2005 Equinox 6 cyl.all wheel drive,problems with it overheating.Changed out the water pump,temp sensor,thermostat and also had it flushed out.start-up ok then get driving it then the temp gets hot. Stop and turn car off and within a few minutes the indicater is about half.So am I looking at having to replace head gaskets next??

I am not familiar with that engine but check the waterpump bypass. It may be a port in the block behind the waterpump or a hose on the pump. but it may be plugged. The engine needs cerculation even cold.
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Head gasket can be checked by installing a clear hose on the overflow tank. Run it up to your windsheild so it lays a few inches up to where it can be seen by a passenger while driving. The hood can be closed on it but make sure its not pinched all the way off . When driving you will have continuous bubles more durring acceleration. If its clear then not a head gasket.
Try googleing the year and engine plus head gasket problem or water pump problem see if others had had a common problem on that year and model. Its easier to diagnose your problem when you know most common causes first. After then you check less common.