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✓FITMENT FOR CHEVY SONIC:For Chevrolet Sonic 2012-2019 1.4L I4 Turbo Gas; Sonic 2013-2017 1.6L I4 Gas; Sonic 2012-2018 1.8L I4 Gas or Flex Fuel. The supplied records cover LS, LT, LTZ, RS and Premier sedan or hatchback configurations, but engine and trim availability varies by year. Verify the exact year, engine, trim and body style before ordering.
✓REPLACEMENT REFERENCES:Cross-references 95048411, 42609220, GM3014167, 603-386 and 603386. Confirm the replacement number together with the original reservoir’s shape, two-hose-port layout, cap neck and mounting points because a matching Sonic model name alone does not verify the complete configuration.
✓PRESSURIZED 1.2 L CONFIGURATION:The included cap has a supplied pressure specification of 140 ±15 kPa, nominally about 20 PSI. The 1.2 L capacity is measured at the MAX fill level rather than the brim, preserving the intended coolant expansion space. Transparent PP construction is rated from -30°C to 120°C and allows coolant-level inspection without removing the pressurized cap. This configuration has no coolant-level sensor function.
✓WHEN REPLACEMENT MAY BE NEEDED:Cracks, seam or hose-port seepage, dried coolant residue, coolant odor, repeated coolant top-offs or an inconsistent reservoir level may indicate deterioration of the original tank, cap or connections. Replacing the affected reservoir provides the correct container and connection layout; continued coolant loss or elevated engine temperature requires complete cooling-system diagnosis.
✓BUILT AROUND PRESSURE AND SEALING:BDFHYK treats the reservoir as part of a pressurized cooling circuit rather than simply a plastic bottle. Cap rating, cap-neck sealing, hose seating, mounting alignment, correct coolant level and proper bleeding all affect operation. Allow the engine to cool completely before opening the cap, then inspect both hose connections and surrounding components after installation.