Why does my GMC climate control keep going cold?

If the line warms up and then goes cold again it indicates that there is not enough Freon in the system. This could be caused by a leak in one or more of the a/c components and an a/c leak machine will be required to locate the leak. If the line stays cold, it could mean a defective actuator on the heater box.

Why is my GMC Sierra air conditioner not working?

Lack of Refrigerant – Your Sierra’s air conditioner will not work if the refrigerant has disappeared due to a leak. In fact, most won’t even cycle on without the right amount of refrigerant pressure. This is far and away the most common reason that your Sierra’s air conditioner is not functioning.

Are there any recalls on GMC climate control?

GMC has issued a recall for fans that will not shut off. This is the reference: The dealer should be contacted for free repair. Another reason for this to happen is a defective blower resistor. It is located next to the blower under the right side of the dashboard.

When was the GMC C / K HVAC unit last used?

This Heater AC Control Unit was used on the 1996-98 line of Chevrolet and GMC C/K Pickups, and on 1996-99 GM Suburbans, Tahoes, and Yukons. It was no longer used after 1999, due partly to unreliability, and partly due to upgrades to newer technology.

Why is my air conditioning not working on my GMC Sierra?

While there are a variety of reasons your GMC Sierra 1500 air conditioning won’t work, the most common 3 are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor.

Why do I have problems with my GMC climate control?

This could be caused by a leak in one or more of the a/c components and an a/c leak machine will be required to locate the leak. If the line stays cold, it could mean a defective actuator on the heater box. The actuator controls the heating and cooling operations and a defective one could cause the problem being faced.

Why does my GMC A / C heater jump from hot to cold?

This is an electrical component in the GMC climate control system that controls the hot/cold functions of the heater and the a/c heater box. If it loses its internal setting it can jump from hot to cold on its own or even go to heating when cooling is set. If this is the cause the actuator will need to be replaced.