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afterrun thermoswitch BTDT

Having determined that my afterrun switch is in need of replacement (or at least that the fan & pump both make noise when the switch is shorted out, but never turn on after-otherwise), how much coolant comes out when this switch is removed (on a 3B). All that was in the head? Just what's in the little pipe there? Depends on whether or not the expansion tank cap is loose?

Can I mix the Audi orange coolant with Texaco orange coolant?

Full of questions,
Henry Harper
1991 200 quattro, 87k, summer oil but no afterrun going on, might want to fix that before it gets warm out
1988 GTI 16v, 177k, finally got that new oxygen sensor put it, better warm idling now