Coolant coming out of coolant reservoir
Thread Starter
Member
Joined: Jul 2016
Posts: 112
Likes: 24
From: Orlando, Florida
2009 E550, 2011 GL550, 2013 GL550
Coolant coming out of coolant reservoir
2013 GL550.
Initial problem was coolant was overflowing out of the designed vent hole in the coolant reservoir (especially during long drives) There is something causing the coolant to come out of the reservoir.
Reservoir has been replaced 3 times, twice with OEM and third time with genuine MB Parts. Radiator, radiator hoses, all 6 turbo coolant lines, coolant reservoir recovery tank hose, water pump, and thermostat was replaced along with all idler pulleys and drive belt.
The car was taken to 3 Mercedes Benz Dealers and they all diagnosed it as either water pump or turbo coolant hoses. They did a block test and it passed.
Does anyone have any insight before I spend anymore...
Thanks
Initial problem was coolant was overflowing out of the designed vent hole in the coolant reservoir (especially during long drives) There is something causing the coolant to come out of the reservoir.
Reservoir has been replaced 3 times, twice with OEM and third time with genuine MB Parts. Radiator, radiator hoses, all 6 turbo coolant lines, coolant reservoir recovery tank hose, water pump, and thermostat was replaced along with all idler pulleys and drive belt.
The car was taken to 3 Mercedes Benz Dealers and they all diagnosed it as either water pump or turbo coolant hoses. They did a block test and it passed.
Does anyone have any insight before I spend anymore...
Thanks
Super Member
Joined: Jul 2019
Posts: 733
Likes: 297
From: New Orleans
2014 GL450, 1992 W140 300SD, 1993 W140 300SE, 1987 E30 Convertible
Before spending any money there is a combustion leak test, basically it test gases coming out of coolant reservoir for blown gasket.
MBWorld Fanatic!
Joined: Jan 2016
Posts: 2,748
Likes: 880
From: In the Shadow of the Tetons
2013 ML350 Bluetec
Does your upper radiator hose still feel pressurized when the engine is overnight cold?
In other words, is there still pressure in the expansion tank when the engine is absolutely cold, like not run for overnight?
I love free tests.
In other words, is there still pressure in the expansion tank when the engine is absolutely cold, like not run for overnight?
I love free tests.
