Changed the thermostat 3 times, last time put in a Dodge thermostat and no change, when you start it and let it sit for awhile, it seems warm, but when you get in and go it isn't warm anymore
Is the engine fan staying engaged? If so this will not allow you to build addequate engine temp. especially while driving.
Is it a electric fan or just a set of blades?
Just grab the fan with the engine off and try to spin. It should spin freely. If not then it is seized and will not allow you to build temp.
That would be the next step. Check the temp difference between the two heater core hoses to see if there is a major difference between the two.
We need to establish if the engine is building the proper temp. Hook up an external temp gauge to determine if the engine is building the proper temp. Also check the pressure that the cooling system is building by putting a pressure tester on the radiator and running the engine. I want to rule out a headgasket issue as well. Also follow the temp control cable from the dash to the valve and see if that is all working.
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I believe it is staying engaged but I can find out.
How would I know if it is staying engaged?
It is a clutch fan.
It turns freely. Could the heater core be plugged?
there is a little bit of difference but not much
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