Thanks HDDP. I have a question that you would probably know. What tells the I/C pump to come on, tempeture or does it run when the car is running? I could not tell if the pump was running or not yesterday. And another question I had too, I was wanting to make sure the sending unit was not leaking before I put the front bumper cover back on. Since both cooling systems share the overflow resevior, shouldn't the pressure be the same in both systems even if the S/C system is not up to a higher operating temp?