An overheating engine is often a good indicator of a blown head gasket, however before you go ahead and try Steel Seal it’s a good idea to rule out a few other possible causes first. Below is a checklist of potential causes of overheating to help you to identify the reason for the issue before a head gasket issue can be suspected. If you have any questions about how to check any of the following please contact Steel seal on the number below.

Cooling System Repair — Overheating issues, if present, must be identified and repaired before proceeding with the Steel Seal treatment. Or call technical support at 855-771-1972

Checklist for Diagnosis of Overheating

Things that can cause overheating: The front of the radiator could be blocked, Low Coolant, Radiator Cap, Surge tank cap, clogged radiator, thermostat, water pump, broken fan belt leak in a hose, leak in the radiator, a block catalytic converter, the hose on the surge tank is blocked, the connection for the hose to the surge tank could be block.


Check the front of the radiator either to make sure that it is not blocked or clogged in any way.

Low Coolant

By a large margin, the most common cause for engine overheating is simply a low coolant level

Radiator Pressure Cap

The Radiator Cap or Surge pressure Cap, that’s the cheapest thing to replace. We suggest you replace the Radiator cap or the Surge tank CAP.

Radiator Fan

Check to see if the fan is cycling on and off, it should come on when you start your vehicle. Another way to check it is while your vehicle is running turn on your air conditioner.

Radiator Clogged

Once your vehicle has reached operating temperature, You can feel the top radiator hose, and then feel the bottom radiator hose to see if they are both close to the same temperature. If not the radiator could be clogged. Also check for a leak in the radiator.

Water Pump

Once the vehicle has reached operating temperature. You can feel the top radiator hose, and then feel the bottom radiator hose to see if they are both close to the same temperature. This will tell you whether or not the water pump is working. And also if the thermostat is opening.

Broken fan belt

There are still lots of engines out there which have a fan belt to drive the engine cooling fan, not many.


Check all hoses including your heater hose to see whether or not they are leaking.

Surge Tank Clogged Cooling Return Lines

remove the hoses from the Surge tank and blow into them to see if whether or not you can create bubbling if you can create bubbling then they are clear, also check the connection where the hoses go on to, make sure they are not clogged.

Catalytic Converter (Muffler)

A bad catalytic converter can cause overheating. A muffler shop may check that for you at no cost.