RE: Coolant Test with Floating *****
Update on Cold Chek tool. I got a new Cold Chek tool. This one has 6 *****. When checking the 50/50 coolant mix, now 5 ***** float. This indicates -40F approx. I checked my old Cold Chek with 5 ***** and it was still off.
Since I always flush these tools with tap water I suspected that calcium from my well water may have put a slight coating on the plastic ***** making them a littler heavier than normal. Used the tool to suck up some vinegar. Left it in there for about an hour. Then flushed it out with clear water and checked the coolant. Now it read coolant correctly.
Guess the best thing to use whencleaning these floating ball indicators is distilled water.