MEMOIRS OF AN INDEPENDENT REPAIR SHOP OWNER: Cold-Weather Cause-And-Effect (not “Tall Winter Tales”) — Part Two

Well, it looks as though winter is about done—at least from my vantage point west of the Rockies; but I still have a few more "revelations" to relate on the subject. As I stated in my last entry, these experiences were all new to me, since I'd never lived where "true winter" driving conditions were a regular occurrence. So, without ado, and as "green" as spring vegetation, here are a few more of my cold-weather "discoveries". While I wasn't unfamiliar with a parking brake (some call it an emergency brake—which may in itself be a subject for further discussion) stuck in the "applied" position, I soon found additional reasons for this to occur in true winter weather. Typically, on the West Coast, I'd see parking brakes sticking mostly because the brake shoes (we're talking about rear-drum systems here; as most vehicles in the U.S.—save for Corvettes and upmarket Eurocars—were so equipped at the time) were wet when the brake was applied, allowing the shoes to "bond" to the drums via the oxidation process. It seemed like the VW Buses of the day achieved the most notoriety for this phenomena—particularly unfortunate for the tech called upon to "unstick" them, if the "Plan B" drum removal process was necessary. In true winter weather, besides the "wet shoe scenario", there were other possibilities involving the actuating linkage under the vehicle. The worst was—and still is—when moisture would get down in the actuating cable and freeze the cable within its housing. The remedy would first involve some form of in-field procedure to free the brake enough to get the vehicle to the shop—or at least allow it to be maneuvered for towing—where it could be thawed enough to effect further repairs. Those "in-field" procedures were an eye-opener for me, as I had precious little experience in dealing with the weather conditions associated with them! Of course, the solution centered on using the right "gear" to minimize the effect of the harsh environment—along with resetting the Attitude Control to the "Mind-Over-Matter" position. After going through all that, the customer would usually be happy enough just to have the brake actuation reset to "off", and they would make a conscious effort not to use it during similar weather in the future. Speaking of in-field procedures in harsh weather, I can still recall the pain in my fingers while trying to reset distributor contact points well enough to make the vehicle run well enough to get it to a warmer place in which to work on it. When the ambient temperature got down to anywhere near 10F, this operation—as technically simple as it was—could be a real challenge (and provided one more reason NOT to mourn the passing of ignition contact points, for sure)! This was true of any procedure attempted in such conditions where bare hands were necessary. I also found that any of the vehicles fluid-carrying systems had to be completely free of moisture to operate properly in the cold. Typically, in my L. A. stomping grounds, a little emulsified moisture in the power steering system, braking system, or transmission wouldn't make its presence known—in the form of erratic operation—during the winter. During true winter, however it was a different story. I learned to make it a point to regularly change and otherwise properly maintain these fluids, so as to keep all traces of moisture out. When it came to the PCV System, I'd never heard of the PCV Valve and its associated plumbing rendered inoperative due to the water vapor passing through actually freezing. I had wondered why vehicles produced for the true winter market I'd been working on had insulation over the PCV plumbing. I remember reading a Honda Service Bulletin involving the retrofitting of insulation around the PCV valve and some of its plumbing, for the purpose of—you guessed it—reducing the possibility of system icing, and consequential oil-leak issues due to the ensuing over-pressurizing of the crankcase! I can't remember ever working on a vehicle actually experiencing a PCV icing problem, but it was all food for thought. Another cold weather bogey I learned to deal with involved the vehicle starting system. Component condition and circuit voltage drop rose to an extremely critical level, in comparison to the level acceptable in the warmer climes of the Southwest. If the battery, starter, or associated relay(s) were marginal, you'd know it when the weather turned cold—even though those components seemed to work all right in warmer temperatures. All of the test procedures and standards I learned during my schooling took on a new relevance, now. If things were not up to those standards, it turned out they flat-out just didn't work in the cold. I became a "believer" and learned the new level of "critical" necessary to keep my customers rolling without drama during the winter months. Phil ran a successful independent repair shop on the West Coast for close to 20 years, working over a decade before that at both dealer and independent repair shops. He is presently semi-retired from the business of auto repair, but still keeps his hand in things as a consultant and in his personal garage   from The Truth About Cars http://www.thetruthaboutcars.com

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