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If you have a durametric cable, you can activate each fan in its low and high speed modes without having to run the engine. If a fan works in high speed and doesn't in low speed, then the problem is most likely the ballast resistor. If the left fan doesn't work in high or low, then it's something else.
If you don't have a durametric, then there is an easy way to test if the ballast resistor is working. Start the car engine and turn on the AC by pressing the 'snowflake' button on the center console. Both left and right fans should be running at low speed.
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