No Heat

1999 GMC

my heat would at first was working then it started coming on when it wanted to. for the past three days it has not came… Read More »1999 GMC

2001 lincoln navigator

heater blowing cold air in front but heat in back coolant level is full what is the problem

1999 Chevy Silverado 2500

Cannot get the air to move between the different setting. Defrost to floor. Stuck in between and not much air coming out.