The Repair-or-Sell Calculation, Done Properly
The question is not “does the repair cost less than the car is worth.” It's:
Repair cost + probable next failure within a year versus what the car brings as-is + the real cost of replacing it.
A worked example. A 2013 Equinox with 265,000 km needs a transmission. The quote is $3,600. As a non-running vehicle it's worth a few hundred dollars. Fixing it means putting $3,600 into a twelve-year-old vehicle that still has the original struts, a rusting rear subframe, an aging timing chain and brake lines that have seen twelve Alberta winters. The transmission will be new. Nothing else will be.
Against that: a comparable running vehicle at a similar age costs somewhere in the same range as the repair, and starts its life with you having none of the deferred maintenance.
Sell when: the vehicle is over ten years old, the repair exceeds roughly a third of its working value, there's structural rust, or two or more major systems have failed.
Repair when: the vehicle is newer, has documented maintenance, the failure is a single discrete component, and the body and frame are solid.
Call us with the details either way. If your car is worth fixing, we'll say so.