Sizzling Sound - GTX 4 Tec 155

[jimraab]

I just replaced a hose clamp and added all new coolant. I took it out and it ran fine, but every so often I would stop just to check the coolant level. The coolant level was fine, but I could hear a slight sizzling sound coming from the engine. I don't remember ever hearing that in the past. I could not see anything leaking and the engine temperature was fine.

Any thoughts?

 

[jimraab]

Is the cooling system on the 4 Tec pressurized?

 

[Dennis]

Could be you are hearing some small air bubbles making their way out of the system. The engine cooling system is pressurized just like your car. That is a pressure cap on top of the coolant tank so be careful if you remove it and the engine is warm.

 

[jimraab]

Dennis,

I took the cap off yesterday while the engine was hot with a large towel, but there was nothing at all that came out. I would assume meaning no pressure. Could the sizzling noise be a small leak somewhere within the coolant system? I will have to keep an eye on the level when I take it out again.

Really appreciate your input!