1979 Chevy Truck water pump vs. radiator

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ANSWERMAN50
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Engine Cooling problem
1979 Chevy Truck V8 Two Wheel Drive Automatic

How do I tell if the water pump is pumping or if the radiator is clogged? I replaced the thermostadt, but the engine starts cold and within 5 min is registering hot on the guage. I turned the heater on and the guage dropped slightly, but then climbed back up to hot.
Mar 14, 2010 at 12:00 AM
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ANSWERMAN50
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If I had a repair manual I wouldn't be on this site.
Mar 14, 2010 at 12:04 AM
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