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International Automotive Technicians Network
Re: Dex-Cool -High Stray Voltages in low mileage coolant
Posted to Technical Discussion Forum on 5/29/2002

Some blower motors are not well grounded. This forces static electricity that builds up in the spinning fan to discharge to the heater core and ground through the coolant. Heater core damage can result.

A few cars have switched to ground side control of blow... Login to read more.