Blown head gasket: fix it or sell the car?

Before you decide, rule out a cheaper leak, check whether the maker covers your engine, and stop driving it.

What the repair can cost

AAA estimates that a blown head gasket or a cracked engine block can cost more than $1,000 to repair (AAA). That figure is a floor, not a ceiling.

Not every overheat means a gasket, though. AAA lists a blown head gasket as one of several common causes of an engine running hot (AAA). A simple coolant leak repair runs a few hundred dollars, and a new water pump or thermostat runs $300 to $700 (AAA). Get the cause named before you price the fix.

Set the quote beside what the car is worth today, with the fault. If the repair eats most of that value, our guide to repairs that outweigh the car walks through the math.

Signs the gasket is the problem

AAA and the bulletins filed with NHTSA point to a short list of clues:

• A sweet smell. AAA says burning coolant smells sweet (AAA).
• Coolant under the car. The cooling system is sealed, AAA notes, so any coolant on the ground means a leak somewhere.
• Steam from the engine. Coolant leaking onto hot engine parts while the engine runs turns to steam, per AAA.
• White exhaust smoke and a falling coolant level. A Ford bulletin for the 2.0L EcoBoost describes those two together as symptoms of coolant entering the cylinders (Ford bulletin).
• Running hot with coolant loss. A Suzuki bulletin says a cracked block may show up as coolant loss, the engine running hot, or a burning-coolant smell (Suzuki bulletin).

None of these proves a blown gasket on its own. A shop test does.

Don't top it up and keep going

This is the mistake that turns a gasket job into a dead engine. AAA warns that adding coolant yourself and continuing to drive is dangerous and can cause thousands of dollars of damage. When the car overheats, AAA's advice is to call for a tow to a repair shop (AAA).

Small leaks grow, too. AAA says ignoring a coolant leak can lead to overheating, which can crack the block or blow the head gasket (AAA). If yours has already gone that far, see blown engine.

Why gaskets fail

Three causes show up in the sources:

1. Age. AAA says a head gasket can leak or crack from normal wear and tear over time (AAA).
2. Design. A 2023 manufacturer bulletin, 15-23-01 "Head Gasket Leakage," says the original production gasket design can lead to coolant leaks, and that the maker improved the gasket's design and coating starting at a set engine number in July 2023 (bulletin 15-23-01).
3. Casting stress. Suzuki says residual stress from casting can crack the block at the bottom of the head bolt threads on certain 2009-2010 Grand Vitara and 2010 Kizashi engines (Suzuki bulletin).

Heat and cold play a part as well. AAA says extreme temperatures leave an engine open to damage and cracks, and that coolant lowers the cooling system's freezing point in winter (AAA). It also advises checking the owner's manual for the right coolant type.

Check whether the maker pays first

A design or casting fault can mean the repair is covered, so call a dealer with your VIN before you spend anything.

• Suzuki extended cylinder block coverage on the affected Grand Vitara and Kizashi engines to 20 years with unlimited mileage from the in-service date. One catch: cooling system diagnosis is customer pay until a block crack is confirmed (Suzuki bulletin).
• Bulletin 15-23-01 covers only head gasket replacement for the leak it describes. Other coolant leaks on the same car are not covered by it (bulletin 15-23-01).

Our maker warranty extensions page collects other programs worth checking.

Fix it or sell it

Repair it when:

• the maker covers it, or
• a shop has confirmed the cause, the quote is well under the car's value, and nothing else major is wrong.

Sell it as is when:

• the quote nears or tops the car's current value
• the engine kept running hot after the first warning signs
• a block crack is suspected and no coverage applies
• you'd need a tow just to get it diagnosed

A car with a bad gasket still has a whole body, interior and drivetrain. That has value even when the engine needs work. See what a junk car is worth for how offers are set.

What you sign when you sell, state by state

The title work is the same for a car with a dead gasket as for a healthy one. Here is the seller's main step in each state's official guidance.

Every row's source appears in the list below.

Pennsylvania's rule is the one most worth reading in full, because it changes with the buyer. The statute has the owner's assignment "sworn to before a notary public or other officer empowered to administer oaths," but a title assigned to a vehicle salvage dealer or a scrap metal processor is exempt from notarization (75 Pa.C.S. 1111).

Two more details catch sellers out. Montana voids a title carrying white-out or scratched-over entries (Montana MVD). In Mississippi, a seller who leaves the buyer line empty, planning to complete it afterward, violates state law (Mississippi DOR).

Selling the overheating car to us

We buy whole non-running and junk cars, so you can sell the whole car as it sits. There's no need to fix the gasket, flush the coolant or get it running first. Send these details with your offer request:

• the year, make, model and mileage
• what's wrong: overheating, coolant loss, white smoke, or a shop's diagnosis
• whether it still starts and drives
• whether the title is in your name

Pickup is free anywhere in the US, and that includes a car that can't be driven to the tow.

Prefer to talk it through? Call (877) 421-6008.

Once it's gone, finish the plates and your state's sale notice. After you sell has each state's rule.