What would cause A/C coolant to not be drawn into the system during recharging? I tried recharging my A/C system, since it is completely dry, but the compressor would not engage and the coolant was being pushed back thus escaping from the can. The Previa is a '92 and the A/C was working fine until last summer when it stopped cooling. In checking, there was no coolant left in the system.
Thanks!