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  #1  
Old 03-26-2003, 05:52 PM
tvpierce's Avatar
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Join Date: Feb 2002
Location: Portland, ME
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W201 Coolant Leak

My '92 190E (2.3) has developed a significant collant leak. It appears to be coming from rear of the engine, so I immediately thought that it must be a heater hose -- but the heater hoses are fine. In fact, all the hoses seem to be fine.

When I let the car idle in the driveway, it doesn't leak. It also doesn't seem to leak when I drive it. But after I park it (after dirving) and it sits for a minute, then the leak starts.

Where should I be looking??? Any insight is appreciated.

Thanks in advance.

Jeff Pierce
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Current Vehicles:
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  #2  
Old 03-26-2003, 07:46 PM
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Join Date: Mar 2003
Location: Southern California
Posts: 2,037
Did you remove the plastic HVAC plenum screen and check the hose connections and heater control valve? Leaks in this area will usually drip through the plenum drain and land on the transmission.

Carefully check around the auxillary coolant pump. Sooner or later they will begin to seep.

Also, don't overlook the coolant pump and hose connections up front. Small leaks often migrate along the engine and drip at the back even though the source is up front.

Duke
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  #3  
Old 03-26-2003, 10:53 PM
tvpierce's Avatar
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Join Date: Feb 2002
Location: Portland, ME
Posts: 612
Thanks for the suggestions, Duke. I'll check them out.

Jeff Pierce
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Jeff Pierce

Current Vehicles:
'92 Mercedes 190E/2.3 (247K miles/my daily driver)
'93 Volvo 940 Turbo Wagon (263K miles/a family truckster with spunk)
'99 Kawasaki Concours
Gravely 8120
Previous Vehicles:
'85 Jeep CJ-7 w/ Fisher plow (226K miles)'93 Volvo 940 Turbo Wagon
'53 Willys-Overland Pickup
'85 Honda 750F Interceptor
'93 Nissan Quest
'89 Toyota Camry Wagon
'89 Dodge Raider
'81 Honda CB 750F Super Sport
'88 Toyota Celica
'95 Toyota Tacoma
'74 Honda CB 550F
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  #4  
Old 03-27-2003, 01:42 AM
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Join Date: Apr 2000
Location: LEMONT-CHICAGO
Posts: 412
Borrow a pressure testor from one of the stores like AutoZone.
It is a fact that the pressure builds after a hot engine is shut off and will like a few minutes later. It is difficult to look around for leaks on a hot engine. The pressure tester will let you do so repeatedly when the engine is could.
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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T
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