2012 3.0 audi q7 overheating

[Sammyebby]

Overheats under pressure temp needle is up and down and heaters go cold.

Started with a leaking water pump replaced that and it still happened under pressure.

Replaced numerous parts still the same overheating.

Only bled the coolant with screw on top of the engine could this be the problem needing to be bled with the proper bleeding kit or could it be something more?

Any help Is much appreciated 

[Steve Q]

I'd definitely recommend having the system fully bled first. Then check all rubber coolant hoses.