Renault Clio: Engine cooling system: Check

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).

Note:

There are two procedures for checking the cooling system:

• the procedure using the (Mot. 1700)
• the procedure using the (Ms. 554-07)

Expansion bottle cap valve rating:

I - CHECKING THE COOLING SYSTEM USING THE TOOL (MOT. 1700)

WARNING

If the coolant is leaking from the expansion bottle cap, replace the valve.

1 - Checking the expansion bottle cap valve

• Use the cooling system filling and diagnostic tool (Mot. 1700). Consult the user's manual for this tool (see Cooling system filling and diagnostic tool: Use) (Technical Note 3857A, 19A, Cooling).

2 - Checking the sealing of the cooling circuit

• Use the cooling system filling and diagnostic tool (Mot. 1700). Consult the user's manual for this tool (see Cooling system filling and diagnostic tool: Use) (Technical Note 3857A, 19A, Cooling).

II - CHECKING THE COOLING SYSTEM USING THE TOOL (MS. 554-07)

WARNING

If the coolant is leaking from the expansion bottle cap, replace the valve.

1 - Checking the expansion bottle cap valve

• Fit onto the tester (Ms. 554-07), the adapter (Ms.554-06).
• Fit the expansion bottle cap to the adapter (Ms. 554- 06).

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

• Pump with the (Ms. 554-07), the pressure should stabilise at the expansion bottle cap valve rating with a test tolerance of +- 0.1 bar.

2 - Checking the sealing of the cooling circuit

• Replace the expansion bottle cap with the adapter (Ms. 554-01).
• Connect on the adapter (Ms. 554-01) the tool (Ms.554-07).
• Pump with the (Ms. 554-07) to put the cooling circuit under pressure.
• Stop pumping at 0.1 bar below the valve rating for the expansion bottle cap valve.

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

• Gradually unscrew the union of the (Ms. 554-07) to decompress the cooling system then remove the adapter (Ms. 554-01) and refit the expansion bottle cap.

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