Baker22

Temp gauge, goes in the red(while Highway driving) the overflow tank is full/filling up, and if i take the radiator cap off it bubbles air into it, and slowly fills the coolant back in the radiator again. If i drive just in the city, it just stays out of the red and goes up and down(temp gauge).


symptons;
Coolant temp is not really hot
oil looks normal, exhaust fumes normal
heater is not blowing hot air
engine head is not hot.
Car got the same power as usual


Can it be a bad heatercore, what doesnt make the coolant circulate good? Tia

markfothebeast

Clearly a headgasket issue judging from the air bubbles. Common on the 3.4L. Any further driving and you'll cause additional engine damage.

There's a small chance the water pump has failed. Highly doubtful if you have bubbling. This is exhaust blowing out the headgasket in to the coolant.

The reason you may not see coolant exiting the exhaust is because the catalytic converter can mask the problem.

Baker22

Thanks for the answer. Now when i start driving, it runs on only a few cylinders and gets normal after 1 minute, 5 min. later same story. Time for a new car

markfothebeast

There is probably low compression on some cylinders causing a misfire.

Have you considered replacing the gaskets yourself? It is not impossible with the wealth of information available online. With some basic tools you can do this yourself. You'll end up spending $125 - $200 having the cylinder heads resurfaced. You'll need a gasket set which isn't too expensive.