Ventilation problem is probably the Blower Resistor Pack. This is located on supply air duct just above front passengers toes. about edge of carpeting. Buy the new unit first so you know what the connector end looks like as the main body is buried in the duct. Needs a small hex wrench; I cut slots in screw heads for ease of re-assembly and future changes.My 2001 Malibu's control ventilation-force of air has stopped working on level 1 & 2 of 5. Also, front end shakes when I get to about 65 mph. Anyone have a solution? thx
A speed specific shaking is usually a wheel balance problem; if balancing does not fix it check tie rod ends first then Suspension ball joints.