2004 Chevrolet Trailblazer EXT Service and Repair Manual

This factory service and repair manual for the 2004 Chevrolet Trailblazer EXT has the widest specification list in this range: five engines against a single four-door sport utility body and seven trims. They run from a pair of turbocharged twin-cam inline-threes, 1.2L and 1.3L, to the naturally aspirated 4.2L inline-six and the 5.3L and 6.0L overhead-valve V8s. With that much variety, the first step in any engine procedure is identification, and the specifications are indexed so the right set is easy to reach.

Engines covered

• 1.2L inline-three (73 cu in) — DOHC, turbocharged, gasoline
• 1.3L inline-three (83 cu in) — DOHC, turbocharged, gasoline
• 6.0L V8 (364 cu in) — OHV, naturally aspirated, gasoline
• 4.2L inline-six (256 cu in) — DOHC, naturally aspirated, gasoline
• 5.3L V8 (325 cu in) — OHV, naturally aspirated, gasoline

Body styles covered

• 4-door sport utility

Trims covered

• Base
• ACTIV
• L
• LS
• LT
• RS
• SS

Known issues on the 2004 Trailblazer EXT. One recall stands on the federal record for this model year, and it is a small part with a real consequence: heat and vibration can work the tail lamp and stop lamp bulb loose in its socket, so it flickers and then stops working, and following drivers lose the signal that the truck is braking or turning. Complaints run much higher at 1,357, with 716 against the electrical system, 145 against the fuel system and 70 against exterior lighting — the wiring diagrams, circuit tests and fuel delivery diagnostics here cover all three.