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No, the inside temp is controlled by a temp door inside the heater box.
behind you glove box
It is at the rear of the intake manifold, follow the heater hose. there is a flow door under the dashboard with a cable connected is that the control or does the valve body at end of intake still control it?
I just changed my heater control valve today. I was able to get the part from Amazon for $98. If you get it from Autozone or O'Reilly's you can expect to pay around $130. The part Motorcraft # YG-378
In my 98 E350 6.8 it is under the dash. you have to pull the dash off to change it
Thermostat is missing or stuck open, coolant level is low, heater core is plugged or heater control valve is stuck closed.
cable
Have you used any stop leak in rad.? If you have pull off heater hoses and back flush heater core. Also check hot water control valve for heater.
98 chevy lddle control valve
no.fully unajusteble
Check coolant level Check to make sure heater core is not air bound Replace thermostat Check the operation of the heater control valve/cable
Could be the Climate Control Unit or Clogged heater core.