why is my heater blowing air but does not get hot? 1994 toyota camry

Thermostat, Low coolant, Temp door or control cable. Just to answer a few. Have it checked by a service center to make sure.

Check your coolant level first. The heater core is generally at the highest point in the system so if coolant is low, the core could be empty. Be sure to check the level before the first start of the day. This will ensure accuracy and safety.

AGREE WITH #1 AND 2