1998 Ford Explorer heater

Can you describe what is happening with the heater?

You stated you put some coolant in, where was the coolant low?Are there any leaks that you can see in the radiator, hoses or engine? I cannot remember if your vehicle is a closed system with a pressureized cap on the recovery bottle or not.

When the engine is cold make sure the radiator and the recovery bottle are both full.

I am sure with some more information we can help you figure this out.

Thank you,

Dan

Here is a quick diagnostic on your heater core. Locate the heater hoses that run to the firewall (to the heater core). With the engine warm and running and the temp setting on you heater to full heat. Feel both hoses to the heater core, if they are both warm and feel close to the same temp (one may be slightly cooler) the coolant is flowing though the heater core. If this is the case the temp door in the heater box is not operating and you will have to determine if it is a control issue or or a problem inside the heater case itself. The door may be broken or something fell down through the duct work and is blocking in the cold air position to name a couple of possibilities.

If they are not warm or one in dramatically colder than the other, the coolant is not flowing through the heater core. If this is the case you may be able to flush the heater core out and restore the heat or you may have to replace the heater core.

Just a couple of ideas, let me know what you find and we can go from there.

Thank you,

Dan