click to 3. I have found this on several cars. Anybody else?

[thabaer]

I've played with mine at the extremes of outdoor temps. I think it had to be friggin' cold to have the lever rise on the first setting, and if you'd been in the car for a few minutes, your body heat was enough to make it go back down before the engine even started to warm up. (maybe that's an overstatement ;-> ...)

I usually spin the dial myself instead of letting the "thermostat" handle it, the system isn't what you can call sophisticated. Nothing like a dash port with a fan to get a good reading on cabin temperature.


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Charlie Baer
'79 Euro 911SC