found that I had water coming in the zuke when pulling a turn. The water was going into the open vent on the hood and then pooling there due to clogged drains. It took a while before I had time to get to it so when taking off I'd pull a hard turn to the left and then the water would fall on the passengers feet.....as long as my feet were dry it was all good.
Ended up taking the dash off and while it was out I pulled the heater core and vent. Cleaned the whole thing out and it worked like a charm. I actually has heat after. There was over an inch of dirt on top of the heater core.