1985 911 Turbo -- heating controls confusion???

[solarispete]

Hi all,

Recently purchased a 1985 911 Turbo.
Tonight was first time I actually turn on the heat since it was a bit cool.
Was using the three levers:
Shifted top lever (air control) to II (top shift)
shifted air direction (middle lever) to ^ (windshield)
third lever to left (no defrost).

Air was cold (understandably since the engine started cold).
While engine was warming up. I turned the control knob (the floor knob
between the seats) to 1... After about 30 seconds I smelled smoke... Another
30 seconds I can see some smoke from under dash! I had to open window
quickly. I then drove to gas station and turn control knob all the way to defrost
and the smoke cleared and started to return to normal. I can feel some warm
air under my seat.

Can someone tell me what I am doing wrong? And why is there smoke? How
does the Porsche's heating work? The controls are quite confusing.

Thanks in advance for any help/suggestions.

Another question: What is normalgas milege for a 1985 911 Turbo? Mine is
definitely gas guzzler 12 miles/imperial gallon???!! ( I am wondering if I need a tuneup soon ) ...

Peter

[WPOZZZ]

Your heat controls are by the hand brake. There are 2 levers that open up the cutoffs and the knob tells it how much heat to bring in.

[solarispete]

Thanks Bryan,

Yes, that's what I gather, the heater controls are behind the hand brake on the floor.
I turned to 1 tonight and started seeing and smelling smoke. When I turn the knob
all the way to Defrost, the smoke went away.
I wonder how heat is done in a Porsche? And why does it smoke at 1?

Actually on the turbo 911, according to the manual there's a knob (1-2-3 positions) left of the control levers on the dash. It says at heater level 8-9, this knob has control of airflow, but I don't notice any difference.

Any thoughts?

P

[WPOZZZ]

The heater valves are hooked up to a heater box built off your exhaust manifold. There may be some crud built up in the boxes or valves that flew into the vents. Did your smoke smell like something was burning? If so, there is a chance your car still has the old style paper ducts coming off the heat exchangers. Those were changed as they do catch fire. My 86 still had the paper ducts which were removed and capped as I don't need heat in Hawaii.

[woland]

I had smoke coming from the dash in my 1980 SC and the problem was the electric motor of the front blower: it was out of lubricant (obvious after 30 years). So I cooked it.

If I would have switched off and lubrified maybe I had not to change it.

Verify if the front blower (upper right lever on the center dash) or the rear (red knobs near the parking brake) make strange noises as "weeeeeeeeeeekk!" or "wiiiiiiiiiiiiiiiik"

[Rot 911]

[wwest]

Originally Posted by solarispete

Hi all,

Recently purchased a 1985 911 Turbo.
Tonight was first time I actually turn on the heat since it was a bit cool.
Was using the three levers:
Shifted top lever (air control) to II (top shift)
shifted air direction (middle lever) to ^ (windshield)
third lever to left (no defrost).

Air was cold (understandably since the engine started cold).
While engine was warming up. I turned the control knob (the floor knob
between the seats) to 1... After about 30 seconds I smelled smoke... Another
30 seconds I can see some smoke from under dash! I had to open window
quickly. I then drove to gas station and turn control knob all the way to defrost
and the smoke cleared and started to return to normal. I can feel some warm
air under my seat.

Can someone tell me what I am doing wrong? And why is there smoke? How
does the Porsche's heating work? The controls are quite confusing.

Thanks in advance for any help/suggestions.

Another question: What is normalgas milege for a 1985 911 Turbo? Mine is
definitely gas guzzler 12 miles/imperial gallon???!! ( I am wondering if I need a tuneup soon ) ...

Peter

With that rotary switch in the FULL-ON position then full battery voltage is applied to the two, L & R, blowers. In any lower position resistors are used in series. Find the resistor set and the associated mouse nest/debris it is HEATING when in use.

Turbo engines have a lower than optimal, insofar as simple cruise is concerned, base/native compression ratio. Lousy hwy mileage as a result.