You should have at least one fan on when A/C or DEF is selected. You can disconnect the a/c compressor to prevent it from running so as not to create more heat from the condenser.
Your car is definitely running alittle warm. The General does want later model cars to run warm, say 200-210*F for better emissions.
One fan, like I said, turns on with A/C, the other is ECM controlled. So maybe the temp sensor for the ECM is bad, or the controlling relay for that fan is bad, or fan is bad itself.
May also have a clogged radiator, feel the fins of the radiator for cold spots with your hand after engine shutdown. May have a collapsed hose. Late opening thermostat. Hopefully you don't have the wrong water pump on your engine, with 70K miles, I doubt if you have had it replaced.
If this condition came on gradually, I suspect as others here, a leaky gasket. Either intake or head gasket. Pull dipstick and check for milk, hopefully, there won't be any.
When the shop does the cooling system pressurization, ask them to do a cylinder leakage test, or at least apply shop air into each cylinder on compression and check radiator coolant with removed cap for bubbles. A definite gasket problem if the bubbles appear, or crankcase fills with coolant. Check for the cleanest spark plug.
Everett "OBJECTS IN THE MIRROR APPEAR QUICKLY UPON RAPID DECELERATION"