Purpose: To put the engine cooling system under pressure for the leak test. Note: In combination with W963 589 00 21 00 Leak tester. The tester cap contained in test equipment W963 589 01 21 00 is suitable for model 956 and models 963, 964 up to 10/2014. For models 963, 964 as from 11/2014, tester cap W963 589 03 91 00 must be used.
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