Powertrain
generic / SAE
P26AB
Engine Coolant Bypass Valve A Stuck/Open
The coolant bypass valve A is stuck in the open position. Coolant always bypasses the radiator, leading to overheating under load.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number6 / AB
Possible causes
- Valve seized open by sediment or wax high
- Broken return spring medium
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–600 €
- Estimated time: 0.5–2.5 h
- Component: coolant bypass valve a
- Component: thermostat housing
- MIL / check engine light
Sources
References
sae:J2012