2012 4.6 Overheating problem

Looking for some input on my truck cooling issues. Started to "gurgle" out of the reservior but no indication of overheat, refilled reservior twice but no indication of leakage. Ran good a couple of days then started to show high temp on engine acceleration. Changed cap, filled reservior and found about half of reservior level the next day.
Appreciate any input on where to start, thanks

 

Check under the truck where the transmission housing meets the motor. If you see dried pink drips then it’s leaking from the intake valley.

 

Thanks for the response, no indication of leaking. The crazy thing is there is no indication of overheating issues anymore?!

 

Might need to check your thermostat. Could be getting stuck closed intermittently

 

Was your old radiator cap whole? Or was there a chunk missing??

IF there's a chunk missing you may want pull some hoses and look for it. Look up pictures before you go down this rabbit whole though to get a better idea where it might be.

Best case, you may need to just burp the system.

 

My radiator cap showed some corrosion but it was all there. I replaced it because of this, but also noticed the lower part was separating from cap. I have been planning a drain and fill for the system since in doing a little research apparently the Toyota coolant can get acidic after aproximately 50,000 miles. I am not the first owner and the truck has 147,000 on it now. I have driven about 60,000 sinc e getting it. Thanks for the help!