2003 Mercury Grand Marquis Q&A

2003 Mercury Grand Marquis Question: Heater and AC only blows through the defrost and floor vents.

The control button only reads floor and vent. Floor vent on driver side seems blocked, not much air. -
Answer 1
you may have a blend door issue seek a diag and est -
Answer 2
you need to check your vacuum lines under the dash -
Answer 3
Poss. MODE control motor. -