Save Carhartt206 · #4 · Sep 18, 2021. GMTRK said: I have an 05 silverado 1500 5.3 I need the entire relay box for the cooling fans. It's a separate relay box next to the big one under the hood. I need to replace it but cant find the part anywhere. Thisis a short video on how to locate, remove and test the radiator cooling fan switch on your vehicle. The cooling fan switch simply activates the cooling fans to turn on, typically TheHIGH speed circuit bypasses the actual resistor, sending the full 12v to the fan for high speed. The ceramic resistor has three terminals (high/low/ground) on the input side and two wires (positive/ground) on the fan side. Relays may be tested in any normal fashion you are familiar with. 323Answers. SOURCE: LOCATION FAN RELAY. The relay is under the right front headlamp assembly and bracket. You can access it two ways. Remove the front bumper facia, headlights, and bracket assembly. The grill is part of the facia and the headlight bracket runs all the way across the front. Or you can remove the right headlamp and use a hole .

where is the radiator cooling fan relay located