If the control head is not showing the correct information it will need to be replaced. It controls the HVAC programmer and is how you run HVAC diagnostics. Replace it, then you can test the rest of the system.
Disconnect battery ground cable.
Remove instrument panel trim plates.
Remove control head retaining screws, then draw unit out of instrument panel.
Disconnect electrical connectors at rear of control head.
Reverse procedure to install.
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Tuesday, August 29th, 2017 AT 11:56 PM