2019 Tahoe B0413

BigMountains · May 24, 2026

Hello, I have a 2019 Tahoe that only throws warm air. The compressor has been replaced, but the problem did not change. Revving the engine does not change anything. I have noticed that the cooling fans run in low speeds for a few seconds and then they turn off. The only time the A/C is cool is when I use a scanner.

Reading the codes, the only code I got was a B0413 - Main Temperature Actuator Circuit Fault. I have already changed the actuator and tried calibrating it, but the code still appears and the status of the new actuator says it failed the calibration.

Any ideas would be very helpful.

LsHart · May 24, 2026

Where did u get the part from? U can power probe the ac relay and command the compressor on and see if it cools. Possibly the high pressure sensor is bad? Or not enough freon

BigMountains · May 25, 2026

I don't know where the compressor was from, but it was changed. The high pressure sensor was giving me around 1.6 volts and around 165 psi.

BigMountains · May 26, 2026

I replaced the compressor and the high pressure sensor and the truck is cooling now, but out of nowhere, it gets hot for a second a then it cools down again.

One thing I forgot to mention is that the code, B0413 still shows up, but when with the old blend door actuator, the code was B0413-05. With the new one, it is B0413-61.

2019 Tahoe B0413

BigMountains

TYF Newbie

LsHart

Senior Member

BigMountains

TYF Newbie

BigMountains

TYF Newbie

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