Changing the water pump and thermostat on a 1997 GMC Safari, similar process on a Chevy Astro. While I was "there" I changed the bypass hose, both radiator hoses, and thermostat water outlet. The hardest part of the job is to loosen and remove the fan clutch nut. 4.3 vortec.
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How to Service the Cooling System on Chevy Astro / GMC Safari
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