I used the Porsche 2 step switch on Dick's Volvo although I eventually hooked both fans up to the lower temp switch. I can get that PN if you're interested. I got a replacement (turns out the original one was OK) at Advance though they did have to order it. The radiator guy made a T that goes in the upper radiator hose and the switch screws into the small fitting on the T.
Dan
Dan
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