GMC Yukon No-Cranking Complaint: The 1,300-Mile Test Drive
This month’s Diagnostic Dilemma is about the technical and professional issues involved with attempting to diagnose an extremely random no-cranking complaint on a 2003 GMC Yukon equipped with the 5.3L VIN Z engine and automatic transmission. I use the word “attempting” because if we get authorization to proceed in the next thirty days, I have
Starter and Theft Deterrent System Diagnostics
The electric starter motor took the place of the hand crank a long time ago. Although, the actual starter motor has improved quite a bit over time, its function is still the same. Just like most of the systems in today’s cars, the simplicity of the basic functions of a circuit remains the same, but
A New Look at Cooling System Technology
While changes in modern cooling system technology might not be apparent in day-to-day servicing, the fact is that auto manufacturers are continuing to increase fuel economy and power output by changing how the cooling system operates. But technical change has developed very gradually. In the beginning, a few turn-of-the-century auto manufacturers relied on a thermal-expansion
