Hyundai Sonata: Exterior Care / Underbody maintenance

Corrosive materials used for ice and snow removal and dust control may collect on the underbody. If these materials are not removed, accelerated rusting can occur on underbody parts such as the fuel lines, frame, floor pan and exhaust system, even though they have been treated with rust protection.

Thoroughly flush the vehicle underbody and wheel openings with lukewarm or cold water once a month, after off-road driving and at the end of each winter. Pay special attention to these areas because it is difficult to see all the mud and dirt. It will do more harm than good to wet down the road grime without removing it. The lower edges of doors, rocker panels, and frame members have drain holes that should not be allowed to clog with dirt; trapped water in these areas can cause rusting.

WARNING

After washing the vehicle, test the brakes while driving slowly to see if they have been affected by water. If braking performance is impaired, dry the brakes by applying them lightly while maintaining a slow forward speed.

Bright-metal maintenance
To remove road tar and insects, use a tar remover, not a scraper or other sharp object. To protect the surfaces of brightmetal parts from corrosion, apply a coating of wax or chrome preservativ ...

Aluminum wheel maintenance
The aluminum wheels are coated with a clear protective finish. CAUTION Do not use abrasive cleaner, polishing compound, solvent, or wire brushes on aluminum wheels. Clean the wheel when it has co ...

Other information:

Hyundai Sonata LF 2014-2019 Service Manual: Center Facia Upper Panel Repair procedures
Replacement     • Put on gloves to protect your hands.     • When prying with a flat-tip screwdriver or use a prying trim tool, wrap it with protective tape, and apply protective tape around the related parts, to prevent damage. • Us ...

Hyundai Sonata LF 2014-2019 Service Manual: Positive Crankcase Ventilation (PCV) Valve Repair procedures
Removal 1. Disconnect the PCV hose (A). 2. Remove the PCV valve (B). Inspection 1. Insert a thin stick (A) into the PCV valve (B) from the threaded side to check that the plunger moves.     If the plunger does not move (PCV valve is clogged), clean or replace the val ...

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