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1983 240d - 1985 300d - 1984 280sel
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393 Posts
Discussion Starter · #1 ·
Hi- I just replaced my old thermostat since it was only allowing my 240d to heat up to about 60 degrees. I replaced it with one rated at 79 point something degrees and took it for an about 7 or 8 mile test drive. It heated up normally, but when it reached 80 degrees, it just kept climbing. I got probably close to 90 degrees before I reached home. Does anyone know what could be causing this?
 

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1983 240d - 1985 300d - 1984 280sel
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393 Posts
Discussion Starter · #2 ·
Some more info- I just let it idle for about 10 minutes and drove it around the neighborhood once. Temp got up to about 85. I opened the hood and squeezed both the coolant hoses, there seemed to be no pressure in either, and yes, I have completely filled the radiator.
 

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1984 300D Turbo
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1,606 Posts
maybe there's an air pocket. drive it around some more with the heater on full blast. it might just need 'burping'.
90 deg is fairly normal in my opinion ie. temp gauge just about horizontal.
 

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Benzless for now...
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1,558 Posts
Not to put you down, I've done this myself once. Is it possible you installed the thermostat backwards?
 
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