Rick's Free Auto Repair Advice

Water pump leak

Water pump leak

Stop water pump leaks by using only the factory antifreeze

For decades we all used the green coolant. It worked well as long as we changed it at least once every 2 years or 24,000 miles. The ethylene glycol helped dissipate heat better than water alone, and it prevented freezing in the winter. water pump, coolant, HOAT, OAT, DexCoolIt also had some really important additives. First, it contained a water pump lubricant to keep the two rotating carbon seals inside the water running smoothly. The coolant was also loaded with silicates. The silicates performed a very important function by depositing a “passivating” coating on all cooling system parts. The passivating coating literally disabled the electrolysis action that always occurs when you have two dissimilar metals connected by an electrolyte—in this case, the coolant. The silicate formulas worked well when our engines were made out of cast iron and the radiators and heater cores were made out of copper.

But today’s engines are made out of aluminum alloys, as are the radiators. Other engine components are made out of magnesium and steel. Car makers discovered that the green silicate formulas didn’t do as good a job at preventing electrolysis in those situations. So they changed to Organic Acid Technology (OAT), Hybrid Organic Acid Technology (HOAT), and low silicate formulations. The new coolants provide much longer term electrolysis protection.

What’s important for you to know is that when they changed passivating, coolantto those formulations, they also changed the composition of critical engine seals, like the seal inside the water pump and intake gaskets. Silicate is very abrasive. So, if you replace OAT, HOAT, or low silicate coolant with the old green stuff, you risk early failure of your water pump and other engine seals. Don’t do it!!

Stick with your car maker’s recommendations. Contrary to claims by coolant manufacturers, there is no such thing as a universal replacement coolant. Toyota and Honda owners should buy their coolant directly from the dealer. GM’s Dex-Cool is available at most auto parts stores. (I’m not going to get into the discussion about Dex-Cool. There are pros and cons to each argument and I’m simply not convinced that the alleged problems associated with Dex-Cool are caused by Dex-Cool itself. There’s evidence of misuse and defective gasket designs that go way beyond the Dex-Cool issue itself)

© 2012 Rick Muscoplat

Posted on by Rick Muscoplat

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