Any thoughts on why the rear ventilation system will only flow through the lower ducts? It flows hot and cold well, but after pressing the upper flow button, the air stops flowing through the bottom and will not flow through the upper vents.
The rear vents are for A/C only, there is no heat exchanger for the rear section. All warm hot air is generated in the front air exchanger. The best way to warm the back of the vehicle is using the floor vent setup.
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