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DESCRIBE ISSUE....ok first is temp gauge is barely coming above roughly the 145 to 150 degree mark even though i just put in a new thermostat that is supposed to be a 195 degree one if i crank the blower fan all the way on i get luke warm at best if however i drop it one click its warmer but still not exactly making you want to take your coat off warm i am wondering if possibly the heater core may need to be flushed out?water pump looks to have been replaced not long ago i have only had the truck maybe 6 months also if it sits just idle the air coming out of vents does cool down not sure 100% what is going on
If the engine won't come up to temperature, there is little point to chase other things in the heater system; like core, valve, or blend-door. I can't think of anything that will prevent the engine from heating up properly except the t-stat or some mis-routing of the coolant lines. Even a problem with the coolant line routing is a real stretch, but coolant systems have become more complicated in modern times, so it may be a possibility. The t-stat is what I would look at, even though it is new...
Hmm... I just peeked at Rockauto listings for that t-stat. Some (the cheaper ones) specify "reversed poppet". What do you suppose that means? OP, what one did you put in?