B3933

Air Conditioning Evaporator Temperature Sensor Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–89 (est.)

Symptoms

Incorrect operation of the air conditioner
The air conditioner turns off spontaneously
Insufficient interior cooling
Fogging of glasses due to high humidity

Causes

Open or short circuit in the sensor wiring harness
Evaporator temperature sensor malfunction
Poor contact in the sensor connector
Problems with the climate control unit

How to Fix

Check the integrity of the sensor wiring harness
Check sensor resistance (usually should be between 1-10 kOhm depending on temperature)
Inspect the sensor connector for corrosion or damage.
If necessary, replace the evaporator temperature sensor
Reset the error and check the system operation

Related codes

B3934 B3935 B3936