It will only blow warm and it will only blow if its on the highest level, and after 10 or so minutes of blowing warm it will start blowing cools air, but after a few mins of blowing cool air it will start blowing warm air??? Any ideas
plugged heater core. reverse the cooler lines going to the core at the engine hard lines. let it run that way for awhile and if heat comes good that means plugged cooler. this is a temp fix and lines can be switched back after it unplugs it.
Chris probably nailed it. That'll clean in the pipes.
If you want to check the fins, you can pull the blower motor and stick your hands up in her. You can wash it out with a spray bottle and let it drain out the tube in the firewall. Just in case the air is going around the fins and not through them. The blower motor screw in the back is a beotch. Enjoy.