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  #1  
Old 06-10-2019, 09:15 PM
tivoliman's Avatar
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Join Date: Dec 2002
Location: New Jersey
Posts: 367
Question R107 coolant mystery leak

Coolant empty, but no known leak spot.

Seems to only leak when the car is resting or cool. Seems to hold the coolant while I'm driving it.

I'm in the process of replacing the hoses, but that choice was made based on the age, I don't see any fluid on the hoses.

Your suggestions are appreciated.

I have not crawled under the car yet. The garage floor is just sopping wet.

Slithering on the floor is in my future, but your guidance on where to look is appreciated.
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Bill Fisher

'86 560SL (186K) - Now a 'classic' : Registered as an Historic Vehicle
'95 E420 (198K)
'99 E320 (80K)
'03 LS430 (Lexus)
- - - - -
'95 E420 (231K) Sold to a happy buyer, new to Mercedes
'90 300E (65K) Sold to an Mercedes Lover
'92 190E (215K) - retired to the salvage yard, sigh
'93 500SEL (214K) - Moved to another family, still runs like a young pup
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  #2  
Old 06-11-2019, 06:51 AM
tivoliman's Avatar
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Location: New Jersey
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Radiator - newer

and there's no coolant under the radiator, which is about 10K miles old
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Thanks for the help
Bill Fisher

'86 560SL (186K) - Now a 'classic' : Registered as an Historic Vehicle
'95 E420 (198K)
'99 E320 (80K)
'03 LS430 (Lexus)
- - - - -
'95 E420 (231K) Sold to a happy buyer, new to Mercedes
'90 300E (65K) Sold to an Mercedes Lover
'92 190E (215K) - retired to the salvage yard, sigh
'93 500SEL (214K) - Moved to another family, still runs like a young pup
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  #3  
Old 06-11-2019, 07:57 AM
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Join Date: Sep 2013
Location: Alhambra California
Posts: 1,921
Possible leaks may be coming from an expansion (freeze) plug or the water pump weep hole at the bottom of the water pump. Try to isolate whether the liquid is coming from the front, middle or rear of the engine. By doing this you may be able to identify closer where the leak is coming from.
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  #4  
Old 06-11-2019, 09:34 AM
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Join Date: Nov 2002
Posts: 713
most likely water pump. had many of them leak during cooldown. i pressurize the system and let it sit overnight. good luck, chuck.
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  #5  
Old 06-11-2019, 09:37 AM
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not a rotten radiator trans line? had that before,pink trans fluid
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  #6  
Old 06-11-2019, 09:00 PM
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Join Date: Jan 2012
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Do a cylinder leak down with the rad cap off and look for coolant to rise / bubbles. If it does, there is a combustion to coolant leak.

Also pressurize the cooling system to 15 PSI and look for leaks.

Have a look at the AC condensate drains, on some cars if the heater core is leaking it will come out of the drains.
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  #7  
Old 06-11-2019, 09:17 PM
tivoliman's Avatar
Happy with Mercedes
 
Join Date: Dec 2002
Location: New Jersey
Posts: 367
Got the parts

Thanks.
I have the water pump and the hoses, hope it fixes all

I will advise my success after I complete - in several weeks
__________________
Thanks for the help
Bill Fisher

'86 560SL (186K) - Now a 'classic' : Registered as an Historic Vehicle
'95 E420 (198K)
'99 E320 (80K)
'03 LS430 (Lexus)
- - - - -
'95 E420 (231K) Sold to a happy buyer, new to Mercedes
'90 300E (65K) Sold to an Mercedes Lover
'92 190E (215K) - retired to the salvage yard, sigh
'93 500SEL (214K) - Moved to another family, still runs like a young pup
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