Remove the throttle body from the intake manifold.
Remove the IAC valve.
Remove the idle air control valve/coolant cover assembly screws.
Remove the idle air control valve/coolant cover assembly and the
gasket. Discard the gasket.
Clean the gasket sealing surfaces.
Inspect the gasket sealing surfaces for corrosion or damage that
would cause a coolant leak. Replace the idle air control valve/coolant cover
assembly or the throttle body if necessary.