I recently purchased a 2004 Cayenne Turbo.

Since I live in Colorado, heat is important this time of year. I took it for a test drive, after taking delivery, and there is no cabin heat. The engine temp is at 180 but it's blowing nothing but cold air through the vents. This is on both driver & passenger and all vent positions even with the control set to "HI" on both sides.

The coolant level is fine.

What could this be? Does the '04 Cayenne have a heater control valve? If so, where is it located so I can test it?

What else should I be diagnosing?

 

There are heat sensors in the vents as well that you will need to test.
PIWIS will tell you if you have a sensor issue.

 

Hooked up my new Durametric and the following HVAC codes were stored.

2100 - Servo motor for footwell flap
1809 - Drive motor for temperature valve left
657 - Servo motor for central vents
1592 - Air quality sensor: Open circuit/short circuit to B+
1336 - CAN comfort OFF: No signal/communication

Can anyone tell me if there is a common issue here that would lead to all of these faults?