Agree with Grey Ghost I, if you think everything else is OK I would try and flush the heater core.
I have a vehicle that had the same problem and when I finally decided to check the core, I back flushed and got trash out of it when I back flushed in the opposite direction of coolant flow. The heater now puts out much more heat.
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Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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