Different Heater Problem

[Dircon]

My 2001 C5 Exclusive SE V6 has an annoying problem with its Climate Control.

 

As the car warms up all Vents: Foot, Face & Windscreen, increase Temp' together.

 

However, once the car begins to get warm the Face & Windscreen Vents begin to blow steadily cooler air.

 

By the time the car is fully warmed up the Foot Vents continue to blow air as hot as I wish. Whereas, the Face & Winscreen Vents are nearly Cold.

 

If I increase the Temperature setting, the Face & Windscreen will blow warm as the Temp' increases. But, will soon revert to a cool draft.

 

If I set the Temp' to 28%, then all Vents blow Hot.

 

I can direct the air to any Vent with no problem, and the Foot Vents can be adjusted up and down exactly as required.

 

I have Duel Zone, and both side behave in the same manner.

 

I am stumped. Surely, if the Flaps were faulty, I would not be able to set the Temp', or choose the direction of air outlet.

 

I am worried that if I take it to a dealer, they will charge me a fortune in diagnostic time.

 

Any ideas please.

 

The Cold weather is coming.

 

Thanks in advance,

 

Paul

[paul.h]

If it was not for the foot vents getting hot, you might think a temperature sensor is faulty but to check would need a diagnostic or just replacing the part. On one of the C5 sections is a pinned post of members able to help with diagnostic checks so you could see if one is near you.