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#1
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No pressure in coolant reservoir - '83 300D
I have an unusual problem in my '83 300D (W123) - I have no back pressure when I remove the cap to the coolant reservoir and the car runs slightly hot. It has 181K, and has had the reservoir replaced with factory Mercedes in the last 2 years. Running down the highway at 70 the temp runs between 100 and 110 degrees Celsius on the temp gauge, and it runs about the same idling. If I turn the heater on, it drops just a little (right below 100 degrees). I do not trust the temp gauge, it jumps around a little (I cleaned the terminal and sprayed contact OL on it), but I do know there should be pressure on the reservoir. There are no obvious signs of a leak anywhere and I haven't had to add water in the last year of ownership (the temperature gauge has alwayd run between 80 and 100 even in the winter). I also took a hand-pump pressure checker and can't get the system to hold pressure. The whole thing just doesn't add up, especially to the fact that I haven't had to add water yet the system doesn't have pressure. Any ideas guys?
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#2
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hows the cap?
__________________
1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
#3
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Cap was brand new with the reservoir - has the "magic" three pointed star on it so it must be good .
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#4
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do you notice any white smoke out the tail pipe?
__________________
1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
#5
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No white smoke out of the tail pipe.
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#6
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replace thermostat?
__________________
327K on 1986 W201, 602.911, 722.414 2.5 190D ("The Red Baron") 139K on 1993 W124, 104.942, 722.433 2.8 300E ("Queen") http://farm5.static.flickr.com/4081/...0bb92d3c_m.jpg http://i370.photobucket.com/albums/o...g?t=1325284354 Do not worry about your difficulties in Mathematics. I can assure you mine are still greater. - Albert Einstein take a walk down memory lane... |
#7
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Even though the resevoir is pretty new, it might have a crack in it. Have you pressure tested just the tank?
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