Re: heat does not come on when truck is not moving 2002...
Hello I was just browsing and saw this problem. It turns out i have had two vehicles with this same problem (both chevy trucks). My solution was to add antifreeze to the radiator. See my understanding is that when your vehicle is at a hault, there isn't enough antifreeze to circulate through the heater core. But when you are driving the motor circulates what is there to all components that require antifreeze. Again this is just my own understanding and it worked on multiple vehicles that i own.
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There is usually a diagram under the hood to show you the routing of the belt or you can get an auto parts to give you a diagram. The drive belt runs on what is called a tensioner and this tensioner has a bolt on front of it that you place a socket or specialized tool on. Pull or push the bolt and the spring in the tensioner will move either up or down allowing you to remove the belt and or replace the belt. Hope this helped
If the air deflector is moving correctly, Make sure your thermostat is not hanging open and that your coolant level is up to standards. While the engine is at running temp. check the two hoses that go through the firewall to the heater core. If they are both hot than one of the servos, vacuum or motorized may not be moving the deflector doors correctly. Try to hear any movement when you switch back and forth between defrost and floor heat.I doubt you need to replace the heater because of the age of your vehicle. Try to watch for any movement under the dash while you move the control. Good luck, Dana
you need to get under the dash board and remove the passenger lower kick panel. ther will be a small motor bolted into the evaporator housing. remove it and manually move the blend door. if the heat gets hot the you need a blend door actuator.
Did you check the blend door motor? they will break and cause the door to not move. the dealer can run it thru a mode/blend door test. They just try to move the door with the obd computer they can calibrate them as well.