Hello everyone. I am facing a strange problem. My prius 2014 would pop up Engine sign with P261C in scan in a hot weather about 40°C. However in morning and in evening it never happens. I have changed 2 to 3 water bodies and the running is also pretty fine...Secondly I have noticed, it happens when I switch on air conditioning. Any exact diagnosis will be of a great help I deed.
I assume by "water bodies" you mean what I would call water pumps? Where have you obtained the water pumps you have installed? Do you have access to a scan tool that can show you the target and actual water pump RPM while driving? Do you have access to an oscilloscope?
Yep more W AC on . Maybe used pumps ! Take the plastic plate off see the round thing that spins . ? White plastic peeling . Bingo .make it so pump no move it. part 35 online
Yeah the water pump rather coolant pump, yes I got it scanned and checked it's target and real RPM, the RPM obtained have been quite higher that the target, one thing I ve notices is that while keeping the AC off, I can run the vehicle as long as I can even in extreme hot, What I wanna know is what is exactly the relationship between an air conditioning and engine cooling system? Is the ECU same? Any relay which is common in the path and causes coolant pump go off after getting heat up or else.
The condenser gets hot. And that hot air gets blown across the radiator. When the ac is running that is. So when it's off, the air going across the radiator is a lot cooler. Any way you look at it, the car is overheating. Maybe the fans are not blowing? But likely the coolant pump is failing.
You've just doubled or worse the load on cooling system very simply put. This must be all in town driving .?
When the ac is on both radiator fans need to run. This is important at city speeds and usually not needed at highway speeds. Simply open the hood , turn on the ac and check the radiator fans. The code could mean an electrical problem to the water pump but this seems unlikely if it does not overheat without the ac. See attached
