1988 Ford Exppedition heater in the front will not work

if blend door works blower working check make sure you have enough coolant because suvs holds right much antifreeze.heater not working heater core plugged make sure both heater core hoses hot to touch if so problem could be temperature mode switch.

The blend door actuator is located in the left rear quater panel. It's right there when you remove the trim panel (left side rear) Below is a picture of it when panel is removed along with another picture of the air duct system. I also gave you a picture of the connector at the actuator. Make sure you are geting power and test opening and closing. Worst case you could make the blend door stay to where you are geting heat until you can repair the problem...

you need to have automatic ac and heater control checked out at a garage problem could be in the mode switch or electrical problem causing front blend door actuator not working properly.your vechicle has the EATC SYSTEM which is computer control need diagnostie equipment to fix.

Is the correct type of heater core that use for rear heater?Check fan fix its correct side,or wiring change or return water line is blocked.

have the front blend door and actuator inspected to see if operational.

With your front heat working the most likely cause for the rear heat not to work is that there is an obstruction in the line that is preventing the warm coolant to get to the rear heater core or the rear heater core itself is plugged and not circulating. Another possible cause could be low coolant level where the system has enough coolant to provide the front system with enought warm coolant but not the rear system. Hope this helps

somewhere in the cabin there is a panel, behind it there will be a small vacuum valve that opens duct heat/cool for the back. I had it go bad in a windstar and stuck on heat, too lazy to replace so i'd pull panel and manually move it once or twice a year

Hope I was avle to help, glad you up and going.

Shelly,

Buy used parts at car-part.com. Look on page with * to find the cheapest part. Coud be your temp blend door (#2) may not be moving back and forth. Or, you are not getting hot water to the rear heater core.


You may have to crawl under the truck and feel the heater hoses to see if they are hot. You will find a group of 4 lines, 2 for heater and 2 for a/c. If hot, you know hot water is getting back to the heater core. If not, there may be a hot water vave that's not working. Not sure if EXP. has a water valve for rear.

Let us know what you you find. Good luck.

impeller is made of plastic on teh water pump and its slipping and spinning on the shaft renew before weather warms up as engine will overheat