How to Replace the Inverter Coolant Pump

The service manual does NOT specifically say that. Here is a quote

"In order to avoid technical problems, only use "Toyota Super Long Life Coolant" or similar high quality ethylene glycol based non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life hybrid organic acid technology"

If you search for a non-silicate, non-amine, non-nitrite, non-borate HOA coolant, that is a VERY short list. Absolutely *not* the cheap green stuff at the parts store

 

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Prestone extended life is non-silicate, non-amine, non-nitrite, non-borate, is yellow, not green. I don't know what HOA (sounds like Toyota marketing) is, and but I can't see any technical reason why Prestone should cause any problems. I didn't look at other brands, the Pretone was on sale, and the cheapest thing in the store after the rebate, although I wouldn't trust any brand, any name brand for modern engines should be fine. The invertor should be even less stressful on the antifreeze then the engine. Just a bunch of tubes in the case with fluid flowing in it, with a much lower heat load then the engine. But hey, its your money, spend it anyway you like.

Howard

 

The Prestone Extended Life is completely different than their cheapest green stuff that has silicates, nitrites, borates, etc. HOA : Hybrid Organic Acid.

Not too many folks realize that the cheapest ethylene glycol stuff is very bad for modern aluminum motors. That cheap stuff would also ruin a heavy duty diesel engine, the wet cylinder liners would experience erosion, o-ring leaks, and a catastrophic failure

What I find unusual is that different Toyota dealerships appear to charge different prices for service items, eg the premixed SLLC, the WS fluid, etc.

I priced the Prestone Extended Life at Canadian Tire, it was undiluted and you're supposed to dilute to the correct mix. It wouldn't be a very good idea to use tap water, especially if the tap provides hard water. I'd use distilled water

Compared to my local dealership, their premixed gallon of SLLC was $1.50 more than the undiluted Prestone stuff at Canadian Tire. At the most, I'd "save" $3 getting the Prestone stuff and doing it myself

I'll stick with the SLLC

 

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I have replaced the Inverter Coolant pump - by following your instructions. Now, how do I get the warning lights to go off?

 

I'll side with Jayman. Using 3rd party fluids sounds penny wise and pound foolish.

 

when I start up turn the ignition on the "PROBLEM" light comes on, along with the red caution triangle and the check engine light, I know that the lights are associated with the pump because i used a code reader and got the result " Inverter cooling system performance." the inverter doesn't rly make a noise now. it just vibrates. as to the turbulance, i don't really see it but then again by the time i got it in it was night.

 

Did you make sure not to mix up the two hoses?

 

yes, i did.
about 3 quarts.
the lights were on before i replaced the pump. i replaced it and expected it to go off. it didn't
yes, i was sure to not mix the hoses

 

about 125 k. no accident. it definatly sounds like an aquarium pump, and P0A93 is the one.

 

The pump is running quietly with no air bubbles. There were no symptoms or problems with the car before the light came on. How do I check the battery?

 

Voltages on jump point:
12.4 - 12.8 with car OFF
13.6 - 14.4 with car Ready

What do you find?

Or use the no-tools selftest procedure:
PriusOnline.com • View topic - how to put 12V battery in sleeping mode?

 

Thank you Patrick Wong for posting the info on relacing the inverter pump.
I have 81k on my 2006 prius and figured I better change mine before I got stuck on the road someplace.

I bought the replacment G9020-47031 and just changed it out today.

I had 2 problems:
getting the electric plug disconnected and getting the old pump out.

I took some pictures that might help others doing this repair.

picture#1: I removed the inverter bracket my finger is pointing to, this gave me more room to work. it is just 3 bolts and the inverter is still supported by a bracket on the other side.

picture#2 just a shot of the old pump after inverter bracket was removed.

picture#3 I used these pliers to remove the electric connector. also see picture#8 ... I am showing how you have to squeeze the top of the electric connector to lift off the coolent pump.
NOTE: don't squeeze to hard with the pliers because you could break the connector.
you don't need alot of pressure.... it is just that there is no room to get your fingers in there.

picture#4 I am showing the position of the pump and how it is removed.

picture#5 I am showing the next step in removal of the pump.

picture#6 I am showing the final removal position.