Blend door may be stuck or heater core is clogged .
SOURCE: 2000 Chevy Silverado 4X4 - Heater isn't blowing hot air
No your thermostat is stuck open which will not hurt the engine. but needs to be replaced, the thermostat is what allows the engine get up to operating temp. before allowing water to flow through the radiator and when it is stuck open it doesnt allow the engine to reach operating temp. so the heater never gets hot. I hope that helps you out.
SOURCE: Ford Expedition 2002 Front Heater blows cold air below 45 MPH
impeller is made of plastic on teh water pump and its slipping and spinning on the shaft renew before weather warms up as engine will overheat
SOURCE: heater is blowing but its cold air not hot air 2000 expedition
Make sure the heater core is in the open position by using the shut off valve and turning it to open. next, you may have a malfunction in the direction door the directs the air flow in the dash. a lever may have become lose or separated. may be a bad servo motor not directing the door to move to the heater position. i would start by checking that shut off valve first on the heater core.
SOURCE: Toyota Celica gts 2000 blowing cold air when heater is on.
nothing try back flushing heater core, they clog up due to litle water preasure,you might want to flush cooling system if you already havent, hope this hleps.
SOURCE: heater is not working, just blows cold air... on
check coolant level if thats ok check the control valve for the heater matrix as this could be stuck shut hope this helps
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