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Testing a radiator fan switch acura tl?

Updated: 10/20/2022
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1. Locate and unplug the radiator fan switch A. This is in the area under the air passage the leads between the air filter and the upper intake manifold. It is located next to the right-most coolant passage (look for the two large radiator hoses, it's the lower hose.) The connector is round and gray and has one black wire and one green wire leading into it.

2. Turn the car to the on (II) position.

3. Use a multimeter to measure the voltage between the connector for the green wire and any unpainted bolt that is clearly attached to the body of the car (like the bolt head of the right 3 suspension tower connectors).

Is there battery voltage? (approx 10-12 volts)

Yes- go to step 5

No- repair open in the wire between the radiator fan switch A and the under-hood fuse/relay box (black box near passenger windshield).

5. Turn the ignition off and use the multimeter to check for continuity between the black wire of the radiator fan switch A and body ground.

Is there continuity?

Yes- replace radiator fan switch A

No- check for an open in the wire between the radiator fan switch A and the body ground

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