After i replaced my heater core everything comes out of the defroster in the top of the dash i have no vent or high low. I pulled off the defroster panel and all of the vaccume lines were hooked up so i pulled off the glove box and they all looked good so i dont know what could of went wrong, also it doesnt blow very good at all just a little air i just think it should blow a lot harder thanks for any advice.