Skip Posted January 8, 2004 Share Posted January 8, 2004 This time of year the age old question of antifreeze and it's mix ratio crops up in the northern hemisphere. I realize everyone's busy schedule prevents them from reading much but here is an excerpt any vintage Suby owner should read. copy pasted from http://www.challengers101.com/CoolantMix.html Why a rich mix gives less cooling: First of all, in this article, we refer to the stuff you buy simply as “antifreeze.” It comes under many different trade names, and for automotive applications, is usually ethylene glycol. We'll just call it “antifreeze.” Now if you've ever poured the stuff into a radiator, you no doubt observed that it is much “syrup-i-er” than water. That is, it has a much higher viscosity. This means that it will not flow as fast through the system as water, and the cooling effect will be less. Further, the specific heat of antifreeze is less than that of water. This means that for a given temperature change, the antifreeze will carry less heat each time it circulates from engine to radiator and back. So, if the mix is too rich, the cooling efficiency will be reduced because (1) the flow rate is less, and (2) less heat is transferred per cycle of the coolant. _________________________ also for your reading http://www.carcarecouncil.org/Cooling_System/antifreeze.shtml I doubt very highly if you have read this far, but with the cooling issues so many of us have.......... long since forgotten as summer has been over for several months, this could be something to remember come June. For those that have followed along, I thank you for your attention and Remember to use distilled H20. Link to comment Share on other sites More sharing options...
Setright Posted January 8, 2004 Share Posted January 8, 2004 Couldn't agree more. The only trouble is convincing people of these facts. Glycol has a Specific Heat Capacity of 2.6 Kilojoules per degree per kilogram Water has a SHC of 4.2 KJ/C/Kg Only certain ammonias have a higher SHC, but these are unsuited for cooling. Water is the winner! Link to comment Share on other sites More sharing options...
Skip Posted January 8, 2004 Author Share Posted January 8, 2004 Thank you very much Setright We should add that water has excellent thermal transfer properties also Thermal Conductivity water = 0.60 Watt/m · °C vs Glycol at 0.25 Watt/m.°C But alas you are correct when you say "The only trouble is convincing people of these facts." More excellent reading at http://www.redlineoil.com/redlineoil/wwti.htm Thanks again for your suuport. Link to comment Share on other sites More sharing options...
Soobadooba Posted January 8, 2004 Share Posted January 8, 2004 And if that ain't enough to convince people, maybe the idea that the heater won't work as well with a rich mix will (directed at people in cold climates). Cold tootsies=bad -Louis- '91 Loyale 4wd 5spd Wagon Link to comment Share on other sites More sharing options...
beauregaardhooligan Posted January 8, 2004 Share Posted January 8, 2004 I would like to take this opportunity to remind everyone that anti-freeze is extremely toxic to our furred friends. Dogs especially, but cats also like the sweet taste and will lick it up off the ground, so *be sure* to wash any puddles away. It causes their kidneys to shut down and they die a long, painful death. . Link to comment Share on other sites More sharing options...
Meeky Moose Posted January 8, 2004 Share Posted January 8, 2004 well i don't know much about the cooling properties of water/antifreeze.. but i can say when i buy antifreeze for my cars, i always use the prestone 50/50 mix stuff.. its always served my purposes well.. and its cheaper and ya don't have to figure out the mix yourself.. Link to comment Share on other sites More sharing options...
Adam N.D.J. Posted January 8, 2004 Share Posted January 8, 2004 I always use a mix of 25% antifreeze to 75% water. Winters round here don't go much below 30, so it's still protected from freezing, but the cooling (and heating) are much better. I acidentially put in over 50% AF in one of my cars, and the heater almost didn't heat at all. I've worked on cars that the coolant was neon green (way too rich), it should just be slightly green, and definatly not neon to work in it's best capacity. Link to comment Share on other sites More sharing options...
MaroonDuneDoom Posted January 8, 2004 Share Posted January 8, 2004 i bought some specialty prestone or some other name brand anti-freeze that is orange. it's specially formulated for aluminum engines. Link to comment Share on other sites More sharing options...
Partsman Posted January 9, 2004 Share Posted January 9, 2004 I personally wouldn't want to go much below a 50/50 mix for this reason - CORROSION INHIBITORS! They keep your passages from becoming swiss cheese. That's why you need to remove and replace your coolant every 2 years - the inhibitors break down. Adam N.D.J., I run 50%, temps here rarely get below 30 as well, and my heater works fine - maybe you have another problem, such as rust clogging your heater core! Link to comment Share on other sites More sharing options...
Partsman Posted January 9, 2004 Share Posted January 9, 2004 MaroonDuneDoom - Orange antifreeze is extended life coolant developed for GM, called DexCool. Green coolant is also "especially formulated for aluminum engines." I saw several GM trucks come into the shop I worked at with rust plugs at the filler neck because they didn't have quite enough DexCool put in at the factory and the upper radiators rusted badly. Don't pay extra for stuff you don't need! Link to comment Share on other sites More sharing options...
MaroonDuneDoom Posted January 9, 2004 Share Posted January 9, 2004 my mistake, i thought it was especcially for alluminum engines. either way it didn't cost me anymore. it was the same price as one of those or two premixed. plus it looks "high-tech". lol:D Link to comment Share on other sites More sharing options...
Setright Posted January 9, 2004 Share Posted January 9, 2004 I would support anyone who suggests that 25% "antifreeze" is enough to prevent the cooling system from corroding. This is like the oil discussion: The most important thing is that you replace it at the correct interval. This is personal from car to car, because use and mileage vary vastly. I do one cold-start a day. The rest of the day, the car is never stationary long enough to cool back down, and this means less condensation problems, and longer oil life. The coolant is also less stressed, because it is not cycled from cold to hot all the time, but remains at a fairly constant temp. IMHO Link to comment Share on other sites More sharing options...
Snowman Posted January 9, 2004 Share Posted January 9, 2004 MDD: WHOAH! WAIT! STOP! Putting orange coolant in your subaru at this point is NOT a good idea. Unless the manufacturer specifies a certain coolant, just use the green stuff. And definitely don't switch from green to orange at this point unless you get absolutely all of the green stuff out first. ANY mixing is really bad. Orange or red coolants are specially formulated for specific types of metals, or systems that use two dissimilar metals, or whatever. The best coolant for your subaru is green. Link to comment Share on other sites More sharing options...
Skip Posted January 9, 2004 Author Share Posted January 9, 2004 I thank you all for your comments. I have a nasty habit of reading a lot, applying proper filters and watching for repeated quotes. Here is what I have found in reference to the above statements With DEX-COOL®, the maximum ratio of antifreeze to water is 60/40. Although DEX-COOL® type antifreeze can be mixed with standard ethylene glycol antifreeze, DEX-COOL® loses its 5 yr./150,000 life. As such, it?s best not to mix antifreeze types unless absolutely necessary. All coolants must be diluted with water at the proper ratios and should not be used full-strength. Full-strength antifreeze actually has a lower freeze point than when mixed with water. Generally, standard ethylene glycol type antifreeze should be changed every two years or 24,000 miles. CORROSION PROTECTION Acid neutralization capability is very important. Coolant which has been left in a cooling system for several years has probably become acidic from the oxidation of the glycol to acids. Also, keeping the glycol concentration in the cooling system below 50% will help stability. Once again I thank you all for your comments. Link to comment Share on other sites More sharing options...
GeneralDisorder Posted January 9, 2004 Share Posted January 9, 2004 As for corrosion inhibitors - there's zinc in the anitfreeze. Anytime you have two dissimilar metals and a liquid you have a battery...... the zinc attracts the corrosive properties of the battery effect so as not to ruin the soft aluminium. For this reason, the green style stuff should be replaced every other year EVEN if it tests good with a hydrometer, as the zinc will be gone by this time - they put zinc plates on outboard motors, and large ships with steel hulls for this same reason..... GD Link to comment Share on other sites More sharing options...
MaroonDuneDoom Posted January 9, 2004 Share Posted January 9, 2004 a little late for me. i don't think it will hurt anything though. i accidentally put it in full strenghth and ran it for about a week because the guy who sold me on it told me that it was premix when i asked. i didn't even bother to look and verify. whoops. Link to comment Share on other sites More sharing options...
Partsman Posted January 10, 2004 Share Posted January 10, 2004 Skip - Nice VOICE OF GOD post there, bro! However, extended life antifreeze actually has a maximum recommended mix ratio of 70/30 (I'm looking at the back of a bottle of Zerex and a bottle of Prestone). At that ratio, you are protected down to -84 degrees and up to 276 degrees - from that ratio up, you go down in temperature as you stated. Incidentally, standard antifreeze has the exact same mix ratio and temperature maximum/minimums. GD - I pulled up MSDS's on antifreeze and cannot find any mention of zinc in antifreeze. They have some complex chemicals that do what you stated, but no zinc. Setright - I think, over time, if you are only running 25% mix, you are going to corrode your radiator, water pump, and coolant passages. Maybe not too soon, but eventually. Link to comment Share on other sites More sharing options...
archemitis Posted January 10, 2004 Share Posted January 10, 2004 hey slacker partsman. get back to work and reading those napa books. NOTICE skip says always use distilled h20 thats because its got no minerals and chemicals like tap water. only minerals will hurt your cooling system, not water. Link to comment Share on other sites More sharing options...
Erik R Posted January 12, 2004 Share Posted January 12, 2004 This is a good thread. It made me buy a hydrometer and check the specific gravity of my coolant. I had waaaaaaaaay too much "prestone".............It was probably 95/5 . I went to Safeway and picked up some distilled water, opened the drain and let out some coolant, topped it up with distilled and ran the engine for a few minutes to circulate the coolant. I had to do this twice before I got it down to 50/50 mix............. Oh, the heater really cranks now.......... Link to comment Share on other sites More sharing options...
Erik R Posted January 12, 2004 Share Posted January 12, 2004 I drained the coolant responsibly..............no animals will be harmed. Link to comment Share on other sites More sharing options...
MaroonDuneDoom Posted January 12, 2004 Share Posted January 12, 2004 it's amazing how well the heater works with proper coolant levels isn't it? i was mistakenly running 100% anti-freeze for about a week. last time i take some parts guy's word. oh yeah, i used regular, run of the mill tap water. i just don't want to bother with the price of water. i have a new radiator and i should have started on the right track, but my car is a beater and i don't like to go overboard. i'm kinda in the market for a new car. i have some bills that i should pay and don't really need a new car, but i really want another sube. Link to comment Share on other sites More sharing options...
Ma-fia Posted January 12, 2004 Share Posted January 12, 2004 Originally posted by Skip I have a nasty habit of reading a lot, --- I think it is a very good habit. Just don't forget to share your findings with us general public! By the way, one of the sites you posted has another very valuable fiture: Vin Identificator http://www.carcarecouncil.org/stats.shtml For quite a while I was wondering what the heck my parts car was -- one dealership told me one thing, another -- another thing, tax office the same as 1st dealer, so ... Now I have a definite answer. Suppose this link would be worth posting in a separate thread?.. Link to comment Share on other sites More sharing options...
Skip Posted January 12, 2004 Author Share Posted January 12, 2004 Why thanks Ma. And taking your sugg. is why I created this thread. That site has a wealth of info for us car nutz. Did ya peek at the DIY tool section? http://www.carcarecouncil.org/DIY_tools.shtml Nice list of emerg. eq. there. That could be a thread on it's own. Something like that was on the "Off Topic" board I believe. Link to comment Share on other sites More sharing options...
Erik R Posted January 12, 2004 Share Posted January 12, 2004 Only cost me 78 cents..............and was 2 for one at that..... Link to comment Share on other sites More sharing options...
Meeky Moose Posted January 12, 2004 Share Posted January 12, 2004 still isn't it easier to buy the 50/50 mix prestone?? rather than filling, draining, mixing, draining, refilling, etc.. and ya don't have to pay more for the plain prestone then buy water.. the 50/50 premix is cheaper than the straight stuff.. just my .02 not that its amounts to much... Link to comment Share on other sites More sharing options...
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