My 02 OBW has 138K on it. Found the Temp needle sky high ten minutes into a drive. Added some water and noticed that if I kept the RPMs up above 3000 the temp stayed down and heat worked. Once I get the RPM down around 2000, the heat cuts off and temp goes up. I thought this means the water pump is bad. But I found out from my stealership friend that the OEM water pumps never fail moving some water. I checked and it looks like I get the bubbles in the coolant when I rev it up from a cold start. And one cylinder is not firing at idle. So is it the dreaded HG issue? thanks
mike