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2011 Sienna coolant change, drain and refill ? #4695573
03/15/18 11:35 AM
03/15/18 11:35 AM
Joined: Apr 2013
Posts: 56
New Jersey
mister_two Offline OP
mister_two  Offline OP
Joined: Apr 2013
Posts: 56
New Jersey
Van has just over 90k miles, almost 8 years old, coolant has never been changed. Planning to change the coolant this weekend before a long trip to FL. Should I just drain and refill? I have 3 gallons of Pentofrost A4 ready in the garage along with a couple gallons of distilled water. Or should I drain and refill with distilled water and run the car to flush out the remaining coolant? I see Chrisfix videos on youtube and he flush the system with distilled water a couple of times before refilling with coolant. Is that really necessary?


2000 Accord SE 211k
2000 S2000 45k
2011 Sienna XLE 88k
Re: 2011 Sienna coolant change, drain and refill ? [Re: mister_two] #4695621
03/15/18 12:27 PM
03/15/18 12:27 PM
Joined: Mar 2014
Posts: 662
Twin Cities MN USA
Inspecktor Offline
Inspecktor  Offline
Joined: Mar 2014
Posts: 662
Twin Cities MN USA
Modern coolants don't degrade like the old formulas. If the coolant in the radiator looks clean, I would just drain and refill as long as the Pentofrost is compatible. If not, flush with distilled water and mix the new 60-40 and run it.


2001 Ranger 3.0 156,000 mi
2006 Dakota 4.7 155,000 mi
1986 GL1200A 72,500 mi
2001 Buick LeSabre Limited 291,500 mi
Re: 2011 Sienna coolant change, drain and refill ? [Re: mister_two] #4695670
03/15/18 01:15 PM
03/15/18 01:15 PM
Joined: Mar 2012
Posts: 1,275
San Antonio, TX
E150GT Offline
E150GT  Offline
Joined: Mar 2012
Posts: 1,275
San Antonio, TX
I did a drain and fill on my wifes yaris at 100K. The original coolant was a little darker but clean so I didnt feel like a distilled water flush was necessary. I did however use the same factory coolant that was in there. I might do a distilled flush if I was changing over coolant brands.

Last edited by E150GT; 03/15/18 01:16 PM.

1984 Mercedes-Benz 300SD - 100k
1995 F150 XL 4.9 reg cab 5MT - 251k 5w30
2016 Mazda6 Touring 6MT - 57k 10w30
2006 Buick Lucerne CXL 3.8 31k 5w30
Re: 2011 Sienna coolant change, drain and refill ? [Re: mister_two] #4695676
03/15/18 01:16 PM
03/15/18 01:16 PM
Joined: Oct 2008
Posts: 12,471
The Old North State
Sayjac Offline
Sayjac  Offline
Joined: Oct 2008
Posts: 12,471
The Old North State
Originally Posted By: mister_two
... I see Chrisfix videos on youtube and he flush the system with distilled water a couple of times before refilling with coolant. Is that really necessary?

I just depends on what you want to do and are comfortable with. Yes, doing a distilled flush series before using new AF will give you the longer/full recommended service interval.

The issue with that is, A4 like majority oem Asian AFs is a premix. Unless you plan on finding and using the block drain(s) you'll have a difficult time getting a 50% AF concentration. Depending on drain location(s) it can be a pain. Other way is to run the new A4 premix through the system with d&fs until you reach 50% concentration as tested by and AF tester/hydrometer. That is a wasteful process.

My advice, just do a radiator d&f with A4 premix and shorten up the service interval. Do it again in 2-3 years.

Re: 2011 Sienna coolant change, drain and refill ? [Re: mister_two] #4695688
03/15/18 01:26 PM
03/15/18 01:26 PM
Joined: Jan 2004
Posts: 4,142
California
nthach Offline
nthach  Offline
Joined: Jan 2004
Posts: 4,142
California
Just do a drain and fill unless you see flotsam draining out of the radiator. Japanese cooling systems typically run pretty clean if you stick to OEM or pHOAT coolants.

Re: 2011 Sienna coolant change, drain and refill ? [Re: mister_two] #4695697
03/15/18 01:35 PM
03/15/18 01:35 PM
Joined: Dec 2017
Posts: 2,301
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 2,301
SE British Columbia, Canada
I have a method that I consider to be a poor boy flush. I drain the coolant from the rad. I close the drain valve (or in a newer car, put the lower rad hose back on). I fill the rad with distilled water (it's cheap). I then take it for a ride and turn the heater on until the engine is at operating temp and the heater is blowing hot. I go home, have a beer and let it cool off. I then drain the rad again. Now, if I feel like it, I dump in distilled water again and repeat. When I drain the rad for the third time it's pretty clear. I then put in the full strength coolant equal to about 60% of the system and top off with distilled water. I then take it for another ride to get rig of any air bubbles and touch up the tank with 50/50. I have on hand a few extra empty jugs to store the the coolant from the three times I drained the radiator. I dispose of the fluid at the local recycle place. I never bother with the block drains and I don't bother with a flush compound but I guess I could. Done for 5 years. My oldest car has 17 years on it, and has had 3 poor boy flushes like this. Still on the original radiator and water pump.

Last edited by Snagglefoot; 03/15/18 01:42 PM.

If you want the job done right......do it yourself.
Re: 2011 Sienna coolant change, drain and refill ? [Re: mister_two] #4695788
03/15/18 03:20 PM
03/15/18 03:20 PM
Joined: Feb 2011
Posts: 6,718
Hudson, NH
LeakySeals Offline
LeakySeals  Offline
Joined: Feb 2011
Posts: 6,718
Hudson, NH
If it's Toyota pink it's good for 150k. But I would do it anyways at 100k and I would not swap it out with something else. Toyota makes the best coolant on the market IMHO


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
Re: 2011 Sienna coolant change, drain and refill ? [Re: mister_two] #4695792
03/15/18 03:21 PM
03/15/18 03:21 PM
Joined: Feb 2011
Posts: 6,718
Hudson, NH
LeakySeals Offline
LeakySeals  Offline
Joined: Feb 2011
Posts: 6,718
Hudson, NH
The answer is no it's not necessary because of the chemistry of the factory coolant.


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
Re: 2011 Sienna coolant change, drain and refill ? [Re: mister_two] #4695794
03/15/18 03:22 PM
03/15/18 03:22 PM
Joined: Sep 2007
Posts: 966
TX, USA
JMJNet Offline
JMJNet  Offline
Joined: Sep 2007
Posts: 966
TX, USA
For Toyota, you just need to do a drain and fill.

The Toyota coolant is silicate free.

Last edited by JMJNet; 03/15/18 03:23 PM.

  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel


Re: 2011 Sienna coolant change, drain and refill ? [Re: mister_two] #4696435
03/16/18 08:33 AM
03/16/18 08:33 AM
Joined: Jun 2003
Posts: 625
McGregor TX
mrdctaylor Offline
mrdctaylor  Offline
Joined: Jun 2003
Posts: 625
McGregor TX
Drain/fill is all I've ever done with my 2002 Tacoma since new. I used to use red, now I use the pink. I've yet to touch the cooling system on my 2012 Highlander, but that's all I plan to do to it too.


02 Tacoma 3.4L, 219K, Magnatec 10W30
02 Trailblazer 4.2L, 179K, Edge HM 10W40
12 Highlander 3.5L, 96K, M1 EP 0W20
17 Escape 2.0L, 31K, Hav ProDS 5W30

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