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How can I resolve a coolant leak that occurs when I remove the radiator cap?

Tiny
KEN VICKERS
  • MEMBER
  • 1996 MERCEDES BENZ S320
  • 138,000 MILES
I have a 1996 Mercedes S320 with a coolant leak. It leaks when I remove the radiator cap and stops after it's replaced. It appears to be leaking between the block and a unit mounted to the block just below the water pump. Can you tell me what that unit is and how I can resolve the problem?
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Friday, February 3rd, 2012 AT 7:09 AM

3 Replies

Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
The only thing I can think of below the water pump is the oil pan. The water pump has a weep hole on the bottom. This is probably where the leak is coming from. A small amount of seepage is normal, but when the pump begins to fail, it will begin to leak.
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Friday, February 3rd, 2012 AT 7:26 AM
Tiny
RUSS PITTMAN
  • MEMBER
  • 2 POSTS
Like the dingling guy here told me 'your owners manual will tell you'. Sheesh!
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Monday, May 14th, 2012 AT 2:04 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
The owner manual has a huge amount of information in it. Especially about certain systems unique to your vehicle.
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Monday, May 14th, 2012 AT 4:07 AM

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