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#4674320 - 02/22/18 11:43 AM run straight coolant
slomo Offline

Registered: 08/23/13
Posts: 164
Loc: Oklahoma
Who has done this?

#4674324 - 02/22/18 11:46 AM Re: run straight coolant [Re: slomo]
kschachn Offline

Registered: 12/26/05
Posts: 9504
Loc: Upper Midwest
Why would you want to so this? In general, heat transfer is compromised compared to a water mixture, as is freezing point. Most automakers specify a maximum concentration and there's a reason they do so.

For reference here are a few threads on waterless coolants, including one you started a year or two ago:
1994 BMW 530i, 227K
1996 Honda Accord, 262K
1999 Toyota Sienna, 397K
2000 Toyota ECHO, 267K

#4674326 - 02/22/18 11:46 AM Re: run straight coolant [Re: slomo]
MotoTribologist Offline

Registered: 02/03/16
Posts: 576
Loc: NJ, USA
What do you mean by coolant? Are you referring to water?

#4674329 - 02/22/18 11:48 AM Re: run straight coolant [Re: slomo]
rollinpete Offline

Registered: 03/20/17
Posts: 498
Loc: West Ma.
50/50 for me
97 Ford Expl.Sport 4.0 ohv 4wd 5spddrive183k miles
Last Change;
Penn. Plat. HM. 5w30
Fram xg8a, Fram CA8141

I like my oil (slippery).

#4674343 - 02/22/18 12:00 PM Re: run straight coolant [Re: slomo]
Dave Sherman Offline

Registered: 01/03/06
Posts: 1082
Loc: Ohio
No, because it would be expensive and pure coolant does not transfer heat as well.
2015 Honda Pilot EX AWD
1977 MG Midget Valvoline VR-1 20W-50 Bosch Filter

#4674351 - 02/22/18 12:05 PM Re: run straight coolant [Re: slomo]
windeye Offline

Registered: 02/26/09
Posts: 200
Loc: NY, USA
No one should be doing this. Aside from the reasons mentioned already, straight (near 100%) coolant actually has a much higher freezing point than 50/50 mixed with water. Use de-ionized water or distilled water, or buy premixed from dealer.
2000 Mazda MPV LX, 192,500 miles
2007 Mazda 3 Touring, 105,000 miles
2013 Toyota Camry XLE, 85,000 miles

#4674367 - 02/22/18 12:21 PM Re: run straight coolant [Re: slomo]
Gimpy1 Offline

Registered: 08/24/17
Posts: 115
Loc: Displaced Texan in Mexico City
Never run straight coolant it doesn't transfer heat very well. Ideally straight DI water is the best coolant due to its ability to absorb heat, however using pure water leads to lubrication and oxidation issues. Most race tracks especially for motorcycles ban the use of coolant and will check you radiator to pass tech they only thing allowed is water wetter (purple ice or redline water wetter for example)
Question is why would you want to do that, just run what the OEM recommends, don't try to out think the automotive engineers, they test vehicles in severe conditions for a reason, plus running 12 or 14 quarts of pure coolant is way more expensive than diluting it.

#4674369 - 02/22/18 12:22 PM Re: run straight coolant [Re: windeye]
krismoriah72 Offline

Registered: 02/16/09
Posts: 1577
Loc: wv
If you dont do a complete block flush and drain and only do the petcock or lower hose removal.. you can run straight coolant then drain at a later date and install the 50/50 mix. There is a bit of coolant that doesnt get removed in a lower radiator drain so you wont technically be running 100 percent coolant if you just fill the rad with straight unmixed coolant.

#4674377 - 02/22/18 12:25 PM Re: run straight coolant [Re: slomo]
JMJNet Offline

Registered: 09/06/07
Posts: 950
Loc: TX, USA
Is there a particular reason to ask the question?
  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel

#4674378 - 02/22/18 12:26 PM Re: run straight coolant [Re: slomo]
69GTX Offline

Registered: 09/23/15
Posts: 3815
Loc: Connecticut
I ran 80-90% water + RL WW during hot summers on one of my old muscle cars that ran "hot." Would never think of running beyond 60-70% straight coolant. What's the advantage?

2001 Lincoln Cont 4.6L DOHC/ 39K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs

#4674380 - 02/22/18 12:29 PM Re: run straight coolant [Re: Gimpy1]
fredly Offline

Registered: 01/26/18
Posts: 9
Loc: DC
Why you think glycol coolants not allowed on race track? Reason has nothing to do with which better, reason is strict ly to do with glycol spills are very slippery. Period, end of discussion. Water wetter garbage fine for track events where you changing it out constantly. Go peddle your water wetter elsewhere.

#4674411 - 02/22/18 12:54 PM Re: run straight coolant [Re: fredly]
Gimpy1 Offline

Registered: 08/24/17
Posts: 115
Loc: Displaced Texan in Mexico City
Who's peddling water wetter, I simply stated what is allowed. Never said put water wetter in your radiator did I?

#4674416 - 02/22/18 12:58 PM Re: run straight coolant [Re: slomo]
MotoTribologist Offline

Registered: 02/03/16
Posts: 576
Loc: NJ, USA
Apparently you didn't read about how the discussion (that we were all obviously having about why water wetter is so great whistle) was ended.

No need to respond further LOL

#4674459 - 02/22/18 01:27 PM Re: run straight coolant [Re: slomo]
FordCapriDriver Offline

Registered: 10/22/15
Posts: 2441
Loc: Balearic Islands , Spain
I run premixed 20-30% coolant 80/70% water green gycol coolant in everything i own.
1975 Ford Capri II Ghia 3000 V6, - Shell Helix HX3 20W-50.
1988 Ford Escort MkIV 1.6 Xr3i Cabrio, - Comma X-Flow XS 10W-40.

#4674465 - 02/22/18 01:32 PM Re: run straight coolant [Re: FordCapriDriver]
Rand Offline

Registered: 08/20/03
Posts: 12721
Loc: NE,Ohio
Originally Posted By: FordCapriDriver
I run premixed 20-30% coolant 80/70% water green gycol coolant in everything i own.

if you use less than 30% coolant or more than 70% coolant it can cause issues

30/70 is a good compromise for hot climate.

70/30 is for best freezing protection

50/50 for most climates is great.

disclaimer I am talking about normal stuff, green,pink,red,orange,blue etc.

not including exotic "waterless coolant" etc.
2019 Jeep Cherokee Trailhawk 2.0T

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