heater won't blow warm air.

It's a bad discharge temp sensor, so the computer doesn't know what the heater is putting out. Sensor has failed reading a high discharge temp so it won't open the heating valve. So my cheap fix was to diconnect the heating valve linkage and control it by hand, I have it set about mid-way and it's about right, If I get warm I roll down the window a little. I live in Ak. so I need heat most of the winter. It works for me up here. Poor people have there poor ways of repairing things.

where is the heating valve linkage at in the car