Chevy AC Dead? Check Pressure Switch & Control Failure

Had a really similar issue with my 2016 Chevy Spark last summer. As someone with some basic AC repair experience, I first thought it was just low refrigerant, but it turned out more complex. The symptoms matched exactly, no response from the temperature control and completely dead AC. Took it to my regular workshop after my basic diagnostics didn't reveal anything obvious. They found multiple faulty valves in the AC system that were preventing proper pressure regulation. The full repair included: Replacing defective AC valves, System pressure testing, Recharging the refrigerant, Testing the blower motor and AC efficiency Total fix was around 1000 Euro, but it's been working flawlessly since. Before suggesting more specific solutions, could you share: Any unusual sounds when trying to activate the AC? Does the blower motor work on regular ventilation? Have you noticed any wet spots under the car? Any warning lights on the dash?

Thanks for the details. Just had my 139,317 KM service done last month. In my case, there's no odd noise when pressing the AC button, just complete silence. The blower motor doesn't work at all, even on regular vent settings. No warning lights or fluid spots under the car. Yesterday I tried checking the AC relay and fuses, all looked normal. Makes me think it could be either the blower motor itself or maybe an electrical issue with the control module. Since the entire system is unresponsive, I'm guessing it's not a refrigerant leak like your case. Did your mechanic mention anything about testing the control module before jumping into the valve replacement? Getting concerned this might be a costly electrical diagnosis rather than just mechanical AC components.

Yeah, your symptoms are actually quite different from what I experienced with my Chevy Spark. The complete lack of blower function points more toward an electrical issue rather than the valve problems I had. Before my mechanic dove into the AC maintenance work, they did run electrical diagnostics. The AC relay and control module testing is usually step one of proper AC diagnostics, since these parts control the whole system. In my case, the blower was still working, which helped rule out electrical problems. Since your blower won't work even on regular ventilation settings, I'd focus on: The blower motor itself, The blower motor resistor, The control module connections My mechanic mentioned that complete system shutdown often traces back to the control module or a blown blower motor. Much simpler fix than my valve issues if that's the case. The AC noise (or lack thereof) when pressing the button is also a telling sign, in my valve problem case, you could at least hear the system trying to engage. Would recommend having the electrical system checked before investigating any mechanical AC components. Could save you from unnecessary repairs and costs.

Thanks everyone for the input. After hearing about these different scenarios, I'm feeling more confident it's an electrical problem rather than an AC pressure or refrigerant leak issue. The complete silence from the system and non-working blower in all modes really points to something electrical. I'll have my mechanic start with checking the blower motor, resistor, and control module before diving into any cooling system components. The lack of AC noise when pressing buttons does seem like a big clue that we're dealing with electrical rather than mechanical problems. Will try to get it diagnosed this week and update once I know what's actually causing the problem. Hoping it's just the blower motor since that should be a straightforward AC maintenance job compared to dealing with valve replacements or extensive electrical work.