103 engine manual shows an aux pump next to coolant expansion tank. The expansion tank shown in the manual is for a 124 car, so it appears that M103 equipped 124 cars have this aux pump.

My W126 has a 103 motor, but does not have the aux pump next to the coolant expansion tank as the 124 cars appear to.

Do the 88-91 300SELs(103 motor) have an aux pump and if so, where is it?

Thanks.

Its buried in the cavity between the two firewalls. Its below and to the side of the monovalve.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician