Removing and installing auxiliary heater Thermo Top V/fleece — VW

🧭 Before you start

Fits: VW Passat CC (357, 2008–2012), VW Passat B6 (3C, 2005–2010), VW CC (358, 2012–2017)

• Opens: fuel

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• Danger of burn injuries.Parts of the exhaust system may be hot.Before removing exhaust system, let it cool off. — Remove exhaust pipe from silencer of auxiliary heater Thermo Top V/fleece .
• Observe safety precautions for working on fuel supply system .
• If the auxiliary heater Thermo Top V/fleece is not to be renewed, connect the vehicle diagnostic tester and select the "“Release heater”" function under 'Guided Functions'.

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.

📋 Procedure

1. On vehicles equipped with auxiliary heater Thermo Top V/fleece, disconnect batteryAElectrical system27Battery; Disconnecting and connecting battery.
2. On vehicles equipped with auxiliary heater Thermo Top V/fleece, disconnect auxiliary battery A1Electrical system27Battery; Disconnecting and connecting battery. [Note: If the auxiliary heater Thermo Top V/fleece is to be renewed, first connect the vehicle diagnostic tester and start the "“Renew heater”" function under 'Guided Functions'.There is an identification plate attached to the auxiliary heater Thermo Top V/fleece. This identification plate indicates which heater version has been installed in the vehicle: Coolant circuit must be bled after it is opened 19Cooling system, coolant; Draining and filling coolant.Cooling system is pressurized when engine is warm. If necessary, release pressure before carrying out repairs.After the auxiliary heater Thermo Top V/fleece has been detached, it must be secured to the vehicle body with welding wire to prevent damage to the coolant hoses.]
3. Loosen washer fluid reservoir on top in order to gain access to securing bolt Electrical system92Windscreen washer system; Removing and installing washer fluid reservoir.
4. Unscrew bolt (arrow) (8 ± 0.8 Nm). — 0.8 Nm (0.6 lb-ft)
5. Remove front right wheel housing liner General body repairs, exterior66Wheel housing liner; Removing and installing wheel housing liner.

6. Remove front nose insulation General body repairs, exterior66Noise insulation; Assembly overview - noise insulation.
7. Remove front bumper General body repairs, exterior63Front bumper; Removing and installing front bumper.
8. ⚠ Danger of burn injuries.Parts of the exhaust system may be hot.Before removing exhaust system, let it cool off. — Remove exhaust pipe from silencer of auxiliary heater Thermo Top V/fleece .
9. ⚠ Danger of scalding injuries.When the engine is warm, the coolant temperature may be above 100° C. The cooling system is pressurised.If necessary, release pressure and reduce temperature before carrying out repairs. — Clamp off coolant hoses (1) and (2) using hose clamps, up to Ø 25 mm3094(3), and pull coolant hoses off auxiliary heater Thermo Top V/fleece.
10. Unscrew circulation pump V55 from heater unit.
11. Unscrew securing bolts (arrow) (8 ± 0.8 Nm) from washer fluid reservoir. — 0.8 Nm (0.6 lb-ft)
12. Pull windscreen washer reservoir in direction of travel out of guides (1) and set it aside. [Note: Observe safety precautions for working on fuel supply system .]
13. ⚠ Danger of fuel escaping.Fuel system is under pressure.Before opening system, wrap a cloth around the connection. Then release pressure by carefully loosening the connection. — Disconnect fuel line at quick-release coupling and seal fuel lines with appropriate plugs.
14. ⚠ Auxiliary heater control unit J364 could be damaged.Overvoltages can occur at the connectors.First disconnect 8-pin connector. — Now, disconnect all remaining connectors from auxiliary heater Thermo Top V/fleece.
15. Loosen securing nut (1) for auxiliary heater Thermo Top V/fleece (2) on right longitudinal member (3).
16. Loosen securing nut (1) and bolt for auxiliary heater Thermo Top V/fleece (2) on right longitudinal member (3).
17. Remove auxiliary heater Thermo Top V/fleece from longitudinal member. [Note: If the auxiliary heater Thermo Top V/fleece is not to be renewed, connect the vehicle diagnostic tester and select the "“Release heater”" function under 'Guided Functions'.]
18. ⚠ When carrying out assembly work, particularly in the engine compartment due to the restricted space, observe the following points:Install all sorts of lines (e.g. for fuel, coolant and refrigerant) as well as electric wiring so that the original routing is restored.Make sure there is sufficient clearance between the lines and all moveable and hot components. — Coolant circuit must be bled after auxiliary heater Thermo Top V/fleece has been installed 19Cooling system, coolant; Draining and filling coolant.
19. Start auxiliary heater Thermo Top V/fleece.

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