r/MechanicAdvice • u/Bubuchubu305 • 2d ago

I need HELP!!!!

Hey everyone, I have a 2019 Hyundai Tucson 2.0L, and I'm having a weird issue with my AC.
When I leave my apartment in the morning, the AC works perfectly fine and blows cold air. My commute to work is about 25 minutes, and I get on the highway pretty much as soon as I leave home. The AC works fine while I'm driving on the highway, but as soon as I exit and stop at the first traffic light near my job, the AC stops cooling. The same thing happens on my way back home, and sometimes the AC won't even start cooling when I leave work.
I also noticed that my radiator/condenser fan doesn't seem to be working properly on high speed. I tried replacing the high-speed fan relay, but that didn't fix anything.
Could the fan issue be causing the AC problem, or could it be something else like the fan motor, compressor, pressure sensor, or refrigerant issue?
I'd like to diagnose this myself if possible before taking it to a mechanic. What should I check first, and is there a way to test the fan and AC system at home with basic tools?
Has anyone experienced something similar with their Tucson? Any advice would be appreciated. Thanks!

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u/1453_ 2d ago

The fan behind the radiator should always be running when the AC is on. Check it with the engine running and the AC on when you see its not cooling.

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u/Bubuchubu305 2d ago

Fan is always running but not on high speed. Only on slow speed. And my car’s temperature gauge is working fine.

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u/1453_ 2d ago

The next step is to connect it to manifold gauges and check the pressures.

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u/GeriatricSquid 2d ago

I was gonna tell you to check your radiator fans. The engine heat is wiping out the A/C heat exchanger because the fans aren’t moving cooling air across those two heat exchangers that are sitting together. It works until the engine heats up.