What does a sound like water boiling mean?

Answer

Yeah it could mean a waterpump is bad, but not likely, you best get that overheating taken care but quick. It should never overheat or serious, expensive damage can occur. DON'T DRIVE IT WHEN IT IS OVERHEATING OR GAUGE GOES INTO THE RED ZONE!!!!

Answer

It may be as simple as bleeding your coolant system; i.e. find some place on top of block where you can allow coolant to escape while pooring coolant in. I had this problem on my jeep and bled the coolant system by removing temp sensor on top of block then filled the coolant until it overflowed without hesitation. Then re-inserted the temp sensor. P.S.: this also caused my jeep to overheat and miss. The missing was caused by the computer sensing the wrong temperature when it was trying to adjust the fuel injector air gas ratio. In some vehicles, you must bleed or you will get air pockets when you allow it to run low on coolant then re-fill.

Answer

I have an old 88 Ford Taurus wagon that had a sound like this. I had it checked out and it turned out to be bad bearings in the water pump. Also my fan motor burned out and the switch to turn it on and off also failed.

So I had to get a new fan motor, switch, and water pump. So it's not always best to just assume it's the thermostat, although this is a cheap solution if it turns out to be the problem. I did try adding more coolant but that just did nothing. I just had my radiator flushed (30000 miles) and the coolant was practically new. Hope this helps.

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