Overheating at idle
I have an 2007 Quattroporte that overheats when its idling, but is fine when driving down the road. The fans are pushing air and I have checked the relays, bench tested them (successfully) then made sure they actually kick on when in the vehicle. 1st and 2nd stage fan relays both "energize" at least. So I am thinking I can rule out the two water temp sensors, fuses and relays.
I am confident the fans are getting power and are both blowing air. I am not however certain they are running "full speed". I do not really know how to test for that. I assume the 2nd stage fan relay is supposed to "kick it up a notch" on speed, but again, not really certain on that.
Hope someone is familiar with how this fan system works and maybe, is it possible the fan itself can just be failing / running slow? Wasnt sure if fans could even slow down to that extent where they would just go slow. Figured it would be all or nothing.
Also, if anyone has any insight as to where the resistor would be that I had seen mentioned by others, it would be a huge help. I cannot locate one (them?). Thanks!