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#31
08-30-2011, 02:20 PM
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Well, I am not sure what the threshold is for the coolant pressure, but it sounds like we found your problem!
__________________
1987 300TDT - 195,000 (Original #14 head) 1993 190E 2.3 - 105,000 1981 300D - 250,000 
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#32
08-30-2011, 02:30 PM
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Since you're going to change coolant, remove the radiator for better access to cleaning the core and the AC condenser. At least run thumb-over-garden-hose pressure in the reverse direction of airflow.
The reservoir leak is a mixed bag. The system should be tight to ~20 psi which means it's underperforming at 15 psi. On the other hand, it might be masking combustion pressure leaking into the cooling system. Sixto 87 300D
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#33
08-30-2011, 02:32 PM
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Winner. But keep going at it. Your 603 wants to run cool.
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#34
09-07-2011, 05:23 AM
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Well, after a citric acid flush and new expansion tank, I am still getting high temps. The gauge does sit right above 80 C on downhills, where it hasn't before. But the car still cannot maintain it's temp under load.
What's next? New radiator?
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#35
09-07-2011, 08:42 AM
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A new radiator certainly cant hurt. Its a bit pricey however. Stupid question, is your overboost valve bypassed by any chance?
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#37
09-07-2011, 10:43 AM
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Quote:
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#38
09-07-2011, 11:37 AM
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Boost Pressure (low) = Higher Temps Under Load?
Hey Winmut....are you thinking that low boost may actually result in higher temps under load? I've pondered that for a long time...and there are several turbo to "joints seals" where boost could be lost not to mention a crudded up waste gate.
Your thoughts please!!!
__________________
 1986 300SDL 440,xxx
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#39
09-07-2011, 11:51 AM
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No I was thinking overboost. Low boost would only incur high temps if the turbo was not spinning freely.
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#40
09-07-2011, 05:40 PM
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Quote:
You mentioned that at 15psi your expansion tank/coolant reservoir cap is letting coolant out right? You also mentioned you replaced the coolant reservoir but not it's cap. I though the cap was responsible for pressure regulation?!! As a side note, I don't think that's your main problem however. Best of luck on this issue! Josh ..
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#41
09-08-2011, 12:18 AM
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I have a new cap. It really seems like the car cannot maintain temperature or cool itself down when needed. I changed the thermostat and saw no improvement, so I'm ruling that out. Did a flush, and water seemed to flow through the radiator ok. I'm thinking water pump or radiator. Folks have told me the water pump either works or doesn't.
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#42
09-08-2011, 04:17 AM
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Quote:
Does turning on the heat bring the temps down?
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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