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#1
05-23-2003, 09:11 AM
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300D runs warm
I have a 1985 300D California car that runs warm. Gauge indicated average temp is about 100 C. It climbs when hot outside. We have replaced thermostat, radiator and the water pump. There has been no appreciable change. I know it seems to run warm the hood steams when it rains (more than I have seen before).
Any thoughts? 
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#2
05-23-2003, 09:27 AM
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If you've replaced radiator, water pump, and themostat....and ensured there's no air trapped in the coolant, the next thing I'd do is make sure that the 100C temp you're seeing is accurate.
Whether you replace the temp sending unit or use another device (like an IR temp reader pointing directly at the temp sending unit location) try to verify that the 100C temp is REAL. If it is really running that hot, then you're still ok. 100C is on the high side of *OK* operating temperature.....but not dangerously high by any standard. Sorry I can't point you to the next thing to check after this.
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Chris 1985 300SD - 'Grace' (198K mi.) 2018 Honda Civic Sport 2018 Honda CRV LX 2010 Honda Fit Sport (RIP) 2013 Honda Accord Sport (Sold) 1996 Lexus LS400 (Retired) 1995 Ford Contour SE (Retired) 1976 Porsche 914 (Sold) 1972 Datsun 240Z (RIP)
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#3
05-23-2003, 09:53 AM
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Yes, I understand that this temp is high normal. I am just worried about the creep in the summer. It climbed a lot during the hot days of summer last year and while the pump and radiator have been replaced since, the base has not changed much.
Is it possible that passages are clogged in the block? Is there a flush that could be done? Possible to measure coolant flow?
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#4
05-23-2003, 10:10 AM
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Why don't you use omly 25% coolant and 75% water? Where do you live? Water is a more efficient coolant.
__________________
85 300CD Signal Red/Tan sold 83 300D Manganese Brown 109K 97 E420 Midnight Blue 197K sold 98 BMW 328i Vert White 100K, sold 95 BMW 525i White 125K, sold 93 BMW 525iT Red 193K, sold 95 E320 Green Wagon 125K, sold 94 E320 White 127K, sold 85 300SD 156K Grey (Annie), sold 84 300D Lapis Blue 170K (Judy), sold 99 ML 320 Black (lease), 1998 C230 White (lease) 00 Honda S2000 Red (lease) 86 Mercedes 300E (sold) 84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold)
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#6
05-23-2003, 11:51 AM
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Alan,
Yes, there are coolant flushes. MB even has their own brand of citric cleaner, but I thought that these citric flushes were more for cleaning the radiators but I may be wrong. Edge, ja, the higher ratio of water will help some, but I'd rather see him find the actual cause of the problem. Although, the 75/25 thing isn't a bad idea just for the sake of cooling efficiency. I run my cars at about 70/30 year-round in Atlanta....I also throw in a bottle of Water Wetter for addtional cooling efficiency and corrosion protection.
__________________
Chris 1985 300SD - 'Grace' (198K mi.) 2018 Honda Civic Sport 2018 Honda CRV LX 2010 Honda Fit Sport (RIP) 2013 Honda Accord Sport (Sold) 1996 Lexus LS400 (Retired) 1995 Ford Contour SE (Retired) 1976 Porsche 914 (Sold) 1972 Datsun 240Z (RIP)
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