This is just me, but if I knew my water pump was weeping, and possibly the thermostat was bad, I would start with all that first because you need to drain the system anyway. Then, I would refill with NEW coolant . Rather than hoping it was just air, or possibly just the thermostat. It doesn’t make sense to me to possibly have to do the job twice. Parts are pretty cheap. It’s been sitting a while.
But that’s just me.
Regards Brian
But that’s just me.
Regards Brian