F5C Fuel System - High Pressure Pump Is Pumping More Fuel Than Expected. Check Metering Unit Circuit, Low Pressure Fuel Tubes (Return From Pump To Tank Clogged), Fuel Pressure Sensor, Or If Injectors Are Leaking. Red
Fuel Flow Set point Too Low
If Inadequate air flow is problematic, so clogged air filters, evaporator core air flow restricted, faulty blower fan motors, defective blower switch or faulty wiring or loose connections.