How To: Test Antifreeze @oreillyautoparts
How To: Test Antifreeze  @oreillyautoparts
Uploaded October 2024 | Updated September 2026, 2 weeks ago
Maintaining the right balance of antifreeze in your vehicle is key to protecting your critical engine components from extreme temperatures, damage, overheating, and corrosion, and also prevents freezing in cold temperatures that could lead to block or cylinder head damage. Also known as coolant, antifreeze regulates engine temperature to prevent overheating as well as limiting the risk of freezing in cold temperatures. Over time, antifreeze can break down or become contaminated or diluted, which could cause boil over, corrosion, or allow freezing to occur inside the engine. Testing antifreeze helps you discern its freezing and boiling points, indicating the overall health of the antifreeze in your system. This can help you make a decision on whether or not your vehicle’s antifreeze is offering enough engine protection, and whether an antifreeze flush and fill or antifreeze ratio correction may be appropriate. Our step-by-step video shows how to test antifreeze in most vehicles, but check your owner's manual for coolant testing specifics as well as the location of the coolant reservoir or radiator cap. Whether you're prepping for summer heat or winter cold, testing your coolant is a simple step to make sure your engine stays running cool year-round.

Supplies Needed for This Job:
1. Safety Glasses: orly.cc/4e7cFKz
2. Gloves: orly.cc/3YKu3QZ
3. Antifreeze & Coolant: orly.cc/4hLw99S
4. Prestone Antifreeze Tester: orly.cc/3Qkb7Ug

0:35 Feel the Radiator or Hoses to Ensure Coolness
0:45 Inspect Coolant Level
1:35 Draw Coolant into Your Antifreeze Tester
1:45 Read Coolant Level
2:00 Top Off Coolant Level

Checking your coolant health is essential for preventing overheating, freezing, and protecting your engine against damage. Regular antifreeze checks are key to preventing engine damage from extreme temperatures. O’Reilly Auto Parts has the coolant testers, antifreeze, refractometers, funnels, and more to help you maintain your vehicle’s cooling system and keep your engine running and cool in any season. Visit our How-To Hub for helpful articles including the types and colors of antifreeze, what causes a car to overheat, cooling system basics, and much more to help you protect and extend the life of your vehicle.

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First, make sure your vehicle’s engine has been off for a few hours, or overnight.
A hot cooling system is pressurized and opening it can cause antifreeze to spray out and cause injury.
Feel the radiator or hoses with the back of your hand to ensure that the system is cool.
Once you’re sure it’s safe, remove the radiator cap or coolant reservoir cap.
Use a flashlight to visually inspect the coolant level and condition.
If your vehicle doesn’t have an overflow tank, the level might be a little lower to allow for expansion at operating temperature.
Antifreeze comes in several different colors, but its appearance should be slightly transparent.
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How To: Test Antifreeze

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