I have a 98 grand prix with auto air and dual climate control. I can not change the air flow through the vents. I have located the vacuum solenoid manifold under the dash that appears to control the flow of vacuum. I ran a test light to each lead that shows power for different air flow modes. How do i test that part? am i looking in the right direction or should i be looking somewhere else for the problem

Christophe Thompson

• 1224 Answers
• Posted on May 31, 2008

SOURCE: No Air Output At Dash Vents

linkage inside dash or relay for electric front vents went bad
linkage sometimes comes off its holder from usage this is normal there only held in by a upin under the dash
if electric the relay for the the top vents needs replacing this i believe will be with rest of the relays in engine compartment

Marvin

• 85242 Answers
• Posted on Mar 17, 2009

SOURCE: i need to locate the map sensor on my 98 grand

Your engine doesn't use a MAP sensor (Manifold absolute pressure), it uses a MAF sensor (Mass Airflow), they both provide the same information about engine load but in a diff way. here is a picture of your sensor.

SOURCE: celcius to farenheit

If you take the control assembly out of the dash and look behind it, the connector has a black wire in position D7 (little letters and numbers are printed on the connector). This wire will have a connector on it, pull this connector apart and your display will now be in *F

SOURCE: 2006 Pontiac Grand Prix Dual-Climate Control Light Issues

The lighting in the A/C control head is not serviced. If you want it repaired you will have to but a control head. Good Luck

SOURCE: no air flow from middle level vents

no actuator is electric motor maybe bad or switch control or jammed door!!! :)