Footwell blower

[frankoporsche]

Hi
I have an 1986 Porsche 911
I know there is five fans in this car..
So far I have tested by using the battery power to check all five fans and it works fine. Except I had to repair the auto heater blower switch the one control the engine heater blower..does Off and On
only three heater blowers work except right and left side foot well blower..
Question is does is have the relay? which of the switch that the turn on those foot well blower
have not yet check the heater fuse,,the is my next step ..thanks

[86 911 Targa]

Originally Posted by frankoporsche

Hi
I have an 1986 Porsche 911
I know there is five fans in this car..
So far I have tested by using the battery power to check all five fans and it works fine. Except I had to repair the auto heater blower switch the one control the engine heater blower..does Off and On
only three heater blowers work except right and left side foot well blower..
Question is does is have the relay? which of the switch that the turn on those foot well blower
have not yet check the heater fuse,,the is my next step ..thanks

^^^^
Here is the heater relay located in the engine compartment-Driver's side.


^^^^^
Here are a few "Hints).

In order for the foot well blowers to work, the engine compartment
heater motor must be on.





^^^^^
Also a possible concern.

Good luck,

Gerry

pm me as needed

[86 911 Targa]

^^^^^
Relay & Location.

Gerry

[frankoporsche]

Question
Auto heat control regulate footwell heater motor speed?

[86 911 Targa]

Originally Posted by frankoporsche

Question
Auto heat control regulate footwell heater motor speed?

No,

The foot well blower speeds are controlled by the console mounted rotary switch.



^^^^^
Here.

Gerry

[frankoporsche]

Okay
here is what I got so far,,every things I tested did passed...no failure
what is next?


I plugged the relay back in and turn the key on engine at start mode and lift the red level up for rear blower motor to come on ..and rotate the rotary switches control the footwell still is not working

well there was something I am not sure if this is right..When I jump the wire from the pin 3 and 4 together, the footwell motor was running at slow speed on position zero .than I rotate to position 2 the same speed,position med ,it got faster and rotate max even faster .is the Okay

[86 911 Targa]

Originally Posted by frankoporsche

Okay
here is what I got so far,,every things I tested did passed...no failure
what is next?


I plugged the relay back in and turn the key on engine at start mode and lift the red level up for rear blower motor to come on ..the footwell not working

well there was something I am not sure if this is right..When I jump the wire from the pin 3 and 4 together, the footwell motor was running at slow speed on position zero .than I rotate to position 2 the same speed,position med ,it got faster and rotate max even faster .is the Okay

Need Footwell Blower Assistance
^^^^^
Have a look at this thread.

Also, shorting pins 3&4 bypasses the relay.

You need to find out why that relay is not engaging.

Gerry

[86 911 Targa]

^^^^^
As per my post, I don't recommend this,
or, shorting pins 3&4.

It would appear that you are missing the
ground to pin #2, or 12v to pins 5-6-7, or 8.

The 12V to the Reed switch coil next to the relay
(right side), activates the Reed switch,
as shown in the pics I sent.

Gerry

[frankoporsche]

there is a guy Porsche owner have the problem as mine
his login names "Ramp"

[frankoporsche]

Hey Gerry
I did some more tested .... I disconnect the autoheat control plug from engine bay harness and I power up 12 volt to auto switches ,the footwell motor came on...


I have two switches ,what are they and do?
I connect the 12 volt to the wires ,white/blck trim and black ( white switches) and the footwell motor works

I double check
The funny part is ..I bridge the wire to pin 3 and 4 the auto switches works ,I was able to change the footwell motor speed
PS I did bypass the relay no change

[86 911 Targa]

Shorting pin #'s 3&4 bypasses the relay.

Shorting the black/black white wires bypasses the rotary switch.

Contact "Ramp" & see how he did.

G.

[frankoporsche]

Originally Posted by 86 911 Targa

Shorting pin #'s 3&4 bypasses the relay.

Shorting the black/black white wires bypasses the rotary switch.

Contact "Ramp" & see how he did.

G.

Hi
By doing this what Ramp did ..does is eliminated the motor speed on rotate dial switches?

[frankoporsche]

Ramp posted this from the beginning #1 ( Pin 9 to Pin 7 = 12v with levers up. Levers down actually had .07v, not fully zero)
afterward #2 (Pin 9 to Pin 7 = HAS 12V REGARDLESS OF LEVER POSITION)
Now I am confused..so far item one is what I have now..

[86 911 Targa]

Originally Posted by frankoporsche

Ramp posted this from the beginning #1 ( Pin 9 to Pin 7 = 12v with levers up. Levers down actually had .07v, not fully zero)
afterward #2 (Pin 9 to Pin 7 = HAS 12V REGARDLESS OF LEVER POSITION)
Now I am confused..so far item one is what I have now..

pm sent.

[frankoporsche]

Thanks Guy......
I found the problem ..it was the heater relay...you have to open up inside the relay and see if any bad solder or contact point...between the pin#3 and 4