Was thinking of breaking out my AWD Caravan in the snow today, but it has some heater issues. For one, it doesn't seem to get much heat out of the vents, which I think is the heater core, as one hose is a good bit cooler than the other. Any good ways of flushing it? Any kind of flush or acid or whatever I can pour in it and soak it? Or just some kind of cooling system flush? I've used a few different brands from the parts stores but haven't ever had great results. Granted they were always the 10-12 dollar bottles.
Other issue is it won't switch to the defroster vents in the top of the dash. Seems to switch to the others okay. Cable need adjusting, or something else?