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Heating and Ventilation

Vehicle Information: Model: 911; Year: 1988; Body Type: Convertible; Engine (type, size, modifications): 3.2; Total Mileage: 77K;

Can you clear up some questions regarding the HVAC system on my 88 Cab please?1. With the fresh air fan on and the upper left lever on the panel pushed to the right(center), the fresh air vents to either the windshield or the floor based on the position of the center lever. If the upper left lever is all the way left, should I be getting fresh air out of the center vents? Currently I get no airflow out of any vent when the upper left lever is all the way to the left despite the fan running.2. Is there a spec sheet that tells what the center vent AC temps should be vs outside air temperature for the stock AC system? My 928 manual has a series of nicely laid out charts like this as a starting point for AC diagnosis. The best I get running R-134 is about 65 degrees when it is in the high 80s outside. Also the volume of air out of the center vents is much less than the volume of air out of the side vents.3. If neither my engine compartment heater fan or footwell fans work where can I start diagnosis? I get plenty of heat out of either the windshield and footwell vents depending on the position of the lower red lever on the panel and the red levers by the emer brake up only when the car is moving. Once I stop, the airflow is significantly reduced. The 0-3 rotary switch by the red levers and emer brake do nothing.Thanks!

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