Replace the radiator. Mine would heat up in a matter of minutes sitting in a drive thru, i cleaned mine time and time again, flushed, rinsed, even took it out and cleaned it.... sometimes they jut rot from the inside out and dont dissipate heat well. Mine can sit for hours now and be like a new car, rising to 220 and then dropping back down to about 200 when the low speed fan comes on. Even in 90*f Heat.
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