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E300D slow coolant loss
I'm experiencing slow coolant loss with my '94 E300D wagon. It seems to go oddly though- I recently did a 600 mile trip with no loss, then on a 100 mile trip the level in the expansion tank went down around 3/4 of an inch. I can't see any obvious leaks, all hoses are in good condition, temp stays around 80-82 up to around 85-90 when working hard. No signs of head gasket trouble. With the history of the car I have I know the water pump/thermostat/radiator haven't been replaced in the last 4 years.
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1993 320TE M104 --------------------------------------------------- past: 1983 230E W123 M102 1994 E300D S124 OM606 (x2) 1967 250SE W108 M129 1972 280se 3.5 W108 M116 1980 280SE W116 M110 1980 350SE W116 M116 1992 300E W124 M103 1994 E280 W124 M104 ---------------------------------------------- "music and women I cannot but give way to, whatever my business" -Pepys |
#2
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Have the cooling system pressure-tested for leaks.. the cooling system as many components that could leak, so the only reliable way to test ALL components is to pressure-test. You could have a leaking expansion tank.. they tend to grow hairline cracks over age, but with the symptoms you describe it doesnt sound like that could be the problem.
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Nate 1995 E420 1992 BMW 525i 1984 300D Turbo sold 1993 Volvo 244 sold 1995 Volvo 944T R.I.P! "The details are not details. They make the product." -Charles Eames www.cbs.nu |
#3
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Replace the pressure cap, too -- they go bad and allow the coolant to boil in heavy traffic or after high speed runs, causing occasional coolant loss.
Pressure test is the only real diagnostic, but the caps are cheap. Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs! |
#4
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Thanks for the replies. I saw another 'couple of posts about experiencing the same thing and one turned out to be the thermostat gasket and other was the plastic fitting on top of the radiator for the hose to the expansion tank. I'll have to check after a long run.
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1993 320TE M104 --------------------------------------------------- past: 1983 230E W123 M102 1994 E300D S124 OM606 (x2) 1967 250SE W108 M129 1972 280se 3.5 W108 M116 1980 280SE W116 M110 1980 350SE W116 M116 1992 300E W124 M103 1994 E280 W124 M104 ---------------------------------------------- "music and women I cannot but give way to, whatever my business" -Pepys |
#5
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Quote:
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01 Ford Excursion Powerstroke 99 E300 Turbodiesel 91 Vette with 383 motor 05 Polaris Sportsman 800 EFI 06 Polaris Sportsman 500 EFI 03 SeaDoo GTX SC Red 03 SeaDoo GTX SC Yellow 04 Tailgator 21 ft Toy Hauler 11 Harley Davidson 883 SuperLow |
#6
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I think that antifreeze is an alcohol based brew and is hydrophilic. It makes a pretty tight mix with water and I am guessing that they only separate under controlled conditions. I am not sure what it would take. I have seen antifreeze recycling machines but I don't know if they separate the water from the antifreeze. |
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