E8 Coolant control valve mechanically - Blocked closed - P20A1 Vent valve test Plausibility test (start-up)
Coolant control valve mechanically - Blocked closed - P20A1 Vent valve test plausibility test (startup)
Partial frosting and sweating of lines combined with poor cooling, fan belt slipping, loss of refrigerant, restricted or clogged liquid line or expansion valve malfunctioning.