Truck A/C Issue

Someone had similar problems last week.

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This is a common problem on Chevy's trucks.

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This Youtube video should answer your questions https://www.youtube.com/watch?v=fuGVAE3YWlg

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I have a 2006 Silverado, was having this same problem. I tried your solution & it work just fine. I'm still interested in finding out what causes this problem. Do you have any suggestions?

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I changed my actuator also and it didnt help. $150 wasted. Before you do anything, pull your fuses and let it sit! This happens when you have a voltage drop such as a bad battery or loose or dirty conections. Pull the fuses and let it "Reboot" so to speak. Dont waste your money like I did.

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press the ac button and it blinks 3 times.

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This does not sound like the blend door. If the light is blinking means the compressor, in fact, is not coming on. The previous post about compressor clutch gap has merit but also freon pressure sensors, especially with high ambient temps.

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With how hot it is right now it's pretty common for them to start tripping out on low suction.

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actually,the exact opposite would be true. High temps plus high humidity = high suction side pressures.

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Check for a bad relay switch. Had this happen to mine. Cheap to buy and easy to swap.

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Check where for a bad relay switch?

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Before you do anything, pull your fuses and let it sit! This happens when you have a voltage drop such as a bad battery or loose or dirty conections. Pull the fuses and let it "Reboot" so to speak. Dont waste your money like I did.

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I'll try this.

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This does not sound like the blend door. If the light is blinking means the compressor, in fact, is not coming on The previous post about compressor clutch gap has merit but also freon pressure sensors, especially with high ambient temps.

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Thanks

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It's probably low on freon.

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Freon level checked ok.

Thanks to all for the replies.

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Check where for a bad relay switch?

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More than likely in the fuse/relay box under the hood. Get your diagram out and find the one labeled something like AC Relay, Compressor Relay, AC clutch relay, etc. etc. That relay has probably gone bad.

In general, an AC stops working because the pressure is too high, too low, compressor is shot, or a switch (relay) has gone bad.

It seems like you've ruled out a bad compressor. You haven't mentioned hooking up any pressure gauges but you did say your freon level was OK so I'm kinda ruling that one out as well.

The remaining culprit is usually in the electrical somewhere. If you're skilled in this area, you can "jump" the low pressure switches and directly run 12 v to the compressor clutch to see if it engages.

I've seen the opposite. When the compressor kicks on there isn't enough freon in the system to hold pressure through the loop and it clutches out on low suction pressure to save the compressor from damage.

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if the freon is low, that means there is a leak. That would be the source of not being able to hold pressure.

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thank you. If downshift would read OP said it had the right amount of freon

nothing firm here, but this link gives some ideas...looks like there can be a number of causes...

Chevy Forum

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I found a hunk of wire sticking out of the ac relay connection, obviously someone was trying to jump it for some reason

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so,the wire was stuffed under the relay? If so then it was definitely done on purpose. If not under the relay then it could have been a simple forgetful mistake TBH.

I would jump out relays all the time during the diagnostic procedure.The low pressure switch activates and deactivated the compressor clutch relay and they do go bad. I always use a multimeter with a bed of nails connector to test out switches and such tho.