I can not control the air position .it is always at my feet ..and also i just change the thermostat and still some time i have no heat... im thinking its the control unit i have to change .

Mode door actuator . A electric motor that controls a door that directs air flow .

Air Temperature Control Blend Door Failure No Heat or no AC (dependes on where door sticks)

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

the sending unit will not affect heat but if its broken it will effect the fuel control by giving computer false info, i dont think theres a problem with the temp unit, i think the thermostant is bad and is stuck open or you are very low on coolant, if the thermostat was stuck open then you would get some heat not very hot and would take a long time to get heat. i would start by replacing the thermostat, it is very important to bleed air from system after coolant change or thermostat replacing, after filling run engine until fan turns on , let cool some to release preasure then remove cap start engine and top off, drive for 15min then park let cool and recheck coolant, hope this helps,

check fuses and relays. there is an electric motor that opens and closes a "blend air door' that switches from hot to cold. the other lights may or may not be related. Is is very possible that the plug going into the control unit has a bad connection.

sounds like vent flap valve wire has come off (under dash beried in plastic cowling.....

i beleive these are a vacuum system. if air temp is in cold position you will get no heat. listen for hissing noise with motor turned off but key on. if you hear hissing noise you have a hose broken or off. you will have to find it

Having the proper thermostat in fuel injected vehicles is very important.They have a engine coolant sensor to tell the computer the temp of the coolant. If the engine is running too cold,(or cold all the time), the computer is going to tell the idle motor to raise the idle and to give it more fuel, which can damage the cat converter. These vehicles need a 192-195 degree thermostat. Also check the TP sensor (throttle position sensor for proper voltage) the green wire should read .7 to 1.00 volts.

If your guessing the thermostat, I think your guessing right. Easy job to replace it, use a fail safe thermostat next time to avoid this problem in the future. Good luck.

I think u may have an air temperature control blend door problem, the door is moved by a small electric motor, it is stuck in the cold position.

check out selector switch,vacuum hoses ,check transfer door write if did not solve