climate control part
 

hello
I brought my lexus ls 400 1991 MY to Spain from the USAand I need to get a part in the states. The mechanics sayit is a valve or faucetlinked to
the climate control function that switches the air fromhot to cold air or in other words from the heater to the air conditioning. Anyone know what part this is in english and how I can purchase it. The name they give me in Spanish does me little good.
thanks
alf