getting hot

[smoke78]

I have a 99 chevy silverado, something is wrong with my heater controls. the everything works ok except the middle knob that controls the temp, it appears to be stuck on hot. I thought it was the swich so I replaced that, but it is still stuck on hot, I cant get the temp to cool down at all.

any ideas as to what is wrong would be greatly appricated.

[jtc001]

Had the same thing happen on my 2001. There is a motor by the floor that controls the cold/hot mixture. This moter was worn and not powerful enough to switch it back to cold and it would stay on hot. Replacement of the moter (about $65) took care of the problem.

[smoke78]

do you know were the motor is located?

[jtc001]

On the passenger side, behind the center console, just above the carpet (i.e. on the bottom of the vent tubing. It is square with two bolts holding it in, about 3 1/2" X 3 1/2", with a 4 or so wire connection to it. My truck has a cover over all the heating ducts and that had to be removed first. If you have a cabin filter, it will be to the left of the filter.

You can tell if you have the right piece - as you move the heat control one way or the other, it will move.

Make sure your vent flap that this controls moves relatively easy (i.e. not jammed).