Temperature Gauge drops and A/C stops blowing cold air

[Randalledelphia]

Hello all, my 2014 will be at normal operating temperature and occasionally the temperature gauge will drop to the bottom of the scale and the fans turn on and then the AC will stop blowing cold air. If I shut it off for 30 seconds or so. It will then go back to normal once I restart it. Then it’ll happen again a short time later. Codes that are being set are P0118 and P0119. My guess is the ECT sensor is the culprit but maybe it’s something else? One other thing I have noticed is the lower radiator hose at the thermostat housing will be cool to the touch, when the fans are running like the thermostat is stuck closed not allowing the coolant to circulate. I have changed the thermostat, but that did not solve the problem.

 

[OnlySonoma]

I would change the Engine Coolant Temperature sensor, I don't think they're too expensive. Sounds like it could be faulty and sometimes gets a false reading. I believe its located to the left of the upper rad hose.
Also, depending on the how the actuator works for your AC settings, there could be a negative vacuum hose line that runs from the intake manifold in through the firewall to an actuator.
I would check the sensor and look over all vacuum lines.

 

[Randalledelphia]

Thank you, the ect sensor is just left of the dipstick tube, down on the side of the head .