1988 Gmc S15 Bought Weeks Ago Overheating Replaced Thermostat Water Pump Still

1988 GMC S15
150,000 MILES
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When I bought it it a few weeks ago it was overheating, I replaced the thermostat and the water pump and it is still overheating, the fan is a thermostat controled fan and it seems to be fine and I see no problems with radiator flow. I am stumped
Oct 19, 2012 at 4:15 PM
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JDL
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Besides the temp gage, any signs of overheating? Is the coolant reservoir over-flowing? You can see coolant flow through the radiator? You may need to flush the cooling system? Could be air in the system? Combustion gases in the coolant?
Oct 19, 2012 at 5:18 PM
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