heater sometimes dont work, it work on and off on 2006 Dodge Grand Caravan

and unusual sound i heard in the engine, but my van still drives great except its cold with no heat.

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2 answers 3 comments
have someone check the cooling system.
its blowing cold air!!!
I got lei'd in Hawaii, it is warmer there.
ck coolant level in radiator the poss thermostat or heater controls or plugged heater core, could be all these
thank you, thats very helpful