Not-so-great heat, running a little cool (I think)

Winks42 said:
I had the same issue, replaced fan clutch, tStat, flushed heater core and even fixed a broken blend door and nothing worked. I recently spent the $20 and go a new coolant temp sensor and it fixed my issue.
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Yeah that's about all that's left for me. My heat is good now though because when I changed the heater core I pulled out about a cubic foot of nesting material, blows nice & hot, it's just the temp value that's annoying me.
 
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It is not likely that the fan clutch is the culprit. First, if the fan clutch was locked up the constant roaring noise should be a dead giveaway, plus noticeable loss of power. Second, a locked up fan clutch can't override a properly operating thermostat to make the engine run too cool. By far the most likely culprit is faulty or too cool rated thermostat. A distant but possible second is a malfunctioning temperature sensor/sending unit.
 
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