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Inverter coolant pump
Hi,
We've seen two, possibly three inverters in the older NHW11s that appeared to lose their 12 V DC-to-DC converter. It also seems to correspond with inverter pump failure. Funny coincidence.
Regardless, Hobbit analyzed Prius inverter coolant pumps and found both the NHW11 and NHW20 use a single bearing mounted shaft. In contrast, the 2010 (ZVW30) has a redesigned, dual-bearing shaft, three speed pump, part G904048020. I've found them new at Champion Toyota for ~$160 and am trying to get one from a salvage. I've also ordered the electrical schematics manual to join Vol. 2.
The other night I went out to 'listen' to my pump and though I could barely hear it, I was able to verify turbulence in the reservoir. With 130,000 miles, I'm thinking replace the inverter pump before failure rather than risk an inverter failure.
More about this as details emerge.
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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