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Fry Rice Specialist
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i drill it all the time whenever i change t-stat.
 

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Chapter Director Coordinator
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speedholes :rolleyes:
 

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He says: "This prevents one section of the engine from becoming warmer that the other".

Is this the only benefit of this? Seems kind of odd. :2huh:
 

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Discussion Starter #9
I have been having trouble getting all the air out of my cooling system and was told by a friend of mine that this would help. I never heard of it though so I was just wondering.
 

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The Parts Guy
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RAYBROADWAY said:
"This prevents one section of the engine from becoming warmer that the other".
That's not the reason for doing this at all. The reason behind drilling a small hole in the thermostat is to make it easier to get the air back out of the system when you fill it up with coolant.

"bleed"hole

-Rod
 

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Ok, I can see it now. Just seemed a little strange.
 

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It is nice
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to add to this, so air escapes easier try to postion the thermostat that the hole is at the highest point (ie. up, etc...) :)
 

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Actually, it also prevents hotspots from forming when warming up a COLD engine.
Air pockets in the block and heads would also cause one part of the engine from warming up faster than the other. :p
 

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Hell I'll give it a shot. Thanks.
 

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If Ford makes a Thermostat with a check valve there must be a reason. A ball check should only be installed in one direction. Flow from below going up. This means that they are allowing flow out of the engine. It has nothing to do with keeping one side of the motor cooler than the other. The purpose of the check is to remove excess air and prevent hot water from siphoning back into the motor. The latter will make the hole a bad thing.

Why not simply buy the Ford thermostat with the check valve built in it? :bangwall:
 

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I allways was under the impression that the hole was to prevent overpressuring the system when making" hard " runs while the stat was closed :xpwink:
 

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The hole is there for a reason. Remember, the water pump is turning whenever the engine is running. Ya gotta give that pressure somewhere to go, t-stat open or not.
 

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Discussion Starter #19
The stat I got from the parts store had no check ball. The Ford one may. I'm going to check. If it does I'm going to replace it with the Ford one.
 
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