Ok...here's the deal, my catera had an issue over the winter with very little heat while idling, so I purchased 2 aux water pumps and a t-stat. The pump on the drivers side does not seem to be running as if there is no power running to it. Is there a relay that kicks this on or should it be running at all times? And finally, what the title of this thread says...the weather has been getting warmer, and I find my Catera overheating, maybe because that 1 pump not kicking on? There are no clogs in the system, everything has been flushed, another thing I noticed is that when it begins to overheat, I shut the car off and it begins to leak antifreeze from the backside of the motor, looks to be like a plastic cylider type of part where there are a few hoses connected...may this be the problem of my overheating? Any help would be of great thnx!!!