SOURCE: I have a 2005 GMC Sierra 1500 with 100,000 miles
On most GMC Models and CHevy for that matter. There is a hole towards the bottom but still on the side of the radiator. I had to run a small hose from that port to a container on the ground. I did this for a few times and it really helps keep your garage floor clean and clear. I also found it to be a bit of a nuissance to flush the radiator.
SOURCE: 2005 GMC Sierra 1500 emmisons light came on and
There are many reasons that could cause this. Take the vehicle to advance auto or autozone and have the codes read. This will provide the necessary info to find a fix.
SOURCE: can't find relay for radiator cooling fan on 2005 GMC sierra
Go to Autozone.com and sign up and register your truck for FREE. Then you can scroll down to the Diagrams section which also has Fusebox and Powerbox layouts.
The Relays are usually in the Powerboxes under the hood. Sometimes the horn relay is identical to other important relays like your cooling fan relay.
If the layout shows this is true and the part numbers on the case of the part matches, then you can switch the relays and see if the fan works or the horn works.
The diagrams are also for the chassis and will help you trace the wires by color and will indicate through the wiring pattern of whether the relay is in the Powerbox or next to the fan.
SOURCE: check engine light 2005 gmc sierra 1500
try disconnecting your battery undr your hood..then reconnect.
SOURCE: 2005 gmc sierra radiator fan staying on
check the repays that run the fans or the coolant temp sensor
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