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Message: <blockquote data-quote="ORVietVet" data-source="post: 24808" data-attributes="member: 9438">I am looking for the Genuine GM or AC Delco part numbers for that control module and the actuator that controls the hot/cold mode. VIN is 1GNEK13T45R142468.Her a/c can be ice cold and while driving will go to warm, without touching temp controls. When I run it, I can change the temp controls and can hear a loud ratcheting noise as the actuator change positions and sounds like is behind the glove box area. I believe the actuator is failed/failing and the control head has problems because the system is full and when it turns warm, the a/c clutch is disengaged and jumping the low pressure cycling switch does not engage the clutch. The ratcheting noise has been going on for quite a while, even though the a/c would blow cold. Now the noise is still there and the signal is not even at the low pressure switch at the accumulator I tried crossing the connections and still no clutch engagement. The other actuator controls for the modes of blowing out of dash, floor, both or defrost, all work for the direction of flow. When those are operated there is no ratcheting noise.</blockquote>