The odor is caused by a buildup of a fungus on the evaporator core. That fungus is related to the kinds of fungus that cause athlete’s foot and jock odor.

Some of the most difficult diagnostic problems seem to involve vehicle computer operating strategies.

Welcome to the latest installment in our multi-part series on exhaust gas analysis.

Do you really know all the ins and outs of every system? Can you diagnose the really tough ones? If you can, do you know what is happening and why?

One of the joys of the lab scope is its simplicity. If you take away all the buttons and dials on an oscilloscope, it’s really just a voltmeter that allows us to look at voltage levels over time.

If R-12 is unavailable in your area, or has become too pricey, you’ll have plenty of prospects for retrofits to R-134a.

Each manufacturer has a different way of drawing schematic diagrams. What they will or will not put in a schematic diagram for our assistance also varies a great deal.

Look at the additional information to be gained from consideration of a third gas, oxygen (O2), the “lean indicator.”

To keep things interesting, perhaps we can look forward to hunting for oil leaks that refuse to drip on anything except a clean piece of paper on the owner’s garage floor.