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Car engine cooling system Renault Laguna 2

Description of the design of the cooling system
Note (figure 2.1). The opening pressure of the safety valve in the expansion tank cap is 1.2 bar (brown cork). Figure 2 1. Functional diagram of the cooling system (engines K4M, F4R, F4P - cars with MKL): 1 - engine, 2...

General information and precautions when repairing the cooling system
Since cooling systems are designed to operate under pressure, beware of severe burns from escaping fluid. Never remove the expansion tank cap while the engine is hot. When working in the engine compartment, also beware...

Filling the system and removing air
Note: Coolant is constantly circulated through the heater core, which improves engine cooling efficiency. Refueling Be sure to open the air bleed valves. Fill the system with coolant through the expansion tank opening....

Checking the tightness of the system
Replace the expansion tank cap valve with the MS 554-01 adapter. Connect the MS 554-07 device to it. Warm up the engine, then stop it. Build up pressure in the system. Stop pumping when the pressure becomes 0.1 bar...

Checking the valve opening pressure
If fluid leaks through the expansion tank cap valve, it must be replaced. Install the MS 554-06 fixture on the MS 554-07 pump, then install the valve to be tested on the fixture Increase the pressure. It should...

Removal and installation thermostat (L7X)
Removal Place the vehicle on a two-post lift. Disconnect the battery. Remove the engine sump guard. Drain the coolant by disconnecting the drain hose from the radiator. Remove the air filter air intake pipe. Disconnect...

Removal and installation the thermostat housing at the outlet of the cylinder head (F9Q)
Removal Place the vehicle on a two-post lift. Remove: engine Top Covers; protection of the engine oil pan. Remove the battery. Drain the fluid from the engine cooling system. Disconnect: boost Pressure Control Solenoid...

Removal and installation the radiator (all engines)
Place the vehicle on a two-post lift. Disconnect the battery and remove the engine sump guard. Drain the coolant by disconnecting the drain hose from the radiator. Remove: relay box, pressing the spring clamps 1; shelf...

Removal, cleaning and installation of the water pump (engines K4M, F4R, F4P)
Removal Place the vehicle on a two-post lift. Disconnect the battery. Drain the coolant by disconnecting the drain hose from the radiator. Remove: gas distribution mechanism drive belt; timing drive tension roller (k4M...

Removal, cleaning and installing the water pump (F9Q engines)
Removal Place the vehicle on a two-post lift. Disconnect the battery. Remove the engine sump guard. Drain the coolant from the cooling system by disconnecting the drain hose from the radiator. Remove: gas distribution...

Removal, cleaning and installing the water pump (L7X engines)
Removal Place the vehicle on a two-post lift. Disconnect the battery. Drain the coolant. Disconnect the drain hose from the radiator. Remove: timing belt; mot. 1430 clamps from the front cylinder head. Attention! The...

Removal and installation the electric fan of the engine cooling system (F9Q)
Removal Place the vehicle on a two-post lift. Disconnect the battery. Remove: upper engine covers. protection of the engine oil pan. Disconnect: wiring harness from the electric fan of the engine cooling system; the...

Removal and installation the electric fan of the engine cooling system (F9R)
Removal Move aside ECU 1 of the automatic transmission. Remove the battery. Remove: battery shelf mounting bolts. shelf for the battery. Disconnect both engine cooling fan electric connectors. Separate the electric fan...

Removal, cleaning and installation of the water pump (K4M engines)
Removal Remove the battery. Disconnect the protection and switching unit 2 at points 1. Move the protection and switching unit to the side. Remove bolt 3 securing the air intake duct. Drill out three permanent bolts...

Removal, cleaning and installing the water pump (G9T engines)
Removal Place the vehicle on a two-post lift. Disconnect the battery. Remove: engine Top Covers; battery; shelf for the battery. Remove: nuts 1 for fastening the injection system ECU; nut 2 for fastening the ECU wiring...

Removal and installation the water pump supply line (F9Q)
Removal Place the vehicle on a two-post lift. Disconnect the battery. Remove: engine Top Covers; protection of the engine oil pan. Drain the fluid from the engine cooling system. Disconnect the lower hose between the...

Removal and installation the water pump supply line (K4M)
Removal Caution: Since cooling systems are designed to operate under pressure, beware of severe burns from escaping hot fluid. Do not remove the expansion tank cap when the engine is hot. When working in the engine...

Removal and installation the water pump supply line (L7X)
Removal Remove the battery. Remove: Automatic transmission control unit: relay Block 1; bolts for fastening 2 shelves for the battery. Note: To remove the battery shelf mounting bolts, drill out three permanent bolts...

Removal and installation the expansion tank
Caution: Since cooling systems are designed to operate under pressure, beware of severe burns from escaping hot fluid. Caution! Never remove the expansion tank cap when the engine is hot. When working in the engine...

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Other sections on other Renault models

➽ Power unit: Cooling and lubrication system Renault Fluence 1 (2009-2020, petrol)
➽ Power unit: Cooling system Renault Symbol 2 (2008-2013, petrol)
➽ Power unit: Cooling system Renault Duster 1 (2009-2017)
➽ Power unit: Cooling system Renault Logan 1 (2004-2012, petrol)
➽ Power unit: Cooling system Renault Sandero 1 (2007-2012, petrol)
➽ Power unit: Cooling system Renault Megan 2 (2002-2009, petrol)

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