I just started driving my winter car and there is no heat and its hard to get it to defrost in the morning. I have had this problem with the other black tgp and it seems to have cleared up on that car.
Should I just flush the coolant or can the heater core be flushed seperately and more effectively? what would be the first thing to check here? I flush all the cars regularly and keep coolant mixtures so there should not suddenly be a bunch of corrosion