Renault Koleos Service Repair Manual: Engine cooling system: Check

Renault Koleos Service Repair Manual / Engine and peripherals / Cooling / Engine cooling system: Check

IMPORTANT To avoid any risk of damaging the systems, follow the instructions regarding safety and cleanliness and operation recommendations before carrying out the repair.

IMPORTANT When working in the engine compartment, take care as the radiator fan(s) may start up unexpectedly (risk of being cut).

To avoid any risk of serious burns when the engine is hot:

do not open the expansion bottle cap,
do not drain the cooling system,
do not open the bleed screw(s).

I - CHECKING THE SEALING OF THE COOLING SYSTEM

Cooling

Pressurise the system using the radiator cap checking device (A) and an adapter (B) .
Test pressure:
- 2TR: 0.88 bar
- M9R: 1.37 bar
Check that there are no leaks.

II - CHECKING THE RADIATOR CAP VALVE SEAT

Cooling

Check:
- that the valve seat (1) is inflated at the point that the edge of the metal tappet (2) is not visible when viewed from above,
- that the valve seat is not dirty or damaged.

III - CHECKING THE VACUUM VALVE

Cooling

Pull on the vacuum valve (3) to open it.
Check:
- that the vacuum valve closes completely when it is released,
- that the vacuum valve is not dirty or damaged,
- that there are no abnormalities in the opened or closed statuses of the vacuum valve.

IV - CHECKING THE DISCHARGE PRESSURE OF THE RADIATOR CAP

Cooling

Apply engine coolant to the surface of the cap seal.
Refit:
- the radiator cap checking device (A) using an adapter (B) ,
- the radiator cap on the adapter.

Note: The pressure should not drop; if it does, look for the leak.

Pump with the radiator cap checking device.
Discharge pressure:
- 2TR: 0.784 - 0.98 bar (limit 0.59 bar)
- M9R: 1.27 - 1.47 bar (limit 1.08 bar)
Replace the radiator cap if there are any irregularities relating to the three components above.

Engine cooling system: Specifications

Engine cooling system: Operating diagram

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