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Can you be more specific about what is meant by "AC clutch is not engaging?" I'm wondering if it makes a click, indicating that the magnetic coil as activated, but the clutch surfaces are not coming into sufficient contact to grab. I've seen this happen when the clutch has been installed incorrectly, as the tolerances are small. A missing washer in the assembly can throw the whole thing off.
I suspect the problem may be more simple, though. If the A/C system is low on R134a, then the clutch will be prevented from engaging by the low pressure cutout switch. If that's all it is, then injecting some R134a into the system should raise the internal static pressure enough to override the low pressure cutout switch and let the clutch engage.
Regarding the second question about the dash vents: if the air does not circulate to the dash vent only when the car is pulling a high vacuum (e.g., under acceleration), then check out the recent post from bcg for vent air goes to floor when accel--bad a/c check valve. It has some links to the faq describing this symptom and diagnoses for possible causes.
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