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Showing results for tags 'anti freeze'.
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I have a 1940 Desoto Business coupe. The engine is a 265 industrial Flathead from 1953 or 54. The thing is that all of a sudden this car have started to run really hot.... but only when I use anti-freeze. If i run it with only pure water in the radiator it stays cool, but as soon as I put anti-freeze in it it starts to heat up and lingers right on the edge of overheating. This happens when I cruise down the highway or have the car idling on the driveway. Ive compared the temperature in the radiator when using only water or water/anti-freeze mixture. Theres basicly no difference it runs at about 122 F. So I would say that the radiator does its job and the difference is the temperature of the the engine. Looking at the tempgauge on the dash it runs at about 180 with only water and 212 with anti freeze (basicly it bottoms out the temp gauge). Ive tried to solve it but now Im out of ideas. What Ive done so far is this Flushed the entire cooling system 4-5 times using both of the shelf radiator cleaners and traditional machine wash tablets. The water pump is new as the old on started to leak o few months back. Ive inspected the thermostat and it opens as it should.
