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Re: overheating. Not sure what the issue is
Check the heater return hose. It should get warm before the upper radiator hose since it bypasses the thermostat. If the heater return dumps into the radiator, you can check for flow there.
If your heater returns to the water pump, as a test, remove the thermostat, and recheck your flow. Should see lots of flow as soon as you start it. If you have good flow, replace your old thermostat with the new one you bought before performing this test. The old thermostat could be the cause of your problems.
If no flow, you probably have a dead pump.
If the light is still on when the engine is cold, replace the sender as well. Be sure to get the one for an idiot light as the sender for a gauge is NOT interchangeable.
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