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If equipped, it will be at the back side of the engine close to the fiewall. The heater hoses will connect to it. It is usually made of plastic and will have a small lever on it and a vacuum hose connected to it
It sounds very much like the heater control door (inside the heater box) is sticking in one position or the other. It's intended to direct air through either the AC's evaporator or the heater core, depending upon whether you want heat or cooling.
Assuming (highly likely) that the control door is vacuum-operated, you may have a vacuum leak anywhere from the engine to the heater box inside the passenger compartment, via the heater control unit.
Everything inside the car for heat and AS is vacuum actuated blend doors. You apparently have lost vacuum to the control levers. Check all vacuum lines in the engine compartment for pulled loose or cracked and broken hoses. Better yet, find the black vacuum canister (it's like a round ball about 4 inches in diameter and with the engine running, pull the hose off of it to see if you have vacuum on that line. Other hose goes in under dash to the gang connection on the back of the controls. If no vacuum on the line to the canister, it's not connected to the engine. Hook it up till you have vacuum to the canister. Should be fine now, unless the line is off under dash. Have faith in yourself friend, you'll find the vacuum leak.
I would make sure all connections on your filter housing is tight..Make sure theres nothing disconnected far as vacuum lines..If you have had your oil changed lately,,check the two lines that hook right where the air filter is..The jiffy lube places,,love to leave them off..If all is good i would suspect the idle air control valve
it sounds like it could be a problem with the vacuum motor it could also be a vacuum line or the switch. I would check the vacuum motor first when you check the vacuum motor you should also be able to see if there is vacuum in the line. if there is no vacuum in the line I would check the switch next.
I have a 2001 mustang gt with ac i dont have air comming out of the front vents so i bought heater controls and no difference then i found a yellow vacume line off but cant find where it goes can any one help me !!!!!! thanks mary
Taurus doesn't have what is called a heater control valve,are you reffering to the remote climate control module,the one that the vacuum lines hook to? If so it is behind the glove box. Just open the glove box and press the 2 clips on the sides so it opens all the way up and it will be located right behind this.