thank you, i found one on the net and will change it as soon as it comes in. I must have been brain dead not to think of smog pump, its hell getting old, I looked and found alt, p/s pump a/c compressor and water pump, by following the pulleys but never thought about the smog pump. DUH!, I'm in california the state with the grey sky. yOU WOULD THINK THEY WOULD LAST LONGER THAN 170K, being a Mercedes and all. I wonder what is chronic to fail on these things, I just had to replace the coils, but the wiring and evap are working, at least they were untill I said something