1991 E300 coolant leak
Thread Starter
Newbie
Joined: Oct 2009
Posts: 3
Likes: 0
From: Sacramento, CA
1991 300e 4matic
1991 E300 coolant leak
Hello,
First time post and looking for some advice regarding a coolant leak. It is a slow leak that drips from the passenger side of the engine block around the middle of the block. When the engine is running the leak is faster but not too fast. When the engine warms up the leaking coolant sizzles and evaporates. I can see coolant run down to one of the freeze plugs, run down along the edge of the freeze plug, then down to the bottom of the block, and ultimately drip very slowly on to my garage floor. My commute is short, 10 miles round trip, and after few days I check the coolant level and have to refill but not very much. My vehicle has 150K miles and I recently changed the radiator.
Any ideas?
Thanks.
First time post and looking for some advice regarding a coolant leak. It is a slow leak that drips from the passenger side of the engine block around the middle of the block. When the engine is running the leak is faster but not too fast. When the engine warms up the leaking coolant sizzles and evaporates. I can see coolant run down to one of the freeze plugs, run down along the edge of the freeze plug, then down to the bottom of the block, and ultimately drip very slowly on to my garage floor. My commute is short, 10 miles round trip, and after few days I check the coolant level and have to refill but not very much. My vehicle has 150K miles and I recently changed the radiator.
Any ideas?
Thanks.
Newbie
Joined: Aug 2009
Posts: 13
Likes: 0
From: Pacific Northwest
1991, 300te 4matic
Hello,
First time post and looking for some advice regarding a coolant leak. It is a slow leak that drips from the passenger side of the engine block around the middle of the block. When the engine is running the leak is faster but not too fast. When the engine warms up the leaking coolant sizzles and evaporates. I can see coolant run down to one of the freeze plugs, run down along the edge of the freeze plug, then down to the bottom of the block, and ultimately drip very slowly on to my garage floor. My commute is short, 10 miles round trip, and after few days I check the coolant level and have to refill but not very much. My vehicle has 150K miles and I recently changed the radiator.
Any ideas?
Thanks.
First time post and looking for some advice regarding a coolant leak. It is a slow leak that drips from the passenger side of the engine block around the middle of the block. When the engine is running the leak is faster but not too fast. When the engine warms up the leaking coolant sizzles and evaporates. I can see coolant run down to one of the freeze plugs, run down along the edge of the freeze plug, then down to the bottom of the block, and ultimately drip very slowly on to my garage floor. My commute is short, 10 miles round trip, and after few days I check the coolant level and have to refill but not very much. My vehicle has 150K miles and I recently changed the radiator.
Any ideas?
Thanks.
MBWorld Fanatic!
Joined: Apr 2007
Posts: 2,381
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Before concluding its the head gasket, make sure the oil gallery plugs have not corroded as they are located in the middle of the block on the passenger side.
EDIT: Nevermind freeze plugs are same thing. Missed it. So yes probably head gasket especially at 150k miles if it has never had a rebuild.
EDIT: Nevermind freeze plugs are same thing. Missed it. So yes probably head gasket especially at 150k miles if it has never had a rebuild.
Thread Starter
Newbie
Joined: Oct 2009
Posts: 3
Likes: 0
From: Sacramento, CA
1991 300e 4matic
Thanks for the responses. I was wondering about the head gasket vs. water pump but the water pump looks to be more oriented towards the drivers side. This is my first Mercedes so I'm learning.
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MBWorld Fanatic!
Joined: Apr 2007
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If the water pump is leaking, you should see coolant stains on the metal. It should be obvious.
You can also put some UV Dye in the system to 100% find out where its coming from. You can find it at any local auto store.
You can also put some UV Dye in the system to 100% find out where its coming from. You can find it at any local auto store.
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MBWorld Fanatic!
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Just stick with Victor-Reinz. I recommend getting the complete set /w intake + exhaust gaskets. Autohausarizona carrys it for about $60 IIRC.
I'm 10k miles into my new gasket and no problems
Everything fit perfect and I am happy with it.
I'm 10k miles into my new gasket and no problems
Everything fit perfect and I am happy with it.
