Body control module on chevy express 3500 - 2008 Chevrolet Express

SOURCE: Body Control Module

Below the instrument panel on the left side henge pillar,or up high behind the Instrument panel depending the model and options!

SOURCE: Body Control Module - 2000 Chevy Blazer

Not sure about a body control module, there is a pcm under the hood on the pass. side that controls most everything on these, however i would check your fuses for the seat, on the 00 models the headlights do stay on all the time while driving due to daytime running lights but if they stay on after you take the key out then id check the headlight switch or sensor on the pass side dash.

SOURCE: 1999 Chevy express 454 belt diagram.

454 with ac and a.i.r.

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SOURCE: 2004 chevy 3500 express passenger van transmission

The van should already have a tranny cooler. You can get a bigger cooler and it is a fairly easy job to change.

SOURCE: Where is the body control module on my 2006 chevy

BCM MODULE-UNDER REAR LEFT SEAT