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That sounds normal. Heater in the VE makes me carsick if I set it above 24 degrees.My ute got up third way on the temp gauge tonight and I was too damn hot. With the new core I sometimes have to turn the heater temp control down to nearly half if the outside temp is above 11 degrees.
Yeah this is why I think the OP's core may be buggard. Mine never got anywhere near hot enough before i had the core replaced. It was even worse when I first got the ute, before I had it semi fixed with a reverse flush and compressed air, but even then it remained fairly blocked and was pretty cold compared to how it is now. I was chasing the issue for over two years I think it was in the end. There is a long thread on here regarding my heater issues.That sounds normal. Heater in the VE makes me carsick if I set it above 24 degrees.
Check the little vacuum hose hasn't fallen off the heater tap.