They usually involve opening the pressure cap and drawing a little liquid out of the system and into the tester. Be sure to let your engine cool down before you remove your radiator or coolant reservoir cap. Once the engine is cool, open the cap and suck a sample of coolant into the test tube. But, as coolant ages, the additives are depleted and can’t do the job anymore. In fact, worn coolant becomes a pretty darn good electrical conductor, accelerating internal electrolysis.
Many mechanics claim that testing the pH level of antifreeze is an effective way of determining its condition. Some professional repair shops offer additives ostensibly intended to insure a proper pH in your antifreeze. Learn different methods to test your coolant including doing a visual inspection, using a hydrometer to test the freezing point and boiling point, using a multimeter to check the antifreeze , and. Re: Testing Dex Cool antifreeze We just talked about this at school, and I think we decided that it should work, because what we found indicated that it was an ethylene glycol based coolant , it is the additives that are different. The relative density of an engine coolant may be used to determine the approximate percent glycol and the freezing and boiling points, given that the glycol type is known.