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The Discovery 4 (called the LR4 in North America) is an updated version of the Discovery 3.

Why the air compressor not starting?

Why air compressor not starting

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@innocentmutepfa have you checked your fuses? What have you checked and tried already?

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@innocentmutepfa start by checking fuse #28E which controls the compressor clutch relay. If your fuse is good, you will need to check the relay. Here is the Land Rover Discovery 4 HVAC Wiring diagram. Use that to check your compressors power lines.

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