A/C not blowing cold and temperature gauge staying at cold position

Welcome to 2CarPros.

I believe we have two different issues. If the temperature gauge never moves from cold in those temps, either the sensor is bad, disconnected, or there is a wiring issue.

Lets start with the gauge issue. Here are directions for removal and replacement of the temperature sensor. Before just replacing it, check the connection to make sure it is clean, tight, properly connected, and not damaged. The attached pictures correlate with the directions.

____________________________________

2007 Saturn Aura V6-3.6L
Engine Coolant Temperature Sensor Replacement
Vehicle Powertrain Management Sensors and Switches - Powertrain Management Sensors and Switches - Computers and Control Systems Coolant Temperature Sensor/Switch (For Computer) Service and Repair Removal and Replacement Engine Coolant Temperature Sensor Replacement
ENGINE COOLANT TEMPERATURE SENSOR REPLACEMENT
Engine Coolant Temperature Sensor Replacement

Removal Procedure

pic 1

1. Disconnect the engine wiring harness electrical connector (1) from the engine coolant temperature (ECT) sensor.

Pic 2

2. Remove the ECT sensor.

Installation Procedure

pic 3

Notice: Refer to Fastener Notice.

1. Install the ECT sensor.

Tighten the sensor to 22 N.M (16 lb ft).

Pic 4

2. Connect the engine wiring harness electrical connector (1) to the ECT sensor.

______________________________

Let me know if this helps. As far as the AC question, I will be happy to answer it. However, and I hate to ask, I need you to start a new thread specific to the AC. We are trying to keep the threads specific to one topic so it helps others. I hope you understand.

Take care and let me know if you have questions.
Joe