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1999 E300 Coolant loss question
My friend has a 1999 E300 that seems to be loosing coolant. He had the system checked for leaks, and the rad cap was suspect. A new $35 cap from Pelican, and it still has coolant loss. I suspect a bad head gasket. Anyone know how to make sure of a bad head gasket? I have heard of a test for combustion gasses in the cooling system, but would that be a definitive test? The engine is not overheating at all, nor is there any external evidence of a coolant leak. Also, he says the engine "shudders" when it is turned off. I think he means that the engine shakes a little upon shutdown. I don't know if this is a related problem, but they both started at the same time. Thanks in advance, Rich
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All Diesel Fleet 1985 R107 300SLD TURBODIESEL 2005 E320 CDI (daily) LOTS of parts for sale! EGR block kit http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html 1985 CA emissions 617 owners- You Need This! Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst. Sanden Instalation Guide (post 11): http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html |
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Two areas to check that are not obvious.
1. Leaks into the windshield washer fluid from the windshield washer heater. Anti-freeze will streak the windshield. 2. Slow leak from the auxiliary pump.
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1999 Mercedes E300TD daily driver sold at 238K miles 106K miles were mine, rust worm got it :-( 2006 Mercedes CDI new daily driver! 56,000 miles May 2016 now 85,625 Apr 2018 and Apr 2019 101,000 miles Apr 2020 109,875. March 2024 135,250 |
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Roll guy
I have a 95 e300 with essentially the same engine, om606. Mine has just shy of 300k miles and exhibits the same symptoms, and I found the issue. Mine leaks from a o ring imbedded in the head gasket at the rear passenger side. If you look at a new head gasket you will see it. So mine leaks until it is fully hot, which I suspect the head expands just enough to seal, then as it cools in the garage I will get a couple of drips.
No oil in coolant or vice versa. I am making plans on pulling head and sending it to Metric motors for overhaul. I think I can get another 300k out of bottom end it runs so dang good. Not sure if it's the same on yours but check that rear passenger side closely, mine drips on bell housing.
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1995 E300 (W124) 1999 ML430 (w163) 2011 GL350 (x164) 2016 Sprinter 144" 4X4 lowtop (906) 2004 E500 (W211) 4matic Wagon (Gold) 2004 E500 (W211) 4matic Wagon Avantgarde (silver) |
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Thanks for the replies! I will be sure to check closely at the washer heater and aux pump. The radiator shop that tested it said there were no visible leaks, so I only assumed it has to be a head gasket. The washer bottle might have been overlooked, so that is the first place I will look once pressure is applied to the system.... Rich
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All Diesel Fleet 1985 R107 300SLD TURBODIESEL 2005 E320 CDI (daily) LOTS of parts for sale! EGR block kit http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html 1985 CA emissions 617 owners- You Need This! Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst. Sanden Instalation Guide (post 11): http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html |
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my w210 had a ghost leak too, 8 oz over a period of 6 months. My washer nozzles were dead too (broken elbow connector) - so no streaking to look at.
I did notice that the tank internals looked like an old hard water coffee pot, filled with whitish blue crusty salty deposits. I removed the tank along with the heater and found that little thermostat O rings were flattened and useless. After that repair I have not lost coolant. I suspect those mineral type deposits were from the silicated G-05 coolant.
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2012 BMW X5 (Beef + Granite suspension model) 1995 E300D - The original humming machine (consumed by Flood 2017) 2000 E320 - The evolution (consumed by flood 2017) |
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Quote:
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All Diesel Fleet 1985 R107 300SLD TURBODIESEL 2005 E320 CDI (daily) LOTS of parts for sale! EGR block kit http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html 1985 CA emissions 617 owners- You Need This! Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst. Sanden Instalation Guide (post 11): http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html |
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Quote:
The thermostat itself usually doesnt go bad.
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2012 BMW X5 (Beef + Granite suspension model) 1995 E300D - The original humming machine (consumed by Flood 2017) 2000 E320 - The evolution (consumed by flood 2017) |
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