Here is an annotated diagram of the HVAC heater/evaporator housing that may be of some help:
In addition to the blend
door there are panel/floor
doors. If the panel/defrost door were stuck in the defrost
position--no vacuum applied--air could not flow the panel vents regardless of the control knob selection.
- 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.
New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq