Why is my heat only working on one side of the vehicle?

kurt

New member
Okay, so i haven't really bothered looking at it because it isnt that big of a deal yet. Though, it's getting colder so i was wondering, i have heat on my passenger side only and cold air blows out the driver side. Is it a bad thermostat or is it heater core or what? It's a 2002 Dodge Ram 1500 if you need to know that also.
 
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