| Cause | Method of elimination |
| The coolant temperature is very high. The control lamp on the instrument cluster is on | |
| Not enough coolant in the cooling system | Check and, if necessary, top up the coolant level. If there is constant loss of coolant, determine and eliminate the cause of the coolant leak. |
| The thermostat does not open | Check if the cooling system hoses connected to the radiator are getting hot. If the hoses are cold, remove them, check for proper operation and replace the thermostat if necessary. Alternatively, remove the thermostat. This will allow the engine to warm up to normal operating temperature |
| The outer surface of the radiator is dirty | Blow out the radiator with compressed air from the engine compartment. |
| Reduced radiator flow due to limescale or rust deposits on the inner surface of the radiator | Replace the radiator. |
| The radiator fan is not working | Replace the radiator fan viscous coupling drive belt.
On the additional electric fan, check the reliability of the electrical connectors to the temperature sensor and the fan motor. Check the serviceability of the radiator fan motor by disconnecting the electrical connector from the temperature sensor and short-circuiting the connector contacts. When the ignition is on, the radiator fan should work. Otherwise, replace the radiator fan motor. |
| The valve in the expansion tank cap is faulty | Test the valve under pressure. |
| Coolant temperature gauge is faulty | Check the condition of the coolant temperature gauge and sensor. |
| The water pump is not working | Replace the water pump drive belt. |
Cooling system malfunctions (VW Passat B5)
This article is available at russian, bulgarian, belarusian, ukrainian, serbian, croatian, romanian, polish, slovak, hungarian
The text has been checked: Tarasov Ivan
Previous articles
Cooling system hoses
Water pump (1.8-I and 1.6-I ADP engines)
Removal and installation the radiator
Removal and installation the thermostat
Replacing the coolant
Coolant mixture composition
Cooling system hoses
Water pump (1.8-I and 1.6-I ADP engines)
Removal and installation the radiator
Removal and installation the thermostat
Replacing the coolant
Coolant mixture composition
Next articles
Similar articles from other manuals for VW cars:
Possible malfunctions of the cooling system Golf 1 (1974-1984, petrol)
Cooling system Polo 3 (1995-2003)
Pressure testing of the cooling system (petrol engine) Touareg 1 (2002-2006)
Removal and installation the cooling system pump Tiguan 1 (2007-2015)
Engine cooling system — design description Sharan 1 (1995-2000)
Checking the tightness of the cooling system by external… Transporter T4 (1990-2003)
Cooling system connection diagram Caddy 3 (2003-2010)
Possible malfunctions of the cooling system Golf 1 (1974-1984, petrol)
Cooling system Polo 3 (1995-2003)
Pressure testing of the cooling system (petrol engine) Touareg 1 (2002-2006)
Removal and installation the cooling system pump Tiguan 1 (2007-2015)
Engine cooling system — design description Sharan 1 (1995-2000)
Checking the tightness of the cooling system by external… Transporter T4 (1990-2003)
Cooling system connection diagram Caddy 3 (2003-2010)
Link to this page in different formats
No comments yet
Passat B6
Passat B5
Passat B4
Passat B3
Passat B2
- General information
- User manual
- Maintenance
- Petrol engine 1.6L
- Engine repair
- Cooling and lubrication system
- Fuel injection system
- Petrol engine 2.0L
- Engine repair
- Lubrication system
- Cooling system
- Fuel and exhaust systems
- Diesel engine 2.0L
- Engine repair
- Cooling and lubrication system
- Fuel and exhaust systems
- Transmission
- Clutch
- Mechanical gearbox
- Automatic gearbox
- Drive shafts
- Chassis
- Wheels and tires
- Car suspension
- Steering
- Brake system
- Body
- Exterior (external elements)
- Electrical equipment
- Power devices
- Lighting and appliances
- Electrical circuits
- General information
- User manual
- Weekly checks
- Maintenance
- Power unit
- Engine repair
- Cooling system
- Fuel system (petrol)
- Fuel system (diesel)
- Engine management
- Exhaust system
- Transmission
- Clutch
- Car gearbox
- Drive shafts
- Chassis
- Car suspension
- Wheels and tires
- Steering
- Brake system
- Body
- Exterior (external elements)
- Interior (internal elements)
- Doors and covers
- Ventilation and heating
- Electrical equipment
- Power devices
- Lighting and appliances
- Electrical circuits
- General information
- User manual
- Maintenance
- Technical data
- 8-valve engine
- Engine repair
- Cooling and lubrication system
- Supply system
- Ignition system
- Fuel injection «Mono-Jetronic»
- Control system «Mono-Motronic»
- Control system «Digifant»
- Control system «Simos»
- 16-valve engine
- Engine repair
- Cooling and lubrication system
- Fuel injection «K-Jetronic»
- Control system «KE-Motronic»
- Control system «Digifant»
- Diesel engine
- Engine repair
- Cooling and lubrication system
- Power and control system
- Turbocharging system
- Digital control system
- Transmission
- Clutch
- Manual gearbox
- Hydromechanical gearbox
- Front wheel drive
- Chassis
- Car suspension
- Steering
- Brake system
- Body
- Body elements
- Electrical equipment
- Power devices
- Lighting and appliances
- Electrical circuits
- General information
- User manual
- Driving Tips
- Maintenance instructions
- Technical data
- Power unit
- Engine repair
- Ignition system
- Lubrication system
- Cooling system
- Supply system
- Petrol injection system
- Diesel engine
- Exhaust system
- Transmission
- Clutch
- Car gearbox
- Chassis
- Suspension
- Steering
- Brake system
- Wheels and tires
- Body
- Exterior
- Interior
- Heating system
- Electrical equipment
- Power devices
- Lighting system
- Equipment and devices
- Wiper system
- Electrical circuits
- General information
- Introduction to instructions
- User manual
- Power unit
- Engines 4-cylinder FZ
- Engines 4-cylinder
- Engines 5-cylinder
- Transmission
- Clutch
- Four-speed gearbox
- Five-speed gearbox
- Hydromechanical gearbox
- Front wheel drive
- Chassis
- Front suspension
- Rear suspension
- Steering
- Brake system
- Body
- Body elements
- Electrical equipment
- Equipment and devices
- Electrical circuits
Visitor comments