I replaced the radiator, all hoses, and the overflow kit, temperature sensor and plug relays. I'm at my wits in?
Aug 4, 2023 at 6:14 PM
The cooling fans only turn on when the temperature sensor is unplugged?
2005 CHEVROLET SILVERADO
SLIM71US61
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Verify all information, follow manufacturer service procedures, use proper tools and safety equipment,
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Hi,
First, make sure there is power to fuses (three of them) in the under-hood cooling fan relay box.
Next, you indicated the replacement of the relays. For them to actuate and turn a fan motor on, the PCM needs to provide a ground path to complete the primary side of the relay.
I attached the wiring schematic below. See if the wires I indicated have continuity to ground when the fans should be on.
Also, take a look through this link for a better description of the relay operation:
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
Let me know.
Take care,
joe
See pics below.
First, make sure there is power to fuses (three of them) in the under-hood cooling fan relay box.
Next, you indicated the replacement of the relays. For them to actuate and turn a fan motor on, the PCM needs to provide a ground path to complete the primary side of the relay.
I attached the wiring schematic below. See if the wires I indicated have continuity to ground when the fans should be on.
Also, take a look through this link for a better description of the relay operation:
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
Let me know.
Take care,
joe
See pics below.
Images (Click to enlarge)
Aug 4, 2023 at 10:34 PM
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