There just arent that many components in the cooling system, if you think about it. Sit down and run them through your mind, one at a time. Then go for the most logical one.....then the next, etc. Belt slipping. ( the alternator would not be charging well, if that were the case), thermostat..( maybe...new or not)....clogged radiator...( possibly, so to eliminate it, try flushing it again), temp sensor...( cheap fix)...waterpump...( PITA to swap, but not expensive). I've had to swap each one of those components over the years at one time or another on mine. Good luck !
On 7th PCM. Finally got a good one.