Poor heat with my 2002 Ford Ranger 2.3 L?

Kurt S

New member
The temperature gauge reads about half way with heater off but when I turn on heater the gauge drops alot and poor heat.And when I turn heater off it will go back to normal temp reading. I have replaced thermostat,heater core,flushed system.When it is warm outside it will blow good heat and gauge stays where it should now that it is getting colder out I have this problem.
 
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