if you change thermostate in dodge 3500 and the heat still doesnt work
have to make sure thermostat is good 1st .check antifreeze make sure looks clean if all the above is good.you will need to flush your heater core more than likely pluged up.I had to have it done on mine even after replacing radiator.
Search Dodge Ram 3500 Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Dodge Ram 3500 Experts