I changed my impellor yesterday and it was relatively easy, but I'd like to smack the GM or Volvo engineer that decided it was a good idea to put the fourth screw in between the water intake and outtake valves. I knew there were four screws, I just didn't know where the fourth one was until I was leaning over the engine looking between the two hoses. I pretty much unscrewed it by feel and luck. I ran four years on the same impellor. It looked brand new, but I think I will add it to my spring to-do list for peace of mind.
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2004 268 Vista "Satisfy My Sol"