Question about 2003 Ford Expedition
The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.
if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.
Posted on Jan 13, 2009
I would like to know if the heater valve fixed this problem?
Posted on Jan 12, 2010
The heater in your car depends upon a flow of hot water not just coolant going through the heater core in order to get hot air into the car. The issue could be but is not limited to the heater core being partially plugged. Your problem is most likely to be the heater control valve. There is a flap (vacuumed controlled) which closes off the heater core until you turn on the heat. Once the heat is turned on the heater control valve will open and allow the hot water from the engine to circulate into the heater core, the flap will also open and allow the air from the fan motor to blow across the heater core given you hot air but only if you have proper circulation to the heater core. If the HCV or the flap doesn't operate properly there will be no heat just cold air.
Posted on Jan 15, 2009
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Feb 15, 2015 | 1992 Cadillac DeVille
Oct 01, 2013 | 2000 Kia Sportage
Nov 04, 2011 | 1998 Ford Escort
Jan 10, 2011 | 1988 Toyota Pickup
Jan 10, 2011 | 2000 Buick LeSabre
Jan 11, 2010 | 2000 Buick LeSabre
Jan 06, 2010 | 2001 Honda Civic
Nov 24, 2009 | 1999 Pontiac Grand Am GT
Jan 26, 2009 | 2001 Chevrolet Lumina
Oct 17, 2008 | 1998 GMC Envoy
852 people viewed this question
Usually answered in minutes!