I plan on using one of these two-pin coolant temperature switches (part number 006 545 15 24, red color, M4X1.5X1 threads, on at 100C/212F, off at 95C/203F) to directly power the auxiliary fan from the fuse box:


The factory setup only uses this switch to click the auxiliary fan relay on and off and does not supply power directly to the auxiliary fan; once it clicks on the relay, the relay then draws power from the fuse box and uses this to energize the auxiliary fan power wire which powers the fan. Only small 0,75mm˛ wires are used at the coolant temperature switch because all they do is click on the relay when the coolant temperature switch turns on.

What I want to do is run power directly from the fuse box to the coolant temperature switch so that when the switch opens, it directs that power to the auxiliary fan power wire. Of course, I will use much larger wires such as 2,5mm˛ or 4mm˛. But, I do not know if the coolant temperature switch might short out or melt having the full power to the auxiliary fan running through it. This is what I want to know.

Granted, the switch will only have power flowing through it when the coolant temperature is nearly overheated, which would be almost never, and even then only for relatively short periods of time.

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
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