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  #1  
Old 08-08-2009, 09:40 PM
arkie's Avatar
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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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Old 08-08-2009, 09:52 PM
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hows the cap?
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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

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  #3  
Old 08-08-2009, 10:00 PM
arkie's Avatar
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Quote:
Originally Posted by 79Mercy View Post
hows the cap?
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  
Old 08-08-2009, 10:59 PM
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do you notice any white smoke out the tail pipe?
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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
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  #5  
Old 08-08-2009, 11:00 PM
arkie's Avatar
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Quote:
Originally Posted by 79Mercy View Post
do you notice any white smoke out the tail pipe?
No white smoke out of the tail pipe.
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  #6  
Old 08-08-2009, 11:56 PM
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replace thermostat?
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  #7  
Old 08-09-2009, 12:41 AM
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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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