My mechanic has an easier remedy ,just dissconnected the hose at the junction near the key ,took 4 ft of hose ,the mity vac hand pump and five minutes.I turn the car off first when ready to kill the engine,pump the handle 3 times and thats enough to pull vacuum on the turn off piece in the IP.No more hood raising in the parking lot ,people look at you like ,man what a piece of junk ,and I smile back and think to myself ,these people have no idea of what a good deal these old mbs are,not to mention no monthly payments to the AUTO GIANTS.Paint , some a/c and vac line repair, Ill have a very reliable machine.