With the engine cold, remove top & lower hoses, remove thermostat housing and disconnect heater hoses, using low pressure water from a garden hose, first flush the heater core, then flush out the radiator and the block, do this until all water runs clear, replace the hoses and fit a new thermostat, replace the coolant and ensure all air is bleed from system, pressure test for any leaks.

mark (mhpautos)

Answered by mhpautos (expert)
26,913 answers provided