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Old 11-18-2003, 04:36 PM
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Join Date: Dec 2002
Posts: 31
1991 300E Coolant Leak

I have a 1991 300E that just started to leak antifreeze. The location is on the passenger's side toward the back of the engine. It appears to be directly above the block drain. My question is this, Is there somethere (freeze out plug, etc) or am I looking at a possible head gasket leak. I can't seem to see exactly where it originates because the exhaust manifold is in the way. Any help would be greatly appreciated. Thanks Chris
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Old 11-18-2003, 10:37 PM
Mike Murrell's Avatar
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Join Date: Feb 2000
Posts: 2,141
The best way to find a leak like that's not glaringly obvious is to connect a cooling system pressure tester.

With the car level and engine cool, remove expansion tank cap and connect adapter that comes with the tester. Auto Zone and other mass-marketers rent these gadgets.

Pump up to about 15-17 lbs. - wait a bit, then look underneath for where the coolant is landing on the ground, then trace back upwards. The possibilities on 103/104 motors are many. This device will tell you very quickly where it's coming from. Your leak could be coming from the vicinity of the heater control valve - in between the 2 firewalls - passenger side.

If your car has the large encapsulation panel underneath, you'll want to remove this first so the coolant falls down to the ground. If you leave the panel on, the coolant will land on it vs. the ground. Seeing where it lands makes tracing back much easier.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC

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