23 Voltage supply 3 - Coolant control valve and reverting valve (UB3) electrical - Open circuit to UB3 - P20A0 Vent valve (Reductant Purge Control Valve) - Open circuit
Voltage supply 3 -Coolant control valve and reverting valve (UB3) electrical - Short circuit to Ground UB3 - P20A2 Vent valve (Reductant Purge Control Valve) -short circuit 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.