1999 ford expedition,interior heat not working properly
Heat from front is warm,but not hot, hardly blows at all on defrost mode,seems like it is warmest on the vent mode but not hot. Local ford said it was probably the main atc display module (the one with the disply screen and all the mode location buttons on it) Ichanged this and it is still the same,flushed cooling system,engine temp runs normal.What now?. It was 25 below hear this AM. Help!. Alberta Canada. Regards Jim
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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.
your controls have problems. the heat is there it is just not getting out because your control lines are not setting the vent controls into the proper positions. i had a chev van that lost some of the foam in side there and it blocked the whole front off. i had to rip it all apart to get at it