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Old 01-16-2011, 06:25 PM
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engine too cool

my car doesn't get past 165 degrees with a 195 thermostat. could I have bad thermostat its a Mr gasket 195

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Old 01-16-2011, 06:30 PM
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It is possible.

Check your gauge also, it could be wrong, especially if it is a factory gauge.
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Old 01-16-2011, 06:34 PM
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its a aftermarket gauge..
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Old 01-16-2011, 06:41 PM
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Is it a "high performance" thermostat?

I tried a Mr. Gasket HP 180 degree thermostat a few years ago and my car only ran about 160. I put it in a pan of water and started heating it up and it began opening a lot sooner than a standard 180 degree thermostat.

I went back to a standard 180 made by Stant and it maintains temp between 180 and 185 in all but the hottest weather.

John
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Old 01-16-2011, 07:03 PM
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yes it is the high performance one. and will the temp raise if I used antifreeze instead of straight water
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Old 01-16-2011, 07:45 PM
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Quote:
Originally Posted by whojohnjones
yes it is the high performance one. and will the temp raise if I used antifreeze instead of straight water
Are you serious? Using straight water? I tried 3 different thermostat's once on my 350 before I realized the chrome housing on my edelbrock performer RPM was too large and the stat was actually loose inside it and coolant was going around it enough not to let the engine run warm enough. I had to change back to a painted stock housing. Another good way to tell if your gauge is not right is the heater won't get hot. It will get warm but not toasty. I figured it out by borrowing my son's laser temp gun and shooting the thermostat housing. It did good to get to 170* and that verified that the gauge was right. I used the port on the intake runner next to the them. housing, not the head. It's been said on here that some after market gauges are as much as 15* off. As far as using straight water, you should use at least a 50/50 mix given your geographical location.
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Old 01-16-2011, 08:51 PM
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does anybody know about how much more hotter its will run with the 50/50 mix
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Old 01-16-2011, 08:57 PM
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It won't run any hotter with 50/50. The antifreeze raises the boiling temp. but won't change the temp. You should check the actual temp. with an accurate thermometer, and is it is really running cold, the thermostat is the wrong one or defective.
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Old 01-16-2011, 09:05 PM
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Anti-freeze does not change the boiling point of water. It does keep your water from freezing(and possibly cracking your block), and it supplies lubricant for the water pump, and anti-corrosives to keep the metals of your cooling system from corroding.

Straight water under 15-16lbs of pressure will boil at 265*
Water/Antinfreeze at a 50/50 mix, under 15-16lbs of pressure boils at 265*
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Old 01-16-2011, 10:57 PM
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Quote:
Originally Posted by FmrStrtracer
Anti-freeze does not change the boiling point of water. It does keep your water from freezing(and possibly cracking your block), and it supplies lubricant for the water pump, and anti-corrosives to keep the metals of your cooling system from corroding.

Straight water under 15-16lbs of pressure will boil at 265*
Water/Antinfreeze at a 50/50 mix, under 15-16lbs of pressure boils at 265*
Nope. At ATM Pressure Water boils at 100C, Ethylene glycol boils at about 198 C

A mixture of the two will have a boiling point higher than water alone. It's not a perfect mixture so it's not right in the middle, however it is higher than water alone. It's usually about 40*F higher at ATM pressure and a little more under system pressure.
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Old 01-17-2011, 05:42 AM
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All things being equal, straight water in the cooling system will cool the enging better than a water/antifreeze mix. About 5-10 degrees cooler. Whenever I build a new engine, I run it for a few hundred miles with just water, to make sure there's no leaks. Antifreeze is expensive and makes an awful mess if there are leaks. Once everything has checked out, I drain the system and replace it with a 50/50 mix of distilled water and antifreeze...and the temperature difference is noticable...5-10 degrees warmer...
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