If its anything like my 2000 tahoe-the washer reservoir is located,in the fender in front of the driver side wheel well. You must take off the plastic wheel well liner to access the reservoir-held on by 5 or 6 plastic plugs. I think there's one bolt that holds the bottle on near the bottom and then you go up top under the hood and remove an upper bolt. Remove the bottle from beneath and replacing it is the reverse but you must put the bottom bolt in first to hold it in place before going to the top and installing the top bolt.
The other one is for the rear window washer.
If the 2003 model is similar to eariler models, the washer fluid comes from the reservoir under the hood and is the same supply for the front washers. Hard to believe but a small hose runs all the the way from the front of the vehicle to the rear window on my 96 Tahoe.
Firstly, check your owners manual for the exact location of the windshield washer container. Add the recommened type of wahser.
About 3/4 of a gal.
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You have to take the battery out and remove bolts at the top of the reservoir. Then you have to remove the plastic pins inside the front left wheel well to allow you access to the bottom of the reservoir. There are bolts on the bottom to remove as well. You have to remove the hoses from the washer pumps and the reservoir should slide out thru the wheel well.
Attached to the lower part of the fluid tank.
it feeds off the main washertank,
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on these ones it is easier to take off the driver front tire and take out the inner fender wheel well , u can see everything from there,,hope this helps out
You need to wash it.