Coolant doesn't leave Reservoir as it should.
What causes the coolant to pool in the
reservoir?. I personally had to replace the
engine manifold/valve cover gaskets then,
had to replace a crack coolant reservoir. The
car I'm sure was overheating before hand
and it still is in stop & go traffic due to it not
leaving the reservoir. I think it may need a
new radiator/water pump. The coolant
fan/electrical fan runs yet, it doesn't look like
it spins fast either.