Jerther

I have doubts about this... First, isn't the heater element insulated? I don't believe that there is current flowing from the heater to the block. Here's the theory: --------------------- The phenomena explained in the quote is called Electrolysis. It does happen when there is current flowing in an electrolyte (here, the coolant) between two electrods (heater and block). Let's assume the heater is not insulated. Then, electrolysis should occure. The result of electrolysis of electrolytes depends on its nature. I don'T know for the coolant, but as for water... Electrolysis of water tipicaly generates O2 and H2 (Oxygene and hydrogene). On a DC circuit, the anode (+ electrod) gets oxidized because of the formation of O2 there, and because the metal is disolving. Add some salt to the water and Cl will be produced there, and Cl is VERY corrosive. As for the cathode (- lead) Hydrogene is produced there. ------------------ So, IIIIFFFFF there is current flowing... we have a rusting block, a rusting heater (both because the heater is powered with AC) and a highly explosive gas produced inside the engine... Either H2 alone, or O2H2 which is the PERFECT match for perfect combustion. And by the way, in electrolysis, whatever metal is used for the + lead, it WILL corode/disolve. Ever seen rusted stainless stell? I did. ;) So I really don't believe in current flowing between the heater and block. And another thing, it would really be stupid to allow the block to get voltage from the heater... You could touch your truck and get electrocuted... This is non sens.