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Old 03-20-2019, 04:47 PM   #1
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mk1 Zetec coolant bubbling after engine shutoff(video)

Here is a video of the event. Whenever the engine reaches 104-107C and I shut off the engine, a bubbling occurs in the expansion tank, it starts steaming and coolant evaporates from the reservoir cap. The bubbling is most noticable in the expansion tank, and the big hose coming from the thermostat housing. When the engine is a tad colder when it is shut off, this doesnt happen. I have changed the thermostat, thermostat housing, ecpansion tank and tank cap. Still nothing. Tried to let trapped air out by raising the front up with cap off, didnt help. Any ideas?

https://drive.google.com/file/d/10uk...ew?usp=sharing


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Old 03-20-2019, 06:21 PM   #2
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Quote:
Originally Posted by Alexandar View Post
Here is a video of the event. Whenever the engine reaches 104-107C and I shut off the engine, a bubbling occurs in the expansion tank, it starts steaming and coolant evaporates from the reservoir cap. The bubbling is most noticable in the expansion tank, and the big hose coming from the thermostat housing. When the engine is a tad colder when it is shut off, this doesnt happen. I have changed the thermostat, thermostat housing, ecpansion tank and tank cap. Still nothing. Tried to let trapped air out by raising the front up with cap off, didnt help. Any ideas?

https://drive.google.com/file/d/10uk...ew?usp=sharing
Have you replaced any of the cooling components, or did your car just start abruptly doing it?

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Old 03-20-2019, 07:26 PM   #3
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I am not sure I understand what you mean. The car started doing this by itself. Changed thermostat/housing, tank, cap trying to solve it but didnt help. Radiator water pump etc etc havent touched
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Old 03-20-2019, 07:53 PM   #4
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Edited to say that you answered my question.
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Old 03-20-2019, 08:03 PM   #5
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New question:
Have you recently started the car in freezing temps with only water (no antifreeze) in the coolant system?

If so, the veins of the pump could have broke.

Have you taken off the serp. belt and inspected/ spun all of the pullies?


Sometimes a brand new thermostat can stick.

A laser thermometer can make quick work of finding out where the coolant isn't flowing.

Take a reading of each hose.

I had a clogged radiator one time that gave me your exact issue.

You could rule out the thermostat by removing it and seeing if the problem still occurs.

Just spit balling ideas.


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Old 03-20-2019, 08:48 PM   #6
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Not holding pressure in the system. Normal temps will boil the water with no positive seal to hold pressure in as the pressure is what lets the coolant go to 265 degrees before boiling. Normal 212 boiling is 100C, obviously that won't work.

Watch the cap, I've seen them get tight when older from frayed plastic threads and then you cannot get it tight enough by hand to seal correctly. I have one car I hand tighten then take a big set of pliers to overtighten about 1/8"-1/4" to stop leaks and been forever like that. Found it boiling and then started popping hood after shutdown and finally heard the cap whistling from the leak.

Or you could have an oozing type leak in 500 other places.

Forget trapped air in a Focus, they self-bleed and by time stat is open they are bled or you did something wrong. Why the engines have so many extra seemingly unnecessary hoses.
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Old 03-21-2019, 05:36 AM   #7
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have you pulled the oil dip stick and made sure you dont have a white ish tinge to the oil? this could possibly point to a bad head gasket if you have whiteish tinge to the oil or greasy blackish tinge to the coolant.
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Old 03-21-2019, 08:45 AM   #8
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No milky color on the oil cap or dipstick. Suspecting either faulty(although new) cap, because I can hear it whistling and letting out steam(condensating into coolant drops), or water pump, broken impeler or seals. A week ago car developed a ridiculous whine from the pulleys, but it may also be the PS pump or alternator, doesnt necessarily mean water pump, maybe just a coincidence.
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Old 03-22-2019, 02:08 AM   #9
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There you go, zero in on that cap, which should NOT be making any noise unless your temperature gauge is elevated to an overheat.

Tighten it up, and if still noise the valve itself is leaking.
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Old 03-22-2019, 05:10 AM   #10
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if you're concerned about leaks from the block , try this product: https://www.amazon.com/Block-Tester-...a-570352767565
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