My heater blows cold air I flushed and changed the coolant and replaced the thermostate
Friday, January 14th, 2011 AT 3:40 AM
Check the heater core, heater control valve and the air blend door.
Friday, January 14th, 2011 AT 3:56 AM
You may have an air bubble stuck in the heater core. Also the heater control valve might be stuck if you back - flushed the system without removing it. The thermostate might not be any good, & needs to be tested to see if it opens.