The internal cooling fan is likely clogged. Remove the rear plastic cover (three Torx T15 screws). You will find a centrifugal fan made of plastic. Clean each fin with a toothpick. The exclusive manual notes: “If the fan is cracked, replace immediately—unbalanced fan destroys the motor in 2 hours.”
between this vintage model and current Bosch smart chargers? How to charge car battery using charger. bosch kl 1206 manual exclusive
Safety is a central theme in the Bosch KL 1206 documentation. Proper usage begins with precise connection sequences to prevent accidental sparks or electrical surges. The Ultimate Guide to the Bosch KL 1206