Inverter Coolant change required?

[tai]

About to get the 30,000 mile service on my 05 Prius and was told that one of the services required was a change out of the Inverter Coolant. I checked the service checklist and it only says; check inverter coolant. Anyone aware of this "required" change out. The reason I ask is that everything else one could do themselves, filters, oil change, fluid levels, rotate tires, etc. But the charge is over $300.00 The fluid changeout must be expensive?

Has anyone had this service done on their Prius (coolant changeout)

Love the car and would buy another in a heartbeat, however the wait in Austin was one year!

[theyotaguy]

Toyota says that the first change-out of their "super-long life" coolant is @ 100,000 miles,and every 50,000 after that.Only you can decide if you wish to maintain your vehicle at a higher level than they recommend based on your intended longevity of the vehicle.Comments on this forum will range from exasperation over the price at the "stealer"ship to recommending the clear universal crap from Prestone.Other than saying please don't use the clear crap,I'm kinda weary of the debate and will leave it up to you.

[mustang67408]

Word of warning : If you change the INVERETER COOLANT. BE CAREFUL to make sure the system is bled of all AIR POCKETS. I usually drain the system, fill it, let it run for 15 minutes (switch on , no ready light- this runs the inverter coolant pump) check the level in the resovoir and open the air bleeds to allow trapped air to escape. I continue to do this for 1- 1 1/2 hrs. Then give it a good roadtest and check for air 1 last time.
If the Inverter overheats, weird things start to happen.
Please use only the Toyota recommended coolant, its premixed.
If you use something else and dont get the mixture correct it will cause other problems, such as overheating the inverter.

Personally the Toyota stuff lasts along time in the inverter, it basically just circulates and only gets hot from electrical components, unlike the coolant in an engine that takes alot more abuse.

[theyotaguy]

Originally Posted by mustang67408

Word of warning : If you change the INVERETER COOLANT. BE CAREFUL to make sure the system is bled of all AIR POCKETS. I usually drain the system, fill it, let it run for 15 minutes (switch on , no ready light- this runs the inverter coolant pump) check the level in the resovoir and open the air bleeds to allow trapped air to escape. I continue to do this for 1- 1 1/2 hrs. Then give it a good roadtest and check for air 1 last time.
If the Inverter overheats, weird things start to happen.
Please use only the Toyota recommended coolant, its premixed.
If you use something else and dont get the mixture correct it will cause other problems, such as overheating the inverter.

Personally the Toyota stuff lasts along time in the inverter, it basically just circulates and only gets hot from electrical components, unlike the coolant in an engine that takes alot more abuse.

And at what mileage do you recommend a change?

[mustang67408]

Originally Posted by theyotaguy

And at what mileage do you recommend a change?

Whatever the standard 05 Prius manual says. (100K) Attached is the sheet we use straight from Toyota.
Doing earlier IMO doesnt do much, but like you said

Only you(he) can decide if you(he) wishes to maintain your(his) vehicle at a higher level than they recommend based on your intended longevity of the vehicle.

Its his vehicle.
I am only talking about the INVETER.
Just trying to warn him or anyone, if they do their own coolant change to be careful. The invereter is a bear to get rid of air pockets

[theyotaguy]

They are the same coolant and the same interval according to Toyota.I just presented facts,as debates like this have really started to wear on me:
Coolant Change Question


So what do you recommend for engine coolant?


I'm not fond of the extended drain intervals either,but the DIY'ers that decide to do maint. more frequently aren't the ones being called "stealers" all over the forums either.And some days it seems like every customer that opts to have their coolant changed earlier also has a DIY pal more than willing to tell them how bad they got ripped off,even though they do the same thing to their own.......blah,blah,blah......I'm not trying to put you on the spot,Victor-I know you experience the hypocracy of it all,too

[mustang67408]

Originally Posted by theyotaguy

They are the same coolant and the same interval according to Toyota.I just presented facts,as debates like this have really started to wear on me: I agree with you.
Coolant Change Question


So what do you recommend for engine coolant? In the prius 100K like the factory says, the engine may start and stop alot more than most engines, but doesnt nearly runs as long. The transaxle/generator takes more abuse than anyting else. I would probably service it more than recommended.


I'm not fond of the extended drain intervals either,but the DIY'ers that decide to do maint. more frequently aren't the ones being called "stealers" all over the forums either.

I dont like the long oil change intervals either. I am old school, so it might just be a matter of mind set. I change it at 2500miles, no- if -ands or -buts.
I service the diff in my truck every other oil change.
I service the trans every other oil change and flushed it at 15K and 30K miles. Mostly the reason i do it is because I can and it doesnt cost $$$$.
I serviced most of all my other vehicles as recommended and they all lasted a long time.
Theres more in life to worry about than Cooalnt PH/Acidity, Oil analysis, ect....YAWN

[jimb1300]

Originally Posted by theyotaguy

Toyota says that the first change-out of their "super-long life" coolant is @ 100,000 miles,and every 50,000 after that.Only you can decide if you wish to maintain your vehicle at a higher level than they recommend based on your intended longevity of the vehicle.Comments on this forum will range from exasperation over the price at the "stealer"ship to recommending the clear universal crap from Prestone.Other than saying please don't use the clear crap,I'm kinda weary of the debate and will leave it up to you.

Hi, a little help please... I understand this fluid is coolant for the inverter similar to the engine coolant. What would be the effect of adding brake fluid to the inverter fluid. This has occured on my 02 Prius....Thanks.

[mustang67408]

Originally Posted by jimb1300

Hi, a little help please... I understand this fluid is coolant for the inverter similar to the engine coolant. What would be the effect of adding brake fluid to the inverter fluid. This has occured on my 02 Prius....Thanks.

If the brake fluid is not flushed out it MIGHT swell all the rubber hoses and affect the PLASTIC INVERTER WATERPUMP. It all depends on how much was added, Did the coolant absorb the brake fluid like water does?
I would not take a chance on it.
I would have someone who knows how.... flush that system.
The Inverter coolant system is very difficult to service as it will develop
an air pocket and has to be bled out. It takes usually in excess of 1 hr to do this time consuming job.

[DRIVER_X]

This is a pretty important subject. I am amazed this thread has so few posts.

Here is my 2 cents on the subject..

I currently have over 165k on my 04' Prii. Before I got my car in July 04', I drove a combined 70k on 3 leased 04' Prius.

I found ALL, I stress again, ALL of the dealers in my area are pretty ignorant about the car. If you are a dealer tech and you are reading this I just want you to know I don't mean to offend you.

.. I never changed my coolant not because I don't want to maintain the service schedule... I WON'T do it because I don't want my car to be a Guinea Pigs for the 'supposedly' highly Training Prius Tech! I spoke to many shops in my area, everyone of them 'knows' what to do but everyone of them is telling me a different way on how to do it right.. for starter, half of them are sure the invertor/elec. motor coolant is part of the engine cooling system.. half of them 'think' they are separated.. well?? Which one is it?

I don't claim to know about the stability of the long life fluid made by Toyota, however Knowing somewhat the design for Prius, I see very little chance the exhaust or engine oil can seep through into the cooling system like a 'normal' gasoline engine because of the substantially lower stress on the engine. Premixed with de-ionized water at the factory, I also see very little chance the coolant in the system can corrode anything prematurely. On the other hand, I can totally see a dealer tech not knowing what to do and ending up left behind pockets of air in the system.. AND adding tap water with questionable quality into the cooling system which WILL MOST DEFINITELY leaves behind calcium/chlorine in your cooling system. Worst yet, they might offer to 'flush' the system with machine that will basically 'vacuum' the coolant in the system out, which COULD potentially putting unnecessary stress on the head gasket or seals..

My advice, if you know someone who really really knows what to do.. change your coolant at 100K. If not, don't change it until you find a qualified person to do it.. I am here to tell you, my coolant in both reservoirs are as red and as clean as the day I got my car.. I'll take my chance here.. Until I am comfortable enough with the tech. I won't change it!

[mustang67408]

Originally Posted by DRIVER_X

This is a pretty important subject. I am amazed this thread has so few posts.

Here is my 2 cents on the subject..

I currently have over 165k on my 04' Prii. Before I got my car in July 04', I drove a combined 70k on 3 leased 04' Prius. Great Car

I found ALL, I stress again, ALL of the dealers in my area are pretty ignorant about the car. If you are a dealer tech and you are reading this I just want you to know I don't mean to offend you. Some of us appreciate this.

.. I never changed my coolant not because I don't want to maintain the service schedule... I WON'T do it because I don't want my car to be a Guinea Pigs for the 'supposedly' highly Training Prius Tech! I spoke to many shops in my area, everyone of them 'knows' what to do but everyone of them is telling me a different way on how to do it right.. for starter, half of them are sure the invertor/elec. motor coolant is part of the engine cooling system.. half of them 'think' they are separated.. well?? Which one is it? They are 2 completly different systems, each has its own pump and resovoir.

I don't claim to know about the stability of the long life fluid made by Toyota, however Knowing somewhat the design for Prius, I see very little chance the exhaust or engine oil can seep through into the cooling system like a 'normal' gasoline engine because of the substantially lower stress on the engine. Premixed with de-ionized water at the factory, I also see very little chance the coolant in the system can corrode anything prematurely. On the other hand, I can totally see a dealer tech not knowing what to do and ending up left behind pockets of air in the system.. AND adding tap water with questionable quality into the cooling system which WILL MOST DEFINITELY leaves behind calcium/chlorine in your cooling system. Worst yet, they might offer to 'flush' the system with machine that will basically 'vacuum' the coolant in the system out, which COULD potentially putting unnecessary stress on the head gasket or seals..

My advice, if you know someone who really really knows what to do.. change your coolant at 100K. If not, don't change it until you find a qualified person to do it.. I am here to tell you, my coolant in both reservoirs are as red and as clean as the day I got my car.. I'll take my chance here.. Until I am comfortable enough with the tech. I won't change it!

2000-2003 Prius have the Normal long life coolant, 30K miles interval change as told to us by toyota (see attachment "2002")

2004-->present Have SUPER long life coolant, reccommended change @ 100K (see attchment "2004coolant")

The attachment "2004" is for a 30K mile service and doesnt not reccommend any coolant change at all.

Prius engines dont run all the time. I agree with you and dont change it until 100K.

I have attached a picture that shows the ENGINE cooling system.

I have attached a picture of the inverter cooling system. It uses the lower part of the radiator.
The Vehicle radiator is actually 2 radiators in 1.
The top half is for the engine and the lower 1/2 is for the inverter.

I hope this helps clear things up for you.