After the Flood: What to Check on Your Car After Houston High Water

Houston floods. It is not a question of if but when. If your car was exposed to high water — even if it seems fine now — there are things you should check. Water damage can be hidden and may not show symptoms for days or weeks.

If your car was submerged above the floorboards:

This is potentially serious. Water in the interior can damage: - Electronic modules under the seats, center console, and dashboard - Wiring connectors and fuse boxes at floor level - Carpet padding that holds moisture and breeds mold - Seat rail motors and occupant sensors

If water reached the dashboard level, the car may be a total loss from an insurance perspective. Hidden electrical damage is extensive and unpredictable.

If water entered the engine:

Hydrolocked engine — if the engine was running when water entered the air intake, the water (which does not compress like air) can bend connecting rods, crack pistons, or break the crankshaft. Do NOT try to start a car that may have ingested water. Have it towed and inspected first.

Water in the oil — check the dipstick. If the oil looks milky or has water droplets, do not start the engine. The oil needs to be drained and replaced before the engine runs.

Water in the intake and air filter — pull the air filter and inspect. If it is soaked, replace it and check the intake tract for standing water before starting.

If you drove through high water but made it through:

Brake check — water on brake rotors temporarily reduces braking effectiveness. Lightly apply brakes while driving slowly to dry them off. If you hear grinding or scraping afterward, the rotors may have collected debris.

Electrical inspection — check for warning lights, erratic gauge behavior, or systems that stopped working. Water in connectors can cause intermittent issues that appear days later as corrosion develops.

Undercarriage inspection — mud, debris, and standing water in body cavities promote rust. A good undercarriage wash after flooding exposure helps.

Exhaust system — water entering the tailpipe is usually not harmful (the exhaust system drains). But if the car stalled in water, check for water in the muffler and catalytic converter.

Transmission — some transmissions have vent tubes that can allow water entry during deep water exposure. Check transmission fluid for discoloration or milky appearance.

What we check in a post-flood mobile inspection:

Engine oil condition, air filter, electrical system scan for fault codes, brake operation, undercarriage visual inspection, and fluid checks. If we find evidence of significant water intrusion, we advise accordingly — including when to file an insurance claim.

If your car went through high water during a Houston storm, do not assume it is fine just because it starts. Schedule a post-flood check for peace of mind.