New Prius owner question about HV battery fan direction

Which vent are you referring to: the one along the passenger right seat, or above the hv battery?

 

That fan cannot run the wrong way. When that fan is blowing full speed, there should be a lot of air. Imagine the AC blasting out of the vents

 

Going by feel isn't all that reliable of a way to judge air direction. Hang some tissue in front of the vent by the back seat. It should pull the tissue toward itself rather than blow it away.

Also, I seem to remember that when the car is apart for installing the charger cable, you can see the flap on the air discharge port near the 12v battery and it should be getting blown open.

 

Regarding the possibility of the motor running backwards, it depends on the motor. If it's brushless, and I think it is, then it can't run backwards. However, since you have to cut and splice the wires to the motor, it can malfunction if it's backwards. In fact, my Prolong was one of the earliest models and there was an error in the wiring instructions to the fan controller box. The polarity was wrong on the wires from the charger cable to the box. It seemed to work but then would throw codes and light the big, red triangle. Pretty scary till Jeff sorted it out.

 

The later models of the harness are plug and play with no wire splicing.

Makes the install easy.

 

NICE!! Big time saver.

 

Know when you do the engine coolant loop, it will take some effort .

The CHRS thermos will also have to be drained and filled.

And it takes forever to get the loop completely topped up. Once you think you have it done, I’d check each morning on the radiator cap to ensure it’s topped up.

Good luck and keep us posted .

 

Flush it with distilled water

 

The thermos is pretty cool there is a valve that opens and a pump that fills it with hot coolant, then on cold start the valve sends warm fluid into the engine. Draining it with the little valve under it will get rid of the yellow antifreeze in it, though it will get to be filled and the bubbles worked out of the system on the first few drives so keep levels topped up and checked for the first week until everything stabilizes


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Here is what I know, the Prius antifreeze has a sealant in it that turns white when exposed to air, pretty nice because it seals leaks, but when mixed with regular yellow antifreeze it makes a sludge that can do bad things, like clog drainage ports, reduce radiator efficiency, causing overheating. I would drain it, flush it, drain it, fill it, run it a week and repeat. To be sure I had nice clean pink circulating everywhere.


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Pep boys is also carrying the Toyota coolant!
Both in the concentrate and the 50/50 mix.
I just don’t know how effective you’ll be flushing the thermos so I felt you’d be safest changing it. Measure what you drain out of the thermos before and after the flush. That should tell you it’s been rinsed and won’t pollute your new antifreeze with the old.


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