My air does not work and the doors will not lock also controls such as gauge and temperature gage no longer work

Hello. It seems the PCM unit on your car is defective/malfunctioning. On some vehicle makes and models, the PCM and ECM are 'integrated' in one unit. Other vehicles, there are separated. The PCM controls circuits like the ones you stated. I'd have the PCM 'checked' first then go from there. Good luck and keep me informed; if you want to.

The most likely culprit for the gauges would be a connector at the back that needs cleaning with contact cleaner. However with the issues with door locks and gas/trunk locks, I am going to guess the Body Control Module. For jobs like this, you really need a good auto-electrician or our Expert Jeff Armer. I'll try and tag him.


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Are any DTC'S - diagnostic trouble code's stored in any module ? BCM - body control module , PCM - engine computer ,IPC etc.... It's the temp. gauge not thermostate gauge Did it work after replacing the thermostate an coolant temp sensor ?
Engine Coolant Temperature Gage
The instrument panel cluster (IPC) displays the engine coolant temperature as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the engine coolant temperature. The engine coolant temperature gage defaults to 38°C (100°F) if:
• The ECM detects a malfunction in the engine coolant temperature sensor circuit.
• The IPC detects a loss of serial data communications from the BCM.

The first thing too do would be to hook up a factory or some other type of professional scan tool an see what the temp. sensor is telling the engine computer an if the BCM is showing the same temp. data . And is that info. getting to the instrument cluster . Knowledge of how it all works an proper diagnostic technique is the key to finding the problem .
If the IPC is see same temp the engine computer is an the gauge isn't working something is wrong with the gauge itself. New instrument cluster would be needed .

Door ajar switch problem more then likely or wiring issue . The BCM - body control module won't turn off interior light , let door lock because it think's the door is open . The door ajar switch is a input to the BCM .

The first thing would be to have it checked for DTC'S - diagnostic trouble codes . Also check with an enhanced scan tool to see if the BCM shows ajar switch data (open or closed ? Do you know about body electronics ?
Body Control Module
The various BCM input and output circuits are described in the corresponding functional areas indicated on the BCM electrical schematics. The Body Control Module functions include the following:
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A/C compressor request. Refer to Air Temperature Description and Operation

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Remote Function Control. Refer to Keyless Entry System Description and Operation

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A/C cooling Fan. Refer to Air Delivery Description and Operation

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Audio Delay Power. Refer to Radio/Audio System Description and Operation

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Exterior and interior lighting control. Refer to Exterior Lighting Systems Description and Operation

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Daytime running lights (DRL)

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Automatic lighting control

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Fog lamps

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Interior lighting. Refer to Interior Lighting Systems Description and Operation

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Battery rundown protection (Inadvertent Power). Refer to Interior Lighting Systems Description and Operation

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Chimes. Refer to Audible Warnings Description and Operation

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Key-In-Ignition

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Head Lamps On

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Seat Belt Not Fastened

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Turn Signal On

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Park Brake Warning

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Door Ajar Warning

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Check gages

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Gage control. Refer to Instrument Cluster Description and Operation in Instrument Panel, Gages, and Console.

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Instrument cluster indicator control. Refer to Instrument Cluster Description and Operation in Instrument Panel, Gages, and Console.

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Theft deterrent. Refer to Theft Systems Description and Operation .

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Engine coolant level sensing. Refer to Cooling System Description and Operation .

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Washer solvent level sensing. Refer to Wiper/Washer System Description and Operation in Wipers/Washer Systems.

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Key-in-ignition sensing. Refer to Audible Warnings Description and Operation in Instrument Panel, Gages, and Console.

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Seat belt use sensing. Refer to Seat Belt System Description and Operation .

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Brake fluid level sensing.

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Parking brake state sensing.

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Rear compartment interface. Refer to Power Door Locks Description and Operation

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Horn interface.

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Door lock interface. Refer to Power Door Locks Description and Operation

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Bulb Check. Refer to Instrument Cluster Description and Operation in Instrument Panel, Gages, and Console.

The temperature gauge sensor as you call is for more then just the temperature gauge . The temp. sensor is an input to the PCM -engine computer ! If it were bad you would have drivability problems , the transmission would not shift correctly an the check engine light would more then likely be lit .
Engine Coolant Temperature Gage
The IPC displays the engine coolant temperature as determined by the PCM. The body control module (BCM) receives a class 2 message from the PCM indicating the engine coolant temperature. The BCM converts the engine coolant temperature into a percent gage deflection. The IPC receives a message from the BCM via the serial peripheral interface (SPI) indicating the requested gage position. The engine coolant temperature gage defaults to 38?°C (100?°F) or below if:
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The PCM detects a malfunction in the engine coolant temperature sensor circuit.

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The BCM detects a loss of class 2 communications with the PCM.

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The IPC detects a loss of SPI communications with the BCM.

Your gauge is more suspect then the sensor . gm had a problem with stepper motors that control the pointer for the gauge !

Bad sending unit in fuel tank, or temp. gauge stepper motor bad

If coolant passages in lower intake manifold and there is a gasket problem, air might get into the system and air in cooling system can cause issues with temp gage. Just my opinion.
I can't see your vehicle, so I can't comment on the problem. I'm just saying how it possibly could effect your temp gage.

Well the outside temperature gauge is generally not wired into the a/c. The internal temperature is more important but is not displayed as such. The 'internal' temperature sensor is used to regulate the a/c blending door and blower speed.

When did the cooling problem start?

u will need to replace the fuel gauge sending unit.

so hard wire a kill switch