cds726

The heat/AC only exits the defroster and the floor vents on all settings. Nothing exits the vents in the dash. Also, 1/2 of the vacuum lines in the engine compartment are unattached. Would appreciate a vacuum diagram so I can rectify the problem.

MT-2500

Year make and model and engine?

Is there not a vacuum diagram under the hood?

You will need a vacuum line from engine vacuum to vacuum tank and a line from vacuum tank to heater controls.
There is usually a check valve to hold vacuum at the tank or from engine to tank.
Have you checked th AZ online repair web site?

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Remember proper testing gives us the answer to many problems.
MT