coolant leakage through heater holes in the firewall
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Newbie
Joined: May 2010
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2006 Merz. s430 4matic
coolant leakage through heater holes in the firewall
I have a 2000 mercedes benz ML 430. The expansion tank will not retain coolant, instead, as the coolant is poured into the expansion tank it goes into the two heater hoses in the firewall and drains out at the bottom drain hose of the truck in the passenger area immediately. Can someone please help. Thanks. 
Junior Member
Joined: Dec 2010
Posts: 21
Likes: 0
From: Texas
2001 Ml430 | 2003 C32amg
same issue
I have a 2000 mercedes benz ML 430. The expansion tank will not retain coolant, instead, as the coolant is poured into the expansion tank it goes into the two heater hoses in the firewall and drains out at the bottom drain hose of the truck in the passenger area immediately. Can someone please help. Thanks.
- "Did you ever found out what was the problem? and wee you able to fix it? I have a 3 month old baby and I want to makesure the car will be fine when we travel.... Much Thanks in advance!!!
- "Did you ever found out what was the problem? and wee you able to fix it? I have a 3 month old baby and I want to makesure the car will be fine when we travel.... Much Thanks in advance!!!
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
I have a 2000 mercedes benz ML 430. The expansion tank will not retain coolant, instead, as the coolant is poured into the expansion tank it goes into the two heater hoses in the firewall and drains out at the bottom drain hose of the truck in the passenger area immediately. Can someone please help. Thanks.
- "Did you ever found out what was the problem? and wee you able to fix it? I have a 3 month old baby and I want to makesure the car will be fine when we travel.... Much Thanks in advance!!!
- "Did you ever found out what was the problem? and wee you able to fix it? I have a 3 month old baby and I want to makesure the car will be fine when we travel.... Much Thanks in advance!!!
Any coolant that leaks out of the drain tube is excess.
Why are you adding coolant?
If you are filling it above the marked line while the eng. is cold, you are adding too much coolant.
Junior Member
Joined: Dec 2010
Posts: 21
Likes: 0
From: Texas
2001 Ml430 | 2003 C32amg
Figured it out!!
"I had some work done to change an O-ring inside my power steering reservoir but... looks like my "clever" 
mechanic loosen the screw rings to my radiator hose that's why I was getting leaks!! It wouldn't had been so obvious except he had loosen all 3 hoses on my radiator! 
Make the story short it was a simple turn of a screw driver!
"Thanks for your help.
I wasn't aware those were the proper levels for the coolant.. All these time I always put about an inch more to the mid level! 
- Christian
mechanic loosen the screw rings to my radiator hose that's why I was getting leaks!! It wouldn't had been so obvious except he had loosen all 3 hoses on my radiator! Make the story short it was a simple turn of a screw driver! "Thanks for your help.
I wasn't aware those were the proper levels for the coolant.. All these time I always put about an inch more to the mid level! - Christian
