Help! The front heat does not work, but the back does. The front will only blow cold air. The rear has it own control and still blows hot. Also, the engine temperature reading on the dashboard is reading low.

I have plenty of coolant, and all fuses are good. I have changed out the engine temp sensor. The interior fan blower is blowing and the engine fans turn on.

 

There is a manual valve on the heater core input hose on the firewall. Make sure it is all the way down. Up shuts off flow to the heater core,

 

Tyl3rb Welcome to the forum