I recently did a complete restoration of the AC system in my '89 Mazda RX7 turbo. Purchased a rebuilt compressor (Nippon Denso model), new receiver/dryer and new expansion valve. Old compressor finally seized up. Also replaced all O-rings & properly flushed out all the reused components (hard li...

If the drain tube is clear, not kinked or otherwise clogged with debris/mold, another possibility is the evaporator box was not properly installed in the car to begin with (i.e., plumb & level, so the condensate water flows towards the drain tube). Sometimes the design of the box itself, plus an...