Sometimes, it’s impossible to know the full history of a car. With a mixture of dodgy receipts, lacking service histories and questionable repair work, acquiring an accurate diagnosis of your car’s condition is difficult.

When it comes to flood damage, drivers have a couple of options: scrap the car or pay a professional to fix it. But, what if there’s a third option?

Fixing a flooded car is complicated, but not impossible. Keep reading to find out how you can diagnose and fix a flood-damaged car.

Car flood damage symptoms

Thankfully, there are a few clear indicators of flood damage within cars. Here’s how to spot a flood-damaged car:

Damp carpets

An excess of humidity inside a car results in more moisture penetrating trim pieces like carpets and mats. If your carpet is inexplicably damp or wet, it could be a sign of flood damage.

Not only are damp carpets uncomfortable, but they also have a distinct musty smell that will instantly tell you whether or not the car has been flooded.


While rust is found on almost every single car, flood-damaged cars will have a higher amount of it due to the increased amount of water exposure. If a car has more rust than usual, it is likely flood-damaged.

Faulty electrics

Many electrical faults within a car can be attributed to a loose connection that has happened over thousands of miles. However, in flooded cars, the pins within electrical connections become corroded and thus lose their conductivity.

If your car’s lights or infotainment system is failing, it could be a sign of water damage.

Clogged fans

Your car is full of crevices and hard to reach areas, the majority of which are found within your climate control system. Turning on your car’s interior fans is another way of checking for water damage. If water comes out of the vents or your windows start steaming up, there might be water trapped within your car’s dashboard.

How to fix a flooded car

After identifying flood damage, it’s time to get it fixed. While some faults are complicated, there are some minor repairs that you can do at home to get your car ready for the road.

How to fix interior damp

By far the easiest flood-damage repair that you can do is to address the humidity that has been left within your car’s interior.

  1. Open your windows: This will allow fresh air to circulate your car and help remove smells.
  2. Remove seats: Removing your car seats can allow them to air out. It will also provide easier access to carpets and those hard-to-reach areas.
  3. Dehumidify: Dehumidifiers can exponentially speed up this repair. Place one inside your car and let it run overnight to soak up any residual water left inside.

How to fix a flooded engine

Some engine faults can only be fixed by professional mechanics. However, there are a few simple things you can do to diagnose engine failure that has been caused by flooding.

Disclaimer: Do NOT attempt to repair a car that has been flooded in saltwater. Saltwater causes irreversible damage and therefore cannot be repaired.

  1. Check the oil: Using your dipstick, check how much oil is left in your car. If the oil is low or watered down, it will need to be changed.
  2. Open the fuel cap: While fuel caps do a great job of locking in petrol and diesel, when they become fully immersed in water, this water will find its way into your fuel tank. To check for this, open your fuel cap and try to see if there’s a pool of water inside the cap. If there is, your fuel tank will need to be drained.
  3. Remove and replace spark plugs: After a flood, engines will very often become clogged with water, preventing them from starting up. To clear out any residual water left inside your engine, remove your spark plugs and turn on the ignition. You will see that your car does not turn over and that water will spit out of the engine.
  4. Replace filters: After flood damage, your pollen, oil and fuel filters will need to be replaced. To do this, consult your car’s service manual to find their location and part numbers.

How much does it cost to fix a flooded engine?

Ultimately, the cost of fixing a flooded engine will depend on your vehicle, its manufacturing year, and the extent of damage it has undergone. For this reason, it is incredibly difficult to provide an average price for a repair.

As a rule of thumb, cars that have experienced interior damage because of a flood are often too expensive to repair and should, therefore, be scrapped. However, minor flood damage could be as simple as draining the engine and replacing filters; at this point, owners can expect to pay upwards of £500 for repairs.

Buy a safe used car from

Buying a used car can sometimes feel like a gamble. However, you can take the risk out of buying a used car with and knowing how to find a car’s history.

We have thousands of used cars listed by reliable dealers across the UK. Browse today and discover a great deal on your next car.

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