Coolant Expansion Tank - Cap Modification

REF.NO. 20/38

TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS

DATE: June 1988

SUBJECT:
MODIFIED COOLANT EXPANSION TANK CAP





As of November 1987 production, a modified cap is installed on the coolant expansion tank. Its opening pressure is 1.4 bar (previously 1.2 bar). As a result the maximum coolant temperature increases to approximately 130°C (265°F) with an anti-freeze protection to -30°C (-22°F). This modified cap has the stamped identification number 140 and a blue dot in its center.





Effective Serial Number

The modified pressure cap can also be installed in earlier production vehicles equipped with a coolant expansion tank.





Pressure caps without guide ring (item B, Figure 2) are installed at the time of production.

For Subsequent installation only the cap with guide ring is available.





Parts Information