RE: 240 Engine temp
I've just had a long thread on overcooling on the same model, but in the course of giving the system a good going-over I have found a few ideas that might be relevant.
1) Get a new temperature sender - the one in the block under the inlet manifold. Make sure that the temperature you are observing really is correct
2) test the thermostat in a pan on the hob with a thermometer, to check that it starts to open at the right temperature, fully opens, and doesn't stick.
3) flush the whole system. Then remove the radiator, plug the holes, and fill with hot soda solution. Slosh it about for a few minutes, then THOROUGHLY flush out with a hose.
4) the hot smell may be merely a little seapage of coolant or oil finding its way onto the manifold or exhaust. Try watching it running for a few minutes.
After these, you have to start thinking about the head gasket, but try the cheap and easy things first.
Good luck!
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