97 honda accord running hot at idle?

I have a 97 honda accord that was running fine until it got hot outside. It runs fine in the mornings at abt 50 degrees or less. In the afternoon abt 65 degrees or high it starts to get hot at an idle or stop. And by that i mean it goes past the middle line. I just got it back from a mechanic they replaced the whole fan motor and also found a bad oil leak and replaced the vtech valve. I drove it back home abt 35 min away and the car did well until i got abt 5 minutes home through red lights and it started running hot again. It didnt go to the red but it went a little above the middle and highest being between hot and the middle line. I called the mechanic back and he told me to run the ac while i drove home to see if that would help the fans kick on. While running the ac if at a stop it stayed a tad above the middle line. What could this be? After i turn the car off you can hear the fans on.

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