I have a 1990 Cadillac Brougham D'Elegance 5.7 RWD and I can't get the hot air to come out of the window vents on any settings on the heater. My heater works great, just changed the water pump and heater core about 1 month ago. It wasn't working prior to that either. I have changed the egr valve and map sensor already as well. Side note, I would love to find a great Classic Caddy mechanic in New York City as well, if anyone knows one. I've gone to 6 different places and no one wants to look at it. Please help, Thank You!