I have an AQ131d in my sun runner. It has a heat exchanger on it. Right now it is running fine and the temperature is good, but I can hear a grinding noise like a bearing going out on the water pump. I've been checking around and it looks like it'll be about $350 to get a new one. I found one that is aftermarket that is the same replacement part number as the one that I found on the volvopentastore webpage, but it says that it is for a 2.3 liter volvo car engine. Is there any difference between these water pumps? Thanks!