Quote:
Originally Posted by jarrod27
If the impeller was rotted out then his engine would get hot not cold due to no coolant flow.
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Quote:
Originally Posted by FireRanger
On the 4 cylinders, the sensor and the heater core are on the same line. They are the highest and farthest places for water to be pumped. When the impeller is starting to rot out, the heater core and sensor lose circulation first. While still maintaining enough circulation to the rest of the block to not overheat. Fluctuations in flow and temperature is a common sign of this.
This is detailed in the troubleshooting guide. With pictures.
So his problem could be either or both.
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I am praying it is the thermostat. I am going to get the parts tomorrow, so I'll keep ya posted. Appreciate your time, help and advice.