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#1
10-02-2007, 11:05 AM
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Intermitent Coolant Leak
Hi Guys,
W124 1995 E320 Sedan. I'm needing your help again. My car has a very strange coolant leak. It happens only about once a week. It leaks when the car is parked. The coolant level reduces about 1/2 inch in the expansion tank and I see coolant under the car, on the garage floor. It is also strange because the leak is not in the engine area. It is in the transmission area. Could it be something related to the heater core? I also checked the overflow tank and it's ok. This is really confussing....
__________________
----------------- Juan 1995 E320 Sedan 2008 Ford Escape RC Helicopter 
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#2
10-02-2007, 11:12 AM
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I would do two things...
1) put some paper towels under the water pump. Even though the coolant is not appearing under the pump, it could be running back and dripping far away from the pump. Intermittent leaks are usually the pump. 2) Get the system pressure tested. If the leak is not at the pump, a pressure test should find it. Do not pour stop leak into the system. This stuff usually does not stop a leak and will only gunk up the water passages in the radiator and engine block. good luck!
__________________
"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy" Current Monika '74 450 SL BrownHilda '79 280SL FoxyCleopatra '99 Chevy Suburban Scarlett 2014 Jeep Cherokee Krystal 2004 Volvo S60 Gone '74 Jeep CJ5 '97 Jeep ZJ Laredo Rudolf ‘86 300SDL Bruno '81 300SD Fritzi '84 BMW '92 Subaru '96 Impala SS '71 Buick GS conv '67 GTO conv '63 Corvair conv '57 Nomad 
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#3
10-02-2007, 08:08 PM
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Yeah check the waterpump, the most logical suspect. it could be some hoses but your gaskets at your waterpump or the waterpump itself could be leaken.
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1986 300SDL, 211K,Dealership serviced its whole life 1991 190E 2.6(120k) 1983 300D(300k) 1977 300D(211k)
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#4
10-02-2007, 08:38 PM
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don't forget the cap.
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Master Computer Engineer, A+, Network+, MCP/MCSA/MCSE 4/2k/2k3 - Messaging, MCTS, MCITP, MCT, Brainbench, ICDL and starting Ph.D 380SE 1984 <------- Totaled by flipping accident 300SE 1988 <------- Sold Volvo S70 2000 <---- 4 family Opel Omega 2002 <-- 4 family 560SEC 1989 <------ Sold 560SEL 1990 <------ Sold 560SEL 1991 <------ 4 my mother 560SEL 1989 <------ Sold 600SEL 1992 <------ Current
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#5
10-03-2007, 11:08 AM
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Water pump seconded (thirded?)
Seal is contracting when it cools, thus leaking. Pressure test may not show it when motor is warm, unless it's a really bad leak. Must test cold........but again, this was the exact symptom of my water pump.
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former: 83 300D, 97 C230, 93 400E current: 08 C300 Luxury , 92 500SL
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#6
10-03-2007, 11:28 AM
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Thank you for your imputs. The water pump is about 1 year old but you theory sounds logical to me so I'll check that.
__________________
----------------- Juan 1995 E320 Sedan 2008 Ford Escape RC Helicopter
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