In my 1999 ml430 when I turn on heat it blows cold air what can I do on 1999 Mercedes-Benz ML430

I changed cabin filter still blows cold air what's next

by in Brooklyn, NY on December 09, 2013
2 answers 3 comments
ANSWER by on December 09, 2013
Replace the thermostat, it is probably stuck in the closed position.
COMMENT by on December 09, 2013
Where is thermostat
ANSWER by on December 09, 2013
could be blend door stuck open
COMMENT by on December 09, 2013
What is a blend door???
COMMENT by on December 09, 2013
It's a door inside the HVAC housing that controls the airflow through the heater core and A/C evaporator , to regulate air temp. Cabin filter - filters air. Stuck closed thermostat would cause overheating. CHECK coolant level first , and make sure the engine is reaching proper operating temp.

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