Renault Laguna III Manual page 1403

Engine cooling system: Check
1 - Checking the expansion bottle cap valve
a Fit onto the tester (Ms. 554-07), the adapter (Ms.
554-06).
a Fit the expansion bottle cap to the adapter (Ms. 554-
06).
Note:
The pressure should not drop; if it does, look for
the leak.
a 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
a Replace the expansion bottle cap with the adapter
(Ms. 554-01).
a Connect on the adapter (Ms. 554-01) the tool (Ms.
554-07).
a Pump with the (Ms. 554-07) to put the cooling circuit
under pressure.
a Stop pumping at 0.1 bar below the valve rating for
the expansion bottle cap valve with.
Note:
The pressure should not drop; if it does, look for
the leak.
COOLING
a 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.
97871
19A-15
19A