P0A93 code

Hello. I have a 2004 Prius with around 240,000 miles (replaced engine). Here's my issue:

I am getting the P0A93 code after driving around for about 20 minutes on a hot Texas day. During the winter I don't have the same issue. I have replaced the inverter and the inverter pump (Toyota OEM part). I bled the system as well to remove the air bubbles. When driving around I get all the Christmas lights on the dash and after checking the code, its again the P0A93 code. When looking at the coolant storage tank there is no disturbance. So it still seems like the flow of coolant is not happening. I am at a loss at this point. Both radiator fans are working.

 

Bought from the Toyota dealer and replaced one that was (likely) working as well.

 

I didn't drain the coolant. I just clamped and replaced. I bought the new inverter part yesterday. I bought a new (Dorman) last year and I replaced it thinking that it might be the issue. But I am really not sure if it was. The hoses are all vibrating and the pump is on and also vibrating. When I bleed the system, how fast should the coolant flow? Its more than a trickle but its not really pumping that hard either. Isn't the fact that the system is bleeding with coolant running through it a sign that the pump is working as well?

 

I am looking at the hoses....the ones that I can see are fine. But I know there are some down below which I haven't really looked at. Yeah its not moving at all. But it wasn't with the old inverter pump. I just don't think its the pump at this point and am trying to figure out what else it could be.

 

I got down under the car and all the hoses are routed correctly according to the diagram. The one at the bottom is vibrating when I touch it but not the other and not the one leading to the inverter radiator. I feel like there is a blockage somewhere. Perhaps enough of a blockage that is allowing the system to circulate during the bleed but not enough to cool the inverter while driving?

 

Yes.

 

I feel like this might be an electrical issue. Could the pump have enough juice to bleed and turn on, but not enough to circulate the coolant properly?

 

Yes correct. That is how I bleed it (not in ready mode....2 presses of the start button). I get decent flow (same as the youtube videos I watch). It doesn't pump hard but its not a trickle either.

 

I will try that later today. I was looking at it but didn't do anything. I checked the fuse and it's fine. I am using the same reservoir. The new(used) inverter didn't come with one

 

Should there be only 1 prong on this?

 

Ok well I cleaned it up and re-seated it. No change. If I took this car to the dealership and asked them to analyze the lack of flow I wonder how much they will charge me. I am getting to that point. I don't know what else to do.