2013 polo vivo water reservoir boiling

[TheChamp]

I've tried this as well, with a new reservoir bottle.

You can also go to a radiator place ask for a pressure test on the coolant system, it will easily pick up if there's a leak, rule that one out and move on to something else.

 

[TheChamp]

 

[TheChamp]

 

[WesleyDB]

Unfortunately from all that you say, if you can't find any leaks anywhere, then it's either going to be your head gasket or cylinder head.

 

[upup]

a friend had a problem years ago, after they remove the head the found there was debris in the water lines, blocking the water flow.

 

[TheChamp]

a friend had a problem years ago, after they remove the head the found there was debris in the water lines, blocking the water flow.

People still think antifreeze is optional.

 

[Dairyfarmer]

Is it just owners

Wanna be BMW drivers?

 

[Kodi]

My first thought is water pump.

My second thought - and cheapest cause, not enough coolant, and the system is experiencing cavitation, thus not capable of moving water through heater matrix.

The temp probe must be submerged in water at all times else the temp gauge will give a false lower reading. Your fluctuation could mean water is sloshing around at the probe causing up and down reading and suggesting coolant level too low.

Are you certain the system is fully full and bled? You will smell coolant aroma (sweet smell) in the exhaust fumes or engine bay area if you had crack and is escaping or burning off... 100% you would smell. That's supposing you actually using anti freeze.

At operating temp, is the main radiator pipes pap or under pressure?

I would remove thermostat and test again. That thing could stick closed or not fully open. Remove it temporarily and do more runs...

 

[SachR1]

Hi guys just an update; solved!

I parked the vehicle level and checked for a leak - heater valve was cracked and leaked coolant from there. However, upon replacing this I decided to do a service. Whilst removing the spark plugs, they broke in place leaving behind the thread on the cylinder head - guess from the over heating, I was able to remove 2 successfully. I attempted to remove the broken threads using an ez out, the first was successful. The second attempt broke the ez out . Cylinder head removal time. I ended up doing a complete cylinder head gasket replacement including all other oil seals, gaskets and water pump. Found a load of sludge stuck in the timing chain cover and areas below the oil filter - note the oil that I removed from the sump was clear and had no signs of oil and coolant mixed. Proof that the first guy who worked on this vehicle did not do his job correctly. I used an air compressor with an oil can and petrol and blew out every single oil crevice I could find around the timing chain cover area. Put everything back together, started and runs like a dream.

Thank you guys for the help. It was exciting for me as this was one of the first cylinder head gasket replacements I've done even though I thought this would be a much easier fix initially.

 

[Willie Trombone]

Water pump failed?

My first impression too.