Which blowers motor turns on with red levers

[jgurnari]

Which blower motor is turned on when the red levers between the seats are raised?
Foot well blowers motors?
if so, do the foot well blowers each have their own fuse?
I am not get any blower motor turning on when I raise the levers OR turn the dial on Heater controller.

[ian c2]

Iirc .
the foot wells are not fused but the Engine blower must be good for them tO work , and this is why you must fit a resister to mimick the rear motor to keep the foot wells working when you backdate the engine bay .

[Jack Stands]

If it’s a stock system, rather engine needs to be running. Though the footwell blowers are not fused from the factory, adding a ATO fuse on each is an appropriate safety modification to make.

[Lyle O]

What year is your car? The factory installed 10 amp in-line fuses for the foot well blowers (on their wire harness jumpers) beginning from April of 1986. If your car is an '87 or later, you should already have the fuses, so check there first if they are blown. These motors are notorious for freezing up over time, and would blow the fuses (or worse, if the fuses were not present), so check the blower motors themselves. After that, check the main heater blower circuit in the engine compartment.

[HaroldMHedge]

Early footwell blowers were not fused. Fuses were added beginning April 23, 1986 as documented in TSB 8704, Fuses for Additional Heater Fans dated August 12, 1987. This TSB applies to both the 911 and 911 Turbo.

In my 87 manufactured 11/86 the fuses are modern ATO/blade type fuses.

Edit
Thanks Lyle O, you beat me getting this information posted.

[brianlay]

Rear blower, if you have one, should run as soon as either red lever is cracked open.
A working rear blower is required for the footwell blowers to run unless the control relay has been jumpered.
The speed switch on the heat control console has 0 (off) and 1 tied together, there is no off, only low speed

[jgurnari]

I have an 86 carrera coupe

[jgurnari]

Rear blower is not turning on when I raise the red levers between seats. If the foot well blowers don’t have fuses , Could it be the blower relay in the engine compartment? Or the switch within the lever housing?

Originally Posted by brianlay

Rear blower, if you have one, should run as soon as either red lever is cracked open.
A working rear blower is required for the footwell blowers to run unless the control relay has been jumpered.
The speed switch on the heat control console has 0 (off) and 1 tied together, there is no off, only low speed

[brianlay]

As do I. And a rear blower?

[brianlay]

Yes, it could be any of those, but best to troubleshoot

Using a test light, confirm 12V at the fuses on the relay panel in the engine compartment.

If OK, then pull the connector off the rear blower and use a test light to check for 12v and ground at the connector when you pull up the levers and the key is on. You might be able to hear the relay clicking.

If you get 12v, the motor is bad. (my guess)
If not, then start working back through the relay and the lever switches.

My general preference in troubleshooting is to make measurements that don't require taking things apart and then going deeper as needed.

Forget the footwell blowers for now, they won't work until you get a working rear blower that is drawing current.