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Old 08-09-2004, 08:47 PM   #1
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Default Engine running hotter

Ever since I changed the water pump and antifreeze, my engine seems to be running about 5 degrees hotter. I used 70% Antifreeze and 30 % water as the maxlife container said to. Any ideas what would cause this?
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Old 08-09-2004, 09:54 PM   #2
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did you check the thermostat?

what condition is it in?
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Old 08-09-2004, 10:25 PM   #3
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replaced my 195 t-stat with a 180 t-stat last August, 2003
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Old 08-09-2004, 10:28 PM   #4
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I'm surprised the antifreeze container said 70/30 because antifreeze(ethylene glycol) has its lowest freezing point at about 50%. Also, antifreeze isn't a particularly good heat conductor and isn't as good as water so this may be why it is running hotter.
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Old 08-09-2004, 10:53 PM   #5
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did you read the mix right? the ZEREX Red that i use has 33% Antifreeze and 67% H2O for the optimum mixture.

As Mark said antifreeze is not the best heat transfer liquid it only gives the water better heat and cold levels. Atleast that is how i understand it - in a non-scientific sense.
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Old 08-09-2004, 11:45 PM   #6
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Yeah the max life said for maximum performance to use 70 % anti and 30% water.
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Old 08-09-2004, 11:53 PM   #7
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50/50 is the best mix for cooling (actually 100 percent water is the best thermally but boilover and rust is bad as well as freezing in the winter).
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Old 08-10-2004, 10:52 AM   #8
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50/50, Stant thermostat (drilled if possible with 1/16 inch holes.....2 of them so one doesn't get lonely), and burp the air out of the system. You didn't get any debris from the old gasket/seal into the lower intake when you cleaned it, did you?
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Old 08-10-2004, 11:11 AM   #9
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I dont think I got any dirt in the system when I did the water pum. I will drain some antifreeze and replace it with water and see if that helps any.
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Old 08-10-2004, 11:17 AM   #10
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Sorry, i had my numbers backwards.

But, here is the deal with antifreeze . . . as most of you know (and as Rogue said) water is the best for transfer of heat as it is "wetter" than the antifreeze. the primary purpose of the antifreeze is to increase the boil-over and freeze points. the 70/30 mixture gives you the best boil over and freeze capabilities (around 276f and -64f), BUT it does not give you the best heat transfer. the glycol does this by contaminating the water. it is much the same as if you try to heat plain water compared to salt water. the salt water because of the "contaminate" salt, will boil at a higher point and freeze at a lower degree. The second thing that antifreeze does for us is to aid in keeping the coolant systemfree of rust. if you ran pure water your engine would rust (of course the aluminum wouldn't but you get the idea). the cleaners in the antifreeze help keep unwanted contaminates off the radiator which aids in heat transfer.

With all of that said, why do they recommend 50/50? well, it gives you what the industry considers the best of both heat transfer and corrosion resisitance. by moving your percentages from there you can add more corrosion and boil over protection by increasing the antifreeze or you can increase the heat transfer by adding a higer percentage of the water.
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