Today I found that my climate control system was blowing air only through the defroster vents and the floor vents. No setting produces air through the dash vents. Where should I start?

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2001 Bonneville SSEi. 1598xx mi.
great car. Wrecked


Burnt Bonny.

Note if you pull the injectors to obserbe fuel delivery...make sure you leave the plugs in and disconnect the ign. Believe me

Check the vacuum lines,mine did this after I changed my plugs and I must have knocked one of the lines near the firewall loose.It popped off a few days later and I had the same issues you are having..

Thanks for that Pontiac1! That makes a lot of sense. I know just which one to look at to start too.

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2001 Bonneville SSEi. 1598xx mi.
great car. Wrecked


Burnt Bonny.

Note if you pull the injectors to obserbe fuel delivery...make sure you leave the plugs in and disconnect the ign. Believe me

Hey thanks Pontiac 1! My tube from the engine vacuum multi port to the firewall (Heat/AC system) hose was disconnected. The climate system works well now except for the refrigerant I need to put in. This hose comes off frequently when working in that area. The nipple the vac hose fits over is tapered to a point at the end. I've tried hose clamps and sanding down the fatter end and the hose keeps coming off. Would a JB Bond lip around the small end let a hose clamp keep the hose in place?

_________________
2001 Bonneville SSEi. 1598xx mi.
great car. Wrecked


Burnt Bonny.

Note if you pull the injectors to obserbe fuel delivery...make sure you leave the plugs in and disconnect the ign. Believe me

If the line does not stay on it probably needs to be replaced,you could try a plastic zip tie to hold it in place.These lines dry out, the connections loosen up from heat and need to be replaced sometimes.