You need to bleed the cooling system from air,and if you do not have air bubble cheek the heater valve if is open and clues ,,all the best .
SOURCE: 98 Blazer...constant heat from heater, both dash
this problem is caused by a failed HVAC temperature control blend door electric actuator, to replace this part you must remove the entire dash assmbly
SOURCE: no heat changed thermostat
Are you saying the engine does not get hot or that your heaters are not working..?
If it's the heaters, change the temp control on the dash to full heat, then trace the heater hoses under the hood from the firewall back to the motor. Hopefully this will locate the heater tap. Now if the tap is vacuum operated, start the motor and check if there is vacuum at the small hose connected to the tap. No vacuum is correct. Now change the heater control to cold and there should now be vacuum at that small hose.
if vacuum is still not present, or if you have vacuum but it does not go away no matter where the heater control is placed, suspect the control in the dash..
If the vacuum operation is correct, suspect a blocked or damaged heater valve and replace it..
SOURCE: no heat blowing from vents already replaced
I had a problem with that in January 2008, my thermostat was fine. I took my car in to the dealer and they said the hinge that opens and closes the hot/cold air inside the dash broke. They had to remove my entire dash and replace the part. Luckily I was under warranty and didn't have to pay but the repair would have cost $3000.
SOURCE: 1998 Tercel Cold heat to the windshield. Lukewarm out front vent.
Hey,
I just replaced my thermostat in my car due to the same problem. Except mine was a 92. I figured I'd start with the thermostat and antifreeze. Then the heating core. Now I have heat.
But yet I still have no heat on the windshield.
SOURCE: no heat coming from heat vents, blower works. i
Make sure the cooling system is full ... they can run with low coolant and not have it show on the temp gauge. Make sure the heater temp control actual opens the valve the controls the flow of coolant to the heater.
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