Have a 2000 ford expedition and the ac in the front blows hot but the rear ac works fine. what could it be

I have a 2000 GMC Savana Van SLT with front and rear AC/Heat. My front would blow hot while the rear blew cold with AC on. It turned out to be low on Freon. It's hard to know if you have the right amount of freon installed because pressures vary depending on the ambient temperatures. So the best way is to remove all the freon then reinstall the recommended amount as listed on the evaporator housing near the firewall. This worked fine for me... works like new after installing the correct amount of freon.

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.

Expansion valve or orfice tube clog.to front unit.

if it keeps blowin the fuse then the blower motor is bad and replacing it will cause the problem to stop.

thank you
jm

possible blend door actuator faulty, or a faulty blend door. This door switches from hot to cold vents. On expeditions equipped with rear AC front and rear AC have seperate actuators. Hopefully this helps!!

TRY JUMPING THE BLOWER MOTOR APPLY 12 VOLTS TO THE MOTOR IF IT STARTS THEN THE PROBLEM WOULD BE THE SWITCH IF IT DOES NOT START THEN THE MOTOR IS THE PROBLEM GOOD LUCK HOPE THIS HELPS

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

I had the same problem. Found out the the temperature control knob was on wrong, had to rotate it and put it back on. now it works fine.

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.

You either have a bad control, or motor running the air direction door in the front HVAC unit, or a door that is stuck.

The front and rear units are totally separate.

The door directs where the air, cold or hot, should come out, whether it is panel vents, floor, defrost, or any combination of those.

This door and motor are located inside the heater box which usually requires a lot of the vehicle dash assembly to be taken apart to get to these parts.