heater fan works but doesnot get hot on 1997 Dodge Dakota

Currently the AC works, fan works temp selector works, but the heat and defrost doesnot get warm but fans works, even after engine running for 15 min. but engine temp show normal on gauge.(half way between cold and hot)

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2 answers 1 comment
Common problems with dodge's are the heater core. I would change the thermostat first.
Thanks, I rather hope that was not the problem, but I think you're correct.
Thanks for your help.
Flush baby flush
Pull rubber hose off of htr core in front of fire wall and atach garden hose