![]() If there's no gauge indication the coolant is low, odds are it won't be topped off. I feel this is a major contributing factor to why things happen the way they do. There was never a "low coolant" indication until the coolant level was really low (like half quantity) which I experienced personally on the several occasions the corroded expansion plugs would let go. However.I've never seen any other brand of coolant do the damage Dexcool does when it's not topped off. I'm certain the coolant level was low while the truck was owned by someone else. ![]() Now, finally, all the gunk is gone and it works fine. I bought a used '94 S-10 that had been serviced (naturally) just before I purchased it.ĭue to the sludge buildup in the 2.2, I have since replaced (in order):Įvery expansion plug (including the one between engine/trans) Once again this is just what I have seen day in day out in a GM dealer and there are millions of dexcool equipped cars out there that never have a problem. GM vehicles have had waterpump and intake manifold leak issues long before 96 when dexcool was introduced - anyone who has worked in a garage for any length of time can probably change a small block waterpump with their eyes closed and those things have been failing since the 50's! People often say that the deposits left by dexcool are what causes the waterpump and intake gasket leaks on GM vehicles but it would seem to me that it is the other way around - the leaks cause the buildups. If you stop and check your level and just top it up (because a/f always goes low without a reason right?) that residue will mix with the coolant and turn sludgy, this starts to transfer that through the cooling system and starts pluggin things up. When a vehicle has been driven with a low coolant level that contains dex-cool it leaves a grainy rust like deposit in the upper areas of the rad that have been without coolant for any length of time. The reason they tell you not to mix green a/f with dex-cool is because it takes away the "long life" rating of the dexcool coolant.Īs far as the suits and consumer complaints about dex-cool I'll tell you what I have seen in the shop. The coolant that actually turned hard and to a gel when mixed with green a/f wasnt the orange or pink(depending on if its used or new sometimes it looks pink) dexcool but with the red stuff that alot of the imports had in them in the 90s. It isnt gonna turn to glue or cause trolls to bread in your cooling system. Dex cool has had alot of s#%t thrown around about it lately and I do agree it isnt better than green a/f but in a beater truck that isnt a big deal I wouldnt bother flushing it out. I've been a GM tech for about a decade and I never claim to be an expert on anything but I'll try and shed a little light on this one if I can.
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