heater control valve location on 2001 Ford Expedition

i am having problems with my heater front and rear and i changed the thermostat but it did not help. the dealer told me that the blend door motor could be bad but i think that it is a control valve. can you tell me where the front and rear heater control valves are located.

by in Lafitte, LA on January 13, 2010
2 answers
ANSWER by , January 14, 2010
You might find a free repair manual here: http://bit.ly/autozone_repair_info or go to http://bit.ly/alldata_repair_manuals or http://bit.ly/mitchell_repair_manuals_online and get an online repair manual subscription.
ANSWER by , November 26, 2010
any one have picture of location