Cars simply last here
It is worth stating plainly, because it changes what is worth buying. San Diego has no freeze-thaw cycle, no road salt, no extreme heat and no severe weather. The three mechanisms that end vehicles across most of the country do not operate.
A twenty-year-old car here can have a completely sound underside, fasteners that undo, and brake lines with usable threads. Repair estimates that assume a fight do not apply, and the calculation that says "buy the complete assembly because removal is the expensive half" — which is correct in Michigan — is usually wrong here. The component is often the right purchase.
That also means vehicles reach mileages where things wear out rather than corrode away: bearings, joints, bushings and drivetrain reach genuine end of life rather than being replaced because they seized.
The marine layer
What does corrode is coastal. Salt-laden air reaches well inland from the ocean, and it works from the outside in rather than from underneath.
- Brake hardware. Caliper slides, pins, clips and pad abutments — parts that must move freely and stop doing so.
- Aluminium against steel. Galvanic corrosion with salt as the electrolyte is what seizes a wheel to a hub.
- Electrical connectors and grounds, particularly low on the vehicle.
Anti-seize on the hub face and on wheel fastener threads at every brake job is two minutes that saves an hour, and near the coast it is worth more than most maintenance.
Idling at the border
San Ysidro is one of the busiest land crossings in the world, and the wait is measured in hours rather than minutes for a great many people here.
Extended idling is a specific load. The engine is running with essentially no airflow through the radiator or the condenser, the air conditioning is working against solar gain through the glass, and the alternator is supplying the full electrical load at the lowest speed it will ever turn.
What that finds: a marginal cooling fan, a tired alternator, a condenser with damaged fins, and an air conditioning system that is adequate at speed and inadequate standing still. A system that is cold on the freeway and warm in the queue is a condenser or a fan rather than a refrigerant charge.
Mild does not mean nothing
Two things still age a car here. Ultraviolet, which hazes headlight lenses until they scatter the beam and hardens rubber bushings until they crack rather than wear. And time, which degrades brake fluid regardless of mileage — it absorbs water from the atmosphere and boils lower every year whether the car is driven or not.
On a vehicle that will do twenty years here, time-based maintenance matters more than mileage-based maintenance. Fluid, belts, hoses and rubber all age on a calendar.
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