Quote:
Originally Posted by hyrum
How old is the car and when is the last time you had your radiator flushed? Could be that your thermostat is not working (so the coolant water is circulating just within the engine) or there is a clog in your system due to deposit of scale/gunk/whatever. I once had a car where the engine temp was plenty warm but the heater didn't heat well, turned out the lines had a bunch of gunk accumulated which was resolved by flushing the system -- I went so far as to remove a number of the hoses and clean them separately.
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It's a 99 Nissan Frontier truck. 80K miles. I've never had the radiator flushed.