well this might make you happy, you might want to try something as simple as changing your radiator cap. I had it this morning while delivering my newspapers same thing stop and go, and it started to overheat, i would quickly turn on the heater before it got to hot. So i figured the car runs same as always, its this humid weather that has changed, so maybe the cap is bad, and its not pressurizing the system to the point of get full cooling capability. So changed the cap, rode her up and down hills for awhile, then started to stop and go, stop and go through the neighborhoods by me, and then i just let her sit idling, cause once she started to heat up even after i turned the heat on, and she cooled down, once i turned the heater off and let it idle it would start to raise up, everything is great so far.
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