Hi marty10,
We see you're having issues with turn-by-turn directions not being audible, just written. We certainly understand the need to be able to have that be audible, and we'd like to help out.
We'd recommend starting with this page here: Change audio settings for turn-by-turn directions in Maps on iPhone
On this page, be sure to check out the steps on changing the audio output. That'll help to ensure that it's routing the audio as expected, whether it's to Bluetooth or the iPhone itself. Try adjusting that and see if changing it to output from the iPhone alone helps, which would isolate this down further.
Also be sure to follow the top section on the above link, "Turn voice directions on or off or change the volume", to ensure that it's enabled.
Take care!