My 2002 dodge ram is ove heating I change theromstat still over heating seems like the water not going throu the engine help.

Phosphate scale (mineral build-up), from not using distilled water, may have developed in the radiator. Only use a 50/50 mixture of the proper antifreeze and distilled water. Try flushing the cooling system. If the problem persists, you may need to replace the radiator.