After the engine runs and temp gage says temp is normal but there is no heat. I checked the core for blockage and water flows thru the core unrestricted. Therostat appears to work properly. Is there a check valve in this system that could be restricting water flow to heater?
Ensure cooling system is operating properly. Check heater system hoses and core for coolant flow. Check for loose or misaligned cable to temperature blend door. And check blend door is not stuck closed
TEMPERATURE CONTROL LEVER
The temperature lever mechanically operates a cable to adjust the temperature blend door. Temperature blend door is in the plenum assembly. When temperature lever is in COOL position, temperature blend door closes off airflow to heater core. When lever is in the WARM position, air is directed through the heater core. When lever is in intermediate positions, heated air is blended with cooler incoming air to achieve desired temperature.
January, 8, 2012 AT 7:27 PM
Is the blend door on 2000 2.4 controled by vacuum hose, which is normaly open.