Originally Posted by Jim Stephens

Yes on possibly the head gasket. Did you run that test you can get from Amazon to see if there is carbon dioxide in the radiator fluid?

https://www.amazon.com/Block-Tester-...9040969&sr=8-5


This last time, it took me three tries to get the radiator completely clear of air bubbles. Random over heating in fast food lines. I did though, eventually discover the REAL reason it was a problem for me this time around. There was a tiny leak in one of my radiator hoses and over time I was loosing fluid and of course air was being introduced into the system. The way I found it is was to use this:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

So, you pressurize the radiator cooling system, grab a light and take the shroud off the bottom and start looking for fluid. Actually, by the time I jacked the car up, put in some more fluid and took off the bottom shroud I easily spotted it. Here it is, the yellow hose that was clear of the A/C flywheel, but was flexing under load and slowly a pin hole was created. I had used this hose for 9 months before it failed, so never even considered that my problem would be a leak. I went back to a Rigid black OEM hose to solve it permanently.





Like everyone else has already stated Jack the front up super high, put this funnel on and run it up and down with the heater on at all times. I set the timer on my phone and go a minimum of 30 minutes. A fair amount at 3k rpm as it says in the manual.
https://www.amazon.com/Kauplus-Radia...xpY2s9dHJ1ZQ==