[chembrad]

Check your heater core for flow through.

Pull off the in/out to the core and try to blow through some compressed air. You will know real quick what the problem is. If the coolant comes shooting out, then your core is not clogged. If nothing or very little comes out, then it is your core.

If you (or someone else) have ever used that "stop leak" crap in your coolant, then you can bet it is the core. Sometimes you can blow it out. Try REAL hard.

The core is a pain to replace, but if you just use your shoulders to lift the loosened dash while replacing the core, then you won't have to remove the entire dash like the manual says.

Watch carefully how your airflow baffles are put together. Putting it back together from complete disassembly is the worst part... Don't do it!

FYI: if your radiator is leaking, just replace it... don't use the stop leak, You are only making your repairs worse down the road.

Radiator is simple to swap. The heater core is cheap, but labor intensive.