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996 C2 heater issue

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I just picked up an '04 996 with very low mileage. 

The climate control blows only cool air. This usually means the outside temp sensor is bad, however the correct outside temp displays on the dash so not sure that is the problem.

Other suggestions?

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How is the coolant level? Any recent work done on the cooling/heating system?  New tank?  New pressure cap?  New water pump?  The reason I ask is it is very difficult to "burp" the cooling system on these cars.  Make sure the coolant level is correct and open the "burp" valve on the coolant tank by raising the wire to open the valve (the black valve on top of the coolant tank).  Leave it up.   Several  heating and cooling cycles is necessary to remove air from the system.  Always when doing so, put the heat on maximum so any air is forced out of the system.  While doing so, constantly check the coolant level and top it up if necessary.

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Make sure you keep an eye on the coolant level in the tank.  You displaced some air in the system and your coolant level may drop. 50/50 mix of Porsche coolant and distilled water to top it up.  Also make sure you have the latest coolant tank cap...it is blue and the part number ends in 04.  The old caps had a tendency to leak so Porsche updated/revised the cap.  The part number is located on the cap.  Good job!

Edited by DBJoe996
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