If the blower fan only works on high it's likely the fan speed resistor is stuffed. It is screwed into the heater case behind the glove box.
How long since you've replaced the thermostat? It's a good idea to do them about every two years or so, and make sure you have the right mix of coolant in there. I'd also remove the radiator and back flush it with a hose really well to make sure there is no crap in it, and also that there is nothing stuck in between the condenser and the radiator like leaves, cat hair or whatever.
If you still have a clutch fan check that it doesn't spin too freely while you're stuffing about in there - if the viscous fluid in the clutch fan is too 'liquid' it won't push enough air to keep the car cool.
It's not likely the water pump will be stuffed, but if you do all that other stuff and it still gets too hot you may need to change it.
AU gearbox goes straight into an e-series no problems at all


Look at your car. Now back to mine. Now back to yours. Now back to mine. Sadly, yours isn't mine. But if you stopped buying dodgy cars and bought an ED, yours could be like mine. Look down. Back up. Where are you? ...You're on BoostedFalcon, reading the signature your signature could be like! Anything is possible when your car looks like my car... I'm on a computer.