Question about 1999 Chevrolet Blazer
Why is my heater blowing cold air after installing a new heater core?
You need to verify that warm coolant is getting to the heater core by touching the hoses going into the firewall. If they are both the same temp or close, you might have a blend door actuator broken or sticking that does not direct warm air into cabin area
Posted on Feb 11, 2012
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Posted on Jan 02, 2017
ther are two small tubes that open and close the valve to let in the hot air' one is from right under the carb intake and goes to the right (looking at the engine) right behind the fuse box. if there's o hole in that tube the heat will not work. just change mine becase the tube dry-rotted
Posted on Dec 04, 2011
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.
Posted on Feb 27, 2009
Your heater valve is stuck open, also in a pinch you can crimp off your hose to the heater coil at fire wall. Try to find the heater valve vacumb hose under the hood see if it is bad and fixit. or some models have a cable to the valve could be broken.
Posted on Jul 28, 2009
the idea of the switch is run on vacuum and is not making contact with the switch it self either worn contacts in the switch itself **** as an obstruction as well or the vent door is stuck in just that position either behind the glove box or the ash tray are the vacuum lines one of them may be pinched off or the door needs a bit of help until you can free it up
Posted on Sep 08, 2009
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