If you don't want to go to the trouble of wrapping or coating exhaust components, you could always try making some heat shields.
Get a sheet of ali which is an excellent conductor of heat and see if you can bend/cut yourself out something to shield the turbo and or exhaust manifold (ali is soft). You could use existing bolts to hold it on. The aluminum will absorb the heat and help prevent it rising and spreading it around the engine bay. I made a few of these up for a Rover 600 ti i used to have and it worked really well.
The intercooler won't reduce under bonnet temperatures, only the intake temperature. Its a performance/efficiancy device rather than a cooling device.
If your temperature gauge is reading hot, a good back flush out of the cooling system is probably in order. Silt builds up in the lower parts of the system over time gradually reducing it efficiancy.
Favourite places for it to settle are:
In the engine block. In extreme cases (if back flushing is unsucessful) removing the core plugs and jabbing some wire around inside to disturb the silt, then flushing out with a hose may be required. This is not expensive, core plugs are dirt cheap, but it is labour intensive.
In the bottom of the radiator. Removing the radiator and flushing it both ways with a hose will be needed. Also, you can plug the bottom of the radiator and fill it with a caustic soda solution overnight. It may be easier in the long run though to fit a new/recon radiator though.
I had a BMW once that kept blowing head gaskets. I took the rad out and flushed it all out and it seemed ok. It wasn't though. It was only flowing at 30% and causing the engine to overheat....
Again, look at the thermostat and test it in a saucepan on the stove. It may be sticking or not opening all the way...
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