Hi I have a 1996 Camaro z28 convertible .My dilemma is If I have the air on the air flow nicely from the proper vents at idle or low speeds, yet when I get to higher or cruising speeds the air flow will all but practically stop Any Ideas .This is my first sports car seeing as how my wife and I are now retired and didn't want to go in debt to enjoy some rides Thanks Richard

 

The flapper doors that control where the air flows through the system are controlled by engine vacuum. Most common problem is a broken vacuum check near the vacuum connection on the engine.

Shoebox has the info you need:

http://shbox.com/1/hvac_vacuum.jpg

http://shbox.com/1/vac_check_valve.jpg

http://shbox.com/1/vacuum_tank.jpg

The vacuum port for the HVAC system is on the passenger side of the intake manifold, right above the connection for the fuel pressure regulator vacuum compensation line:

http://shbox.com/1/fp_reg.jpg

 

thanks for quick reply will check and let you know on progress