This week on Car Talk, remember Heather's Volvo that was dying at high altitudes? Tom and Ray get an update on Helmut the Cranky Mechanic, who may have caused the problem. Did he finally 'fess up? Find out on Stump the Chumps. Elsewhere, Elizabeth thought a herd of cows was following her on her summer road trip, until she realized the mooing was coming from her air conditioner; Bruce just learned why you shouldn't buy a used car from your brother; and Wendy's wondering if a vintage Beetle can handle a drive from Kansas to Washington, DC in less than, say, six months. Also, did Tim's drive on washboard roads crush the engine mounts on his wife's Saturn? And, if so, how much laundry does he need to do as penance? All this, and lots more, this week on Car Talk.