Testing Antifreeze with a Hydrometer Testing Antifreeze with a Hydrometer

What You'll Need
A cloth
A hydrometer

Testing antifreeze with a hydrometer is a simple and easy job. Be sure that the hydrometer you are using is compatible with the antifreeze you use in your vehicle.

Step 1 – Safety

Be sure to allow your the engine in your vehicle to cool completely, to avoid any accidental burns. Your antifreeze will also need to be at room temperature, in order to attain the best results from the hydrometer.

Step 2 – Filling the Hydrometer

Open the hood of your vehicle. Locate the radiator and remove the cap. Place the cap in a safe place until you need to put it back on. Squeeze the rubber end of the hydrometer and draw in the antifreeze. Be sure the hydrometer is completely full.

Step 3 – Reading the Hydrometer

Check the freeze point scale on the hydrometer. It should read 34 degrees Fahrenheit or below. A higher temperature indicates the cooling system requires flushing. Check the boiling point on the hydrometer. It should read 265 degrees Fahrenheit or higher. A lower boiling point indicates that the cooling system requires flushing.

Step 4 – Completing the Reading Process

Squeeze the antifreeze from the hydrometer back into the radiator. Secure the cap back into position. Close the hood of your vehicle.

Got a New Project You're Proud of?

Post it on Your Projects!