1. No heat?
2. Hides a problem with other heater component, like maybe a leaking heat exchanger in the dash?
3. Moron fix for the control cable being broken?
Your rear heater might be the only heater that works!
What a cheap **** that would do that?you dont get cooked out of that
Trk?with out heater control valve it should like having heater turned all the way up all the time
no you will get heat and cold air. the control valve is to give you max cold air. when you switch the air to cold on all the settings it closes the valve and prevents hot coolant from flowing inside the hvac unit and contaminating the max cold air its trying to produce.
you fine with that straight pipe. no harm. you can replace the valve or just leave it.