Challenging a thorny diagnostic problem might be, however satisfying a really difficult or unusual no-start, it is the bread and butter work that distinguishes a business from a hobby.

How electronic components fail during expansion and contraction and demonstrate how to artificially induce the Thermal Curve to find expansion and contraction problems inside solid-state components.

We’ve gathered some additional information on the subject since we visited it in December (“Brrr … Humbug”), and it may prod you to consider the purchase of cooling system drain and fill equipment.

Look for the U.L. tag that indicates whether the product has been tested and certified by Underwriters’ Laboratories.