Building a Mechanical Baseline Before Building a Camper

We bought our 2005 Astro from a work fleet. 187,000 km, boxy, honest, and completely unknown history-wise. Before it got a lift or a winch, it got a mechanical baseline — a top-to-bottom refresh so every future problem was a *new* problem, not an inherited one.

The rule

You don't build on a broken foundation. Every hour of overland prep on a van with a marginal cooling system, tired ignition, or a mystery oil leak is an hour you'll re-do in the ditch.

What we did

• Fluids: engine oil + filter, transmission fluid + filter + pan gasket, coolant flush, differential fluid, brake fluid bleed.
• Ignition: cap, rotor, plugs, wires — the 4.3L Vortec is happy with fresh spark and miserable without.
• Cooling: thermostat, radiator cap, upper and lower hoses, water pump inspected (replaced later — Chapter 8).
• Belts and hoses: serpentine, every rubber hose inspected and squeezed.
• Brakes: pads, rotors resurfaced, calipers freed.
• Steering & suspension: every ball joint, tie rod, and idler arm inspected — replaced later during the lift install.

What we didn't do

We didn't chase upgrades yet. This wasn't the time for a colder thermostat or a "performance" cat. The point was to bring a 20-year-old van back to spec so we knew what stock even *felt* like on this platform.

Cost

About CA$1,400 in parts, one long weekend, and a sore back. Every dollar of it made the rest of the build possible.

What's next

With a known-good baseline, we could start diagnosing quirks properly. Which is why the next thing we bought was the single most important tool in the van — an OBD-II scanner.