2003 CHEVROLET BLAZER

Typical onset: 80,000-140,000 mi

Symptoms: coolant loss with no visible external leaks, white smoke from exhaust on cold start, rough idle or misfire codes, oil looks milky or contaminated

Fix: Replace lower intake manifold gaskets, often includes upper plenum gaskets and thermostat while in there. 5-7 hours labor. Dex-Cool coolant interacts poorly with gasket material causing deterioration.

Estimated cost: $800-1,400

Typical onset: 90,000-150,000 mi

Symptoms: pink or red fluid dripping near radiator, transmission slipping or delayed engagement, transmission overheating, coolant in transmission (strawberry milkshake fluid)

Fix: The internal transmission cooler in the radiator fails, allowing coolant and ATF to mix, destroying the 4L60E transmission. Requires radiator replacement plus external cooler installation. If contamination occurred, transmission rebuild is mandatory. Radiator alone: 3-4 hours. Trans rebuild adds 12-16 hours.

Estimated cost: $400-800 (radiator only), $2,500-4,200 (with transmission rebuild)

Typical onset: 120,000-180,000 mi

Symptoms: harsh 1-2 shift or slipping between gears, no 3rd or 4th gear, delayed engagement into drive or reverse, burnt transmission fluid smell

Fix: The 4L60E is notorious for worn 3-4 clutch packs, sun shell failures, and valve body issues. Rebuild or replacement required. 10-14 hours labor for R&R and rebuild.

Estimated cost: $1,800-3,200

Typical onset: 150,000-220,000 mi

Symptoms: blue smoke on acceleration, excessive oil consumption (quart every 500-1,000 miles), fouled spark plugs, loss of compression

Fix: Ring wear leads to blowby and oil burning. Requires engine rebuild with new pistons, rings, bearings, and often cylinder honing. Some engines need full short block. 18-24 hours labor for complete teardown and rebuild.

Estimated cost: $3,500-6,000

Typical onset: 100,000-160,000 mi

Symptoms: engine cranks but won't start, stalling after warmup, sputtering under load, whining noise from fuel tank

Fix: In-tank pump fails, requires dropping the fuel tank. 2-3 hours labor. Replace fuel filter at same time if accessible.

Estimated cost: $500-850

Typical onset: 80,000-140,000 mi

Symptoms: gear oil drips under front axle or transfer case, whining noise during turns (4WD), difficulty shifting into 4WD

Fix: Pinion seals, axle seals, or transfer case output seals leak. Individual seal replacement: 1-2 hours per location. May need U-joint or bearing work if caught late.

Estimated cost: $250-600 per seal job

Typical onset: 70,000-120,000 mi

Symptoms: clunking over bumps, wandering steering, uneven tire wear on inside edges, play in wheel when jacked up

Fix: Upper and lower ball joints wear, especially with larger tires or towing. Replacement requires pressing out old joints, sometimes control arm replacement if pressed-in style. 4-6 hours for both sides.

Estimated cost: $600-1,200

Symptoms: check engine light with P0440, P0442, P0446 codes, fuel smell near rear axle, difficulty filling gas tank (clicks off repeatedly)

Fix: EVAP system components fail, usually vent solenoid or canister purge valve. Diagnosis requires smoke test. Parts are cheap, labor is 1-2 hours depending on location.

Estimated cost: $150-400