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)
If Steering Not Working,Hydraulic suction filter plugged.Improper tire inflation.Steering linkage needs lubrication.Excessive play in steering. See your John Deere Dealer.