In Reply to: Thermostat Housing Does this apply to 540's too? posted by Jason Blitz on August 02, 2001 at 11:43:51:
I'm sure it does, since the 530 & 540 are based on the same engine design. Mine only leaked when the car was running, and the drip was visible by flashlight as a slow drip right at the top end of the lower radiator hose. The coolant drips on the spinning belts and is flung nicely around the engine compartment, making it hard to see. With the car off, I could also feel coolant on the bottom part of the radiator hose. (NOTE: BE CAREFUL OF THE SPINNING FAN WHEN THE CAR IS ON, AND KEEP FINGERS & FLASHLIGHTS WELL OUT OF ITS REACH!).
Based on feedback from this list, I don't think it's the pump itself, but just the plastic thermostat housing that attaches to the pump.