Posted by Determined on December 28, 2015 at 11:44:35 from (216.130.212.81):
In Reply to: 3.7 engine temp help posted by old560 on December 28, 2015 at 06:46:48:
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Gauge and heater temp output sound like they are moving parallel so we can rule out a faulty gauge or sending unit.
Low coolant level would be possible cause of low heat when accelerating hard up a hill. The higher RPM combined with the increased angle can lower the level of coolant thus starving flow to the heater core, the level in intake coolant passage may drop lower than the sending unit thus giving a false reading,
Low coolant.
Stuck thermostat.
Upside down thermostat.
Defective thermostat.
Fan clutch issue.
Not much else in the equation, start with double checking the coolant level.
If you are sure the fan clutch is good your next step would be go back to the basics.
Pull the thermostat, put it and a thermometer in a pot of water on the stove and verify the temperature it is opening and closing at.
A proper functioning thermostat is there to keep your engine warm just as much as it is there to keep it cool.
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