my 2002 nissan quest heat hasn’t been working properly for a while it only get hot when driving. at idle it gets back cold.. after i took it to the mechanic for a misfire problem. i told them about the no heat problem. so they flushed the heater core, changed the thermostat and water pump. after all that it was the same thing so they told be the heater core is clogged and has to be changed but after hearing the quote i decided to take the job on myself. i changed out the heater core and the problem is still there. could it be another bad thermostat ?. please help
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