1997 CHEVROLET BLAZER

Typical onset: 80,000-150,000 mi

Symptoms: Coolant loss with no external leaks visible, White smoke from exhaust on cold start, Rough idle or misfire codes, Oil looks milky or coolant smells like exhaust

Fix: Replace lower intake manifold gaskets with updated composite set, new upper plenum gasket, thermostat, and coolant flush. 5-7 hours labor. Often catch bad injector o-rings at the same time.

Estimated cost: $600-1,100

Typical onset: 100,000-180,000 mi

Symptoms: Transmission fluid leaking at radiator connections, Pink fluid in coolant or coolant in transmission (cross-contamination), Harsh 1-2 shift or slipping in 3rd/4th gear, No forward movement, reverse only

Fix: Steel cooler lines rust through where they pass frame rail, or internal radiator separator fails mixing fluids. If caught early, replace lines and external cooler (3 hours). If coolant entered trans, full 4L60E rebuild or replacement required (10-14 hours). Cross-contamination is a transmission death sentence.

Estimated cost: $300-500 for lines; $1,800-3,200 for transmission rebuild

Typical onset: 70,000-120,000 mi

Symptoms: Clunking over bumps from front end, Steering wander or vague on-center feel, Tire wear on inner or outer edges, Front end shimmy at highway speeds

Fix: Upper ball joints fail first (NHTSA recall history on some years). Lowers follow. Replace all four corners at once with quality parts. 4-6 hours labor including alignment. Do NOT cheap out on parts—failures cause loss of steering control.

Estimated cost: $700-1,200

Typical onset: 90,000-150,000 mi

Symptoms: No start, cranks but won't fire, Stalling when hot or under load, Whining noise from rear when key on, Loss of power on acceleration or uphill

Fix: In-tank pump quits, often intermittently at first. Drop tank, replace pump module and strainer. 2-3 hours labor. Common to replace fuel filter at same time (frame-mounted, rusts in place).

Estimated cost: $450-750

Typical onset: 60,000-100,000 mi

Symptoms: Hard starting in damp weather, Misfire codes on multiple cylinders, Rough idle that moves between cylinders, Fuel smell from throttle body or intake plenum

Fix: Cap and rotor crack from engine heat (1 hour job, $80-150). The real problem is the Central Port Injection 'spider' injector under the intake—poppet valves leak or lines crack causing rich/lean conditions. Requires intake removal, 5-7 hours, often done with intake gaskets.

Estimated cost: $150-250 for cap/rotor; $700-1,000 for spider injector replacement

Typical onset: 80,000-140,000 mi

Symptoms: Coolant puddles under vehicle, Overheating in traffic or under load, Coolant level drops steadily, Squealing or grinding from water pump area

Fix: Plastic radiator end tanks crack, water pump weeps from weep hole or bearing fails. Radiator replacement 2-3 hours, water pump 3-4 hours (fan clutch, accessories in the way). Do thermostat and hoses at same time.

Estimated cost: $350-600 for radiator; $400-650 for water pump job

Typical onset: 100,000+ mi

Symptoms: ABS light on constantly, Grinding or buzzing from ABS pump on startup, Soft or spongy brake pedal, Brake fluid leaks at frame rail junctions

Fix: ABS pump motor burns out (3 hours, often requires used unit or reman at $400-800). Steel brake lines rust at frame brackets—common in salt states, requires section replacement or full line runs. Safety critical.

Estimated cost: $600-1,200 for ABS pump; $300-700 for brake line repairs

Symptoms: Blower only works on high speed, No airflow from vents or stuck on defrost, Clicking or grinding from dash when changing modes, Blend door doesn't switch between heat and AC

Fix: Blower resistor under hood (30 min, $40-80). Mode/blend door actuators behind dash fail—requires dash removal for full access (6-8 hours). Many owners live with defrost-only or drill access holes.

Estimated cost: $50-120 for resistor; $500-900 for actuator if doing it right