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Discussion Starter · #1 ·
Greetings to all, I have a ford escort cvh motor vehicle. My engine does not warm up even though the thermostat is working properly in my vehicle. When I examine the thermostat body, there is a water flow to the radiator through a 10 mm hole independent of the thermostat. Please help me what to do.
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Discussion Starter · #7 ·
There is a ball inside that melts if it gets too hot. This may be your issue.


What brand thermostat was used?
Oes brand thermostat was used. As far as I understand, there is a constant water passage because the ball inside it melts. So, do you know how I can fix this? I don't want to buy a new thermostat housing
 

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From what I’ve seen housing replacement is the only option. I would either get a housing from a junkyard or see if rockauto still sells motorcraft ones. I didn’t have good luck with the aftermarket four seasons one
 

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Discussion Starter · #9 ·
From what I’ve seen housing replacement is the only option. I would either get a housing from a junkyard or see if rockauto still sells motorcraft ones. I didn’t have good luck with the aftermarket four seasons one
Is there any way to repair it. Would I have any problems if I completely covered that little hole?
 

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Not sure if it would be safe to plug the hole completely, but I'd try plugging it with epoxy (or a pipe plug) then drill a 1/16" hole (1.5mm if you are somewhere that uses those French units of measure) through it.
And keep an eye on the temperature for a few days to make sure it doesn't do anything weird.
 

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That hole is a breather of sorts, it lets coolant/air past the thermostat because many thermostats don't have a breather hole. That passage in all our cars have a check ball in it. As the passage fills with gunk & debris you eventually won't hear the ball rattle, if it doesn't make a sound when you shake it that's a dead giveaway you have problems.

Like the guys said above, the later engines (in North America anyways) can melt the check ball in an overheat. In the 1990 & older engines this is not the case.

The last thing you want to do is plug/fill that passage or coolant & air bubbles won't pass the thermostat as designed.

If your engine is running too cold you should make sure the thermostat isn't too low (185F and lower is too cold for winter driving) otherwise your engine might be running too rich or radiator fan is stuck on.
 

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Discussion Starter · #12 ·
That hole is a breather of sorts, it lets coolant/air past the thermostat because many thermostats don't have a breather hole. That passage in all our cars have a check ball in it. As the passage fills with gunk & debris you eventually won't hear the ball rattle, if it doesn't make a sound when you shake it that's a dead giveaway you have problems.

Like the guys said above, the later engines (in North America anyways) can melt the check ball in an overheat. In the 1990 & older engines this is not the case.

The last thing you want to do is plug/fill that passage or coolant & air bubbles won't pass the thermostat as designed.

If your engine is running too cold you should make sure the thermostat isn't too low (185F and lower is too cold for winter driving) otherwise your engine might be running too rich or radiator fan is stuck on.
Thank you very much for your reply. My thermostat is at 189 F. Is there a way to put a new ball inside the thermostat body?
 

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you need to replace that thermostat housing. its not heating up because the bypass is melted allowing a constant flow of coolant past the thermostat, because the engine overheated at some point in the past. it is a fail safe to keep the engine from catastrophic over-heat. there is no way to repair it. it must be replaced. also judging from your picture, looks like there is a ton of rust inside your engine..
 

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So why wouldn't restricting it down to a 1/16" hole work?
Air bubbles could still work through, and it shouldn't be enough of a bypass to keep the engine running cold.
It would imitate the little hole found on some thermostats.
 

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So why wouldn't restricting it down to a 1/16" hole work?
Air bubbles could still work through, and it shouldn't be enough of a bypass to keep the engine running cold.
It would imitate the little hole found on some thermostats.
the bypass has zero to do with air bubbles, those pass through the system when the thermostat opens. you should never have air bubbles in the system anyway, unless it is a fresh fill, or there is a massive leak. the bypass is only used when the vehicle over heats, melts the wax pellet, and allows coolant to flow continuously. these were made this way before they had 'fail open' thermostats. there is no reason to mess with it, needs to be replaced. looks like it is full of rust anyway, and this will probably keep happening until the OP corrects the rust and overheat conditions.
 

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Discussion Starter · #16 ·
the bypass has zero to do with air bubbles, those pass through the system when the thermostat opens. you should never have air bubbles in the system anyway, unless it is a fresh fill, or there is a massive leak. the bypass is only used when the vehicle over heats, melts the wax pellet, and allows coolant to flow continuously. these were made this way before they had 'fail open' thermostats. there is no reason to mess with it, needs to be replaced. looks like it is full of rust anyway, and this will probably keep happening until the OP corrects the rust and overheat conditions.
I came across a video like this, do you think it's a logical solution?
 

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do you think it's a logical solution?
the logical solution, would be to replace it. can you post a few more pics of your current housing? does it look like the one in the video?
 
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