Coolant temp will reach 240 deg. F at idle. coolant level is good. Both fans are running. Any Ideas?

How old is the coolant? You may want to try a coolant system flush.

Sticky thermostat.

coolant is about 6 months old.

i usually try to clean the rad fins and cond coil too. i take the fans out and spray it with simple green and back flush it with a hose.

240 on a gauge or a scanner? Our gauges aren't the most accurate and scanning may show that the temp is around 230F. In traffic that is where the fans are programmed to run in high speed mode.

fins and coil look clean. read 240 deg. on my scanner. Also noticed that when I shut it off it seemed to bubble back into reservoir. This worries me!!! Any suggestions need help. Could this be head gaskets?????

going to go buy a new radiator cap and thermostat in the morning and try this.

You are on the right track. HG'* are very uncommon. Meaning you have a better chance of driving off a cliff, getting struck by lightening and married all at the same time.

Tried new radiator cap and thermostat and this did not help. Still running HOT. Must be head gaskets. Anyone know what this might cost????