Blower not blowing

infj23

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Age
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Location
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Make
Porsche
Model
Cayenne
Year
2014
Miles
135000
Engine
V6
Wow! Been a while since I have had to log in here. For the first time in a while, a problem!
I have a new-to-me Cayenne and the AC/heat blower suddenly stopped blowing. I replaced the blower motor (I now realize that was probably not necessary--lesson learned--maybe) and it still did not blow. A few days later, after the car had just been sitting, started the car and the blower worked as it should. Then, it stopped again.
This was when I realized a pattern. Both stoppages happened soon after taking the car through a car wash. Coincidence or cause?
I connected my scan tool and the various screens that seemed to address this said:
  • Active. Communication with LIN bus (A/C1). At the top of the screen is the number 008452
  • No fault symptom. Check A/C regulator control unit fault memory content. C182
  • Active. Check A/C unit fault memory content C12097
  • Active. Check air conditioner regulator control unit fault memory content. C12097
What do I try now? Thanks in advance for any help and guidance.
David
 

grcauto

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If you put 12 volts on the blower B+ will it work full? If it does nothing we know the ground side is bad. We need to test.
I'd clean the body ground. Do all you can if you have a little time. It's a good idea to do them.
 

billr

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It is certainly a start, but there must be more pages. I don't think the blower in question is even on the page posted.
 

grcauto

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If you have a decent scan tool you can look at what the module is doing.
 

infj23

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I have an ICarsoft CR Pro but it is new to me and I'm not sure I have figured out everything it can do. I just did a scan and here's what it told me:

*Cause of air conditioning switch-off: fan setting too low
*Supply voltage (control unit): 14.41V
*External temperature through CAN: 73.4F
*Interior temperature 80.06F
*Evaporator temperature: 84.92F
*Outside temperature sensor value: 73.76F
*Blower voltage: 0.00V
*Refrigerant pressure: 7.80baf
*Sensor supply voltage: 5.00V
*Engine speed through CAN: 665rpm
*Engine temperature through CAN: 143.96F
*solar intensity: 0 (night time)
*Front blower outlet sensor-Front left side nozzle: 28.70DEC
*Front blower outlet sensor-Front left footwell: 29.80DEC
*Front blower outlet sensor-Front right side nozzle: 28.40DEC
*Front blower outlet sensor-Front right footwell: 29.80DEC

This blower did work, apparently properly, after I installed it new. It stopped working after going through a car wash (which may or may not be related).

Does this help? As always, any and all replies greatly appreciated!
Thanks!
David
 

grcauto

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I have an ICarsoft CR Pro but it is new to me and I'm not sure I have figured out everything it can do. I just did a scan and here's what it told me:

*Cause of air conditioning switch-off: fan setting too low


Does this help? As always, any and all replies greatly appreciated!
Thanks!
David
What do you have the fan set at? If it's on the module don't know it. Bad switch?
Shows blower voltage zero. I'd check that.
The way these are described leads me to think this scan tool is not made in the west.
 

infj23

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The climate control is automatic but can be manually adjusted. The display that shows fan speed operates correctly. For example, starting the car on a warm day shows the fan should be blowing fast. Adjusting up or down changes the display appropriately, but the fan does nothing.

I found a YouTube video that says I need to disconnect the battery after changing the blower, then use the scan tool to tell the car it has a new battery. Does that makes sense? Is that worth doing?

Thanks!
 

grcauto

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The climate control is automatic but can be manually adjusted. The display that shows fan speed operates correctly. For example, starting the car on a warm day shows the fan should be blowing fast. Adjusting up or down changes the display appropriately, but the fan does nothing.

I found a YouTube video that says I need to disconnect the battery after changing the blower, then use the scan tool to tell the car it has a new battery. Does that makes sense? Is that worth doing?

Thanks!
If it needs that I don't know. Haven't done any work on a Porsche.
 

infj23

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FIXED! It's a miracle. Just for fun, I decided to remove the thing that mounts under the blower. Held in by 2 screws with an electrical plug. Thought I might be removing a blower motor resistor, but it was not that. It was Dephi part number 16450176, a heater actuator (I think). Took it off and did nothing but stare at it for a while. Put it back in, plugged it in, started the car, and the blower is working as advertised.
I tried it in all modes, defrost, heat, recirc, set the other side for cooler/warmer, and everything worked like it should.
Don't know why it worked, but I'll take the miracle!
Used my scan tool to clear the related trouble codes, rescanned, and everything came back clean.
So, my guess is the car wash was just a coincidence and not related to the problem. OR! Could the strong blowing air from the drying part of the car wash have blown in through the air intakes and messed up the setting of that heater actuator? Any chance that could happen?
Thanks to grcauto and billr for their ideas!
David
 

grcauto

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FIXED! It's a miracle. Just for fun, I decided to remove the thing that mounts under the blower. Held in by 2 screws with an electrical plug. Thought I might be removing a blower motor resistor, but it was not that. It was Dephi part number 16450176, a heater actuator (I think). Took it off and did nothing but stare at it for a while. Put it back in, plugged it in, started the car, and the blower is working as advertised.
I tried it in all modes, defrost, heat, recirc, set the other side for cooler/warmer, and everything worked like it should.
Don't know why it worked, but I'll take the miracle!
Used my scan tool to clear the related trouble codes, rescanned, and everything came back clean.
So, my guess is the car wash was just a coincidence and not related to the problem. OR! Could the strong blowing air from the drying part of the car wash have blown in through the air intakes and messed up the setting of that heater actuator? Any chance that could happen?
Thanks to grcauto and billr for their ideas!
David
I bet they share a common thread. Possibly a ground.
 

JackC

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My guess: just a poor connection. Un-plugging and re-plugging cleaned it up. Very common with electronics.

Now or next time it fails try diligently cleaning those connections.
 
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