To troubleshoot this types of problem,click the link below :----http://howtobyme.blogspot.in/2012/02/heater-blows-only-from-defrost.html
--------Go through the procedure to confirm the issue.------
Engine Overheats and heater blowing cold?http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html
---------Heat blows cold on drivers side and hot on passenger side?http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html
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This will help.Thanks.
I flushed my heater core and it worked that day ....then it blew cold th' next day and what is that little thing in th' heater hose? some kinda valve i think its stopped up there . can i take it out?
SOURCE: slightly overheating while at idle and heater on low or off.
The thermostat is starting to stick .
Replace the thermostat.
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: blowing cold air
I had the same problem that I just fix by flushing the heater core out with a hose. take the two hoses off the fire wall and put the water to it and let flush. my heater is putting out 150 dg. F of hot air. I'm so excited! i will stay warm now.
SOURCE: The heater blows cold when
It's possible you have a bad vaccum line to the actuator door in the heater assembly
or possibly a stuck thermostat
SOURCE: Temperature gauge fluctuates and the heater blows cold air
Sounds like the thermostat needs to be replaced. If you do the work yourself be sure the temp threshold is correct and the flow direction is correct when installed. Good luck to you
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