Whereas a coolant hydrometer tests the temperature of the antifreeze, a voltmeter tests for electrical currents. By using a voltmeter, we are able to check if the coolant running through your engine cooling system is carrying an electronic current. Coolant is not supposed to carry an electronic current through your engine cooling system, because it can tamper with your car’s computer system or cause serious damage to the inside of your engine. If we test your antifreeze, and the voltmeter tells us that your antifreeze is carrying a strong electronic current, it is time to replace it. But there is one more way to make absolutely certain that your coolant is in need of replacing. We can test the pH of your coolant to see if it is too basic or too acidic.
Napa Service Assistant
You don’t have to be an expert to know that preventive maintenance is the best way to make sure your vehicle is running properly. Use our interactive vehicle tool to learn about the maintenance and services your NAPA AutoCare Center can provide.