Question about 2000 Chevrolet Blazer
Gday mate,geoff here, what i have found in the past is that as most vehcles have the heater on all the time and the temperature from it is controled via a air flap the opens and closes, check list, is there leaves , what-not trapping the flap, vents, are the vacuum hoses contecting the systems under the dash connected and operating, is the A/C actually coming on ? is there an A/C fault under the hood? hope this starts the procss fro you,geoff.
Posted on Feb 11, 2012
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Posted on Jan 02, 2017
SOURCE: s-10 blazer heater
The Idle Air Control valve might be bad and may need to be replaced. It should be located on one of the heater hoses. You can take the cable off and move it one way or another to see if it will get hot. If it doesn't then it should be replaced, or the heater core might be clogged.
Posted on Nov 27, 2008
check under the dash to see if the blend door is operating, this ian internal door between the heater core and the a/c evaporator. also check that the drain hose from the evaporator make sure its clear and water is coming out of it,otherwise the evaporator will freeze solid and therefore no cold air
Posted on Apr 09, 2009
SOURCE: blowing hot air all the time
There is a door that opens to the heater core.When the vacum control in the dash gets old the diaphram gets to flimsy to close one port so it puts vacum to all ports.Therefore there is not enough pull to engage the vacum motor to move the trap door.Change the switch in the dash. Check to make sure that there isn't an obstructing object in front of the door before you buy a new switch
Posted on Jun 02, 2009
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
Posted on Oct 16, 2009
I have the same problem with my 2001 Tahoe. The front blower is working, its blowing strong, but its cold air even with the temp setting as high as it can get. The rear blows hot air. The engine temp guage is at about 210ish which is close to being normal (220). I just replaced the thermostate a few months ago, I don't know if its bad again, or it I deluted the antifreeze too much and it frooze the heater core, or if the heater core just went bad. Any one know what the cause could be?
Posted on Jan 04, 2010
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