2000 Ford F-150 XL mileage: 87,000. The heater is not blowing hot air. I have already replaced the heater core, the thermostat, and the anti-freeze. I have even checked the cable that activates the door that is supposed to allow hot air into the ductwork. Am I missing something? Any other possibilities? I don't mind the cold it's just hard to see out the windows when it snows and ice's. The A/C works just fine! Let me know what you think!
The heater control valve may be stuck closed. Also, check vacuum source to valve
February, 17, 2011 AT 9:01 PM
No heat control valve in this one, it's an electrcally operated temperture blend door inside the plenum, scan for codes with a tool that reads "B" codes. If both heater hoses are hot, the blend door is the problem.
February, 18, 2011 AT 4:23 AM
Can't scan the system for codes on vehicles this old, you will need to do what Merlin says but the blend door motor is a known problem. But is not a shade tree job