98 ford windstar

I have a98 ford windstar the power windows and front and rear heaters dont work .I checked all fusses and replaced the computer under the dash by the brack pedal. the a/c works but when you turn to heat the fan quits

Even the fuses under the hood?

yes and the switch I am about to pull the dash apart again to see If I missed somthing.I tryed the A/C and it is working when it wants.And I still havent found out why the back dont work.

So, what was the problem? Was it a bad ground? We haven't heard why you had heater etc problems