Dear vp965,
Hope you're well. I'd replace the water pump and thermostat and refill with fresh coolant. I'd also change the oil and filter. None of these tasks is very hard or costly. Once you've drained the old coolant, fill and empty the cooing system a couple of times with ordinary water, until drained water runs clear. Then, re-fill with 50/50 mix of coolant and distilled water.
If the oil shows no signs of water infiltration - i.e., if the oil is not milky - and there's no steam coming out of the exhaust - the headgasket is likely OK.
Further, if the engine runs smoothly - despite the coolant leak - that's another sign the engine is in good order.
Hope this helps.
Yours faithfully,
Spook
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