Taurus wagon 1994. When I turn on the heater, no hot air, I can adjust the speed of the blowing air. but even I turn the thermostat to the extreme right(hot), the temperature is still as same as the normal air. I went to a garage, the technician showed me that the both hoses for inlet and outlet are hot. Is that a problem of the thermostat, How can I fix it. Thanks in advance.