As above - H/G failure is very rare on these unless they've been properly cooked by running with bad overheating. Beware the low temperature reading, this could be due to the coolant level being below that of the sensor, it could still be overheating.
Re. cleaning the system out, a good trick that definitely works is to rebuild the system, then run it for a few miles with a mixture of clean water and clothes washing liquid in the system, this is pretty good at dissolving the oily residues and leaves it a lot cleaner. You may choose to drain this and do it again, with a final drain/refill of the correct coolant antifreeze mixture.
I'd recommend fixing this pronto, and don't run it any more until sorted.
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