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2004 Chevrolet express 3500 does not have A filter for the cab or a filter on the incoming air that comes in through the area behind the hood in the center of the van. You can see the vent intake or vacuum operated blending door if you look through the plastic screen part of this trim piece with a flashlight it is down and to the left. My Xpress 3500 Cutaway has a trail light motorhome attached I'm assuming that this is also true for the 2500 van. I found this out the hard way this area got filled up with sand and leaves there's a drain at the bottom and it was clogged the blending door or vent door allowed the sand leaves to go directly into the blower motor and then next the heater core this all had to be washed out and the heater core sucked clean with a vacuum since it is nearly impossible to access it through the passenger side of the cab I removed the blower motor, cleaned that and then used a vacuum with an attached piece of PVC pipe three-quarter inch and a 90 on the end and carefully put it through the box where the blower was and into the side where you can see the heater core itself.. the only thing I was able to do from the passenger side was pull the cover down and out exposing the ac coil enough to blow compressed air through it back towards the heater core . If I'm not mistaken after you remove the screws holding this pice on the passenger side below the dashboard , where a glove box would of been there are screws that are not accessible you are directed to cut the top side seam to remove it . This I found from reading the instructions for replacing the
heater core ,I'm hoping to find some sort of filter offered to fix the intake, if not I think a piece of washable filter material cut accordingly and placed in front of the vaccume actuated blending /vent door , the 1" thick green or blue hvac washable material is what I am referring to . You would need to take the windshield wipers off and the plastic piece below that spans most of the area between the back of the hood and the bottom of the windshield you could put a pice ofthe washable filter material here in front of the vent door . As for the interior cabin filter I'm hoping some one makes in
The cabin air filter is located under the cowl. Open the hood, proceed to the passenger side of the car and you will see where the right side wiper is resting, under the black plastic cowl there the cabin filter is.
The air filter for the cabin is located inside the van, look under the glove box door there should be a plastic holder that slides to the rearward of the van pull this back and a flat plastic door will come off, the door is two parts.
Some base vans do not have this filter if you look at the bottom of this and see a 1/2 long plastic stud sticking out of the bottom there is no filter in this.
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