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Old 08-19-1999, 03:52 PM
MB STARS MB STARS is offline
Senior Member
Join Date: Apr 1999
Location: Walnut,CA,USA
Posts: 554
That is air trap inside coolant system.......
when heater valve open air flow in heater core with coolant cause gurgling sound. MB has SI for this "gurgle kit" is available order by vin number.

MB STARS Master Guild Technician,12 years MB tech
5 years independent shop owner