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Cadillac STS-V Series Forum Discussion, No Heat in Cadillac V-Series Forums; NO... Never mix DexCool (orange anti-freeze), with regular Ethylene Glycol (green anti-freeze). Dexcool is a no silicate based, organic acid ...
  1. #16
    CMNTMXR57 is offline Cadillac Owners Enthusiast
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    Re: No Heat

    NO... Never mix DexCool (orange anti-freeze), with regular Ethylene Glycol (green anti-freeze). Dexcool is a no silicate based, organic acid technology (OAT) anti-freeze. G-05 as used in Chrysler's and some fords if I recall, is a hybrid OAT, known as HOAT. They are not compatible.

    In order to use Ethylene Glycol (green anti-freeze), in a Dexcool equipped car, as mentioned a complete system flush (done by a machine), would need to be done.

    ----------

    Quote Originally Posted by carter's_sts View Post
    Use Dex Cool unless it's been flushed and replaced with the green stuff already.

    You can buy 50% pre-mixed Dex Cool at most auto parts stores.

    If you have a leak you should be able to smell it sometimes. When I've had even a tiny leak I've smelled it and my nose doesn't work that well.
    Actually, funny you should mention that as some Northstars with 4T80E transaxles (in the previous gen STS, Eldo's, Bonneville GXP's), would have core plug leaks. But you could never follow it by smell and on a warm, operational engine, it wasn't visible because it got burned off on the hot engine block and the exhaust cross-under pipe (they run under on those, instead of over as is usually standard on wrong wheel drive transverse applications), as it leaked. And of course, if you've been under one of those, you can't even fit your finger between the engine/pan, transaxle pan, and exhaust cross-under, so it wasn't something you just shine a light up and go "oh, there it is..."

    You had to wait until the engine completely cooled (I mean like sitting 8 hours, overnight, etc), let it drip, and then trace it back up.

  2. #17
    MoistCabbage's Avatar
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    It is perfectly ok to mix DEX-COOL with the all makes/all models "green stuff", as long as the bottle of all makes/all models coolant states that it is mixable (Prestone for instance). There is also no need for a machine flush to switch to all makes/all models coolant, the coolant just has to be mixable.

  3. #18
    CMNTMXR57 is offline Cadillac Owners Enthusiast
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    Re: No Heat

    Let me clarify. You can mix anything you want with anything you want. However, if that vehicle is under warranty, and it came in to our service department to be repaired under warranty for a cooling system related issue, and we find fluids are mixed with Dexcool that aren't meant to be Dexcool mixable (I don't care what the bottle says, I care what GM says as they're the one footing the bill), then it doesn't get covered. At that point, any cost to repair a failure is on YOUR dime. You can certainly file a claim with GM on it. You can try throwing the Magnusson-Moss act or anything else at them, but they have heard all this hook, line and sinker before.

    GM is pretty good about dotting their "i's" and crossing their "t's" when it comes to stuff like this as they generally issue licenses to Prestone, Zerex, etc, to say "Dexcool compatible" or something thereabouts. Same with oil.

    Anything labeled Dexcool compatible or similar verbage has to meet GM6277M spec BTW.

  4. #19
    carter's_sts is offline Cadillac Owners Connoisseur
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    Why would anyone risk mixing different types of coolant unless they're just too lazy or cheap to buy the right kind?

    If they are that lazy or cheap they should only own a really cheap car.

    I have bottles of both kinds in my basement for different cars.

  5. #20
    CMNTMXR57 is offline Cadillac Owners Enthusiast
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    Re: No Heat

    I've seen it done, had to deny people warranty coverage because of it. You'd be amazed at what would roll in to the shop. I can tell stories. And of course it's always GM's fault.

    Remember, the majority of people in the automotive population are retarded and cheap. They see vehicles as nothing more than appliances like their washer and dryer. They don't want to spend dime one on it after purchase because at the end of the day, it's just an appliance. So when time comes to have to repair something of theirs due to neglect and/or stupidity (and/or cheapness on top of that), stuff like this ensues. GM isn't here to protect you from your stupidity. (not you personally, just speaking in general).

  6. #21
    MoistCabbage's Avatar
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    Sorry, I was stating facts, not taking into concideration GMs excuses to cover cooling system problems under warranty. But if the warranty states you can't use anything but DEX, then use DEX.

    But FWIW, DEX-COOL is not any "better" than universal coolant, it's just different. It was originally designed to be a long life (5 year/100K) coolant. Most universal coolants are rated for that now anyway.

    It is also IN NO WAY, SHAPE, OR FORM, NECESSARY. There is nothing about the aluminum, steel, or rubber in GM engines or cooling systems that makes universal coolant unsuitable, or makes it perform any differently.

    There are PLENTY of myths about DEX-COOL, it eats gaskets, turns to sludge, causes corrosion, MUST be used, can't be mixed..... All BS.

    You CAN mix it with compatible coolants. What the box says aside, I've personally mixed compatible coolants with NO problems whatsoever, and so have many, MANY other people on this forum.

  7. #22
    CMNTMXR57 is offline Cadillac Owners Enthusiast
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    Re: No Heat

    No one here, Myself included, said it (Dexcool), was better. I for one prefer Ethylene Glycol better for it's better (or quicker), thermal transfer alone. But alas...

    And you may not like GM's "excuses" but they're the one footing the bill. If MoistCabbage's enterprises manufactured, sold, and then warrantied a product, and you specified what maintenance items were to be used in order to be covered under your warranty as the cost to repair things comes out of YOUR wallet, you're simply doing the same thing as GM. GM says use Dexcool or Dexcool licensed equivalent that meets GM6722M, or risk not having related repair covered under warranty. Pretty cut and dry to me.

    I do agree about the lawsuits issues. It isn't the coolant, it's a fault elsewhere causing an otherwise sealed system to be compromised. I post that all the time on any forum I'm on and we get into a "Dexcool..." thread.

  8. #23
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    No, nobody in this thread said DEX was better. but an above poster referred to "cheap coolant", insinuating that non DEX coolant is inferior. just wanted to clear up any possible misconceptions.

    So if Prestone has GMs blessing to produce a DEX-COOL type antifreeze, why would Prestones all makes/all models/DEX-COOL compatible coolant not be suitable?

  9. #24
    carter's_sts is offline Cadillac Owners Connoisseur
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    To clarify my post; I was not calling any coolant cheap. I didn't say that at all. You should remove the quotes. I was calling some people cheap. The assumption I was making was that a person must have one bottle of coolant to top off their systems in different makes of cars, rather than have the correct native type of coolant.

    Maybe that's a wrong assumption, but I don't understand why else someone wouldn't just put Dexcool in a GM vehicle. I don't recall either Dexcool or the green stuff costing that much.

    And I definitely was not commenting about the quality of either kind.

  10. #25
    choigilligan is offline Cadillac Owners Fanatic
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    Well I put in Dex-Cool after I noticed the coolant tank was empty late at night, only reason I asked about the green stuff was because no gas station had Dex-Cool and no auto stores were open. They only had the green stuff. But I got some at Auto Zone the next day filled her up and the heat started working again. Sweet.

    Then it stopped the next day. Checked the coolant and it was empty. FML.

    So any advise on how to check for the leak for a DIY. Or should I just bring it in to the dealership. It's out of warranty.

  11. #26
    MoistCabbage's Avatar
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    Get a cooling system pressure test kit at AutoZone, through their loan a tool program. Grab a flashlight, pressurize the system cold, and start looking around.

  12. #27
    choigilligan is offline Cadillac Owners Fanatic
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    Okay. I got the pressure checker.

    Question before I add more coolant. The supercharger coolant level is super high and when I took off the cap it overflowed. No coolant in the surge tank right now but I'm wary to add more to pressure test it.

    It wasn't like that before I added coolant to the coolant surge tank. Are these connected? Why would the coolant level in the supercharger go up?

  13. #28
    CMNTMXR57 is offline Cadillac Owners Enthusiast
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    Re: No Heat

    The intercooler's coolant system and your engine's cooling system are not connected. Two different systems

    Both use Dexcool though.

  14. #29
    choigilligan is offline Cadillac Owners Fanatic
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    Has anyone ever pressure checked their cooling system before. And if so do you do it from the coolant surge tank. Because if you do I can't get the checker to fit on it. It seem the tool from autozone only fits on radiator caps and the extra sleeves don't work either. Any advice would be appreciated.

    ----------

    Nevermind. According to the gurus at Autozone You can't pressure check this system since it doesn't have a radiator cap.

    I don't see any Dex-cool in the oil, I filled it up according to the owners manual and I'll be checking it every couple hours to see if it's leaking or if the coolant was just super low.

  15. #30
    CMNTMXR57 is offline Cadillac Owners Enthusiast
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    Re: No Heat

    The overflow tank cap IS the radiator cap for better sake of argument. There isn't a traditional radiator with cap setup due ot packaging and space constraints. The system is still a pressurized system just like any other. The issue is, their adaptors don't work on said cap for the overflow tank, but you can most certainly pressure test it with the right fitting.

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