My 2008 equinox is over heating. We have replaced the water pump, fan, and thermostat, and it still overheats sometimes coolant level is okay, and if I blast the heat it makes it a little bit better. What would be the next problem to look at please?

Have you actually verified that the fan turns on? Does the fan turn on when you turn the air conditioning system on? Does the problem occur cruising more, or in start and stop traffic more? Have you ensured that air pockets of the cooling system have been properly purged out after having replaced multiple components?