Gurgling from the coolant reservoir tank

Good morning,

Yes, this sounds like a failed head gasket. You are burning coolant and that is why it is bubbling in the tank and smoking out the exhaust.

https://www.2carpros.com/articles/white-smoke-or-steam-coming-from-the-exhaust-pipe

https://www.2carpros.com/articles/head-gasket-blown-test

Removing the thermostat makes it worse. You now have starved coolant circulation in the back of the motor.

https://www.2carpros.com/articles/how-an-engine-thermostat-works

At this point, I would suggest replacing the motor with a rebuilt or a good used motor.

Roy

Thank you for your response to my question, but there is no white smoke coming from the exhaust it was just those two instances and I didn't leave the thermostat out, I replaced it I would never run an engine without one. The only symptom of a blown head gasket is the gurgling in the coolant overflow tank.

Okay, got it. The fact you had the white smoke is the confirmation along with the gurgling that you have a head gasket issue.

I would remove the heads, have them tested and inspect the gaskets for failures.

I attached a YouTube video or replacement of the head gaskets.

https://www.youtube.com/watch?v=wFgLtP_NSsg

Roy

Thank you. I was hoping it wasn't the head gaskets due to the fact that I was not looking forward to removing the heads and the gaskets.

You are welcome.

always glad to help.

Roy