Changed the thermostat still doesn't heat - 1997 Jeep Grand Cherokee

Parked or moving both? ?
why not post symptoms,??? and ask for real help not wild guesses.????????? real as in diagnostic?
my guess is the HVAC system heater i dead? dead cold on all modes and the power works on HIGH?
right?
ill guess, heater cold on fast fan.
here are the checks (I use a scan tool for ECT temp )

1: first i touch the top rad hose is it too hot to hold hand there.?
yes, that is 180F to 200F there. so is good, if not fix THAT First.
2: then step 2, heater core hoses, 2 hoses there hot same rules.
yes, no?

ill stop here,, but this is first.

first is engine heat, changing thermostat if engine hot, is a waste of time. and cash.
the engine heat can be seen 4 ways
1: dash gauge, at normal. (if don't know normal ,all this wasted)
2: IR pyro gun, check. best. a $15 tool. ends guessing .
3: scan tool ECT shows, 180F more, passes tests very good method here and is free if you have any scan tool.
4; hand flies off hose test. crude but effective, if not sure try on car that works, now you know where 180F is. "experience":