Okay, so this year number 2. About a year and an half ago I had a coolant leak from all of the part-to-block gaskets. I fixed those. And then in December of last year I got a coolant leak from the thermostat gasket again. So I replaced it and didn’t think anything of it. It is now December again and I’m back to the same coolant leak a year later.

Both times replacing it I used Pure coolant and never mixed it with water to 50/50. So could the pressure of the pure coolant killed the gasket?

Either way it goes I have to replace it again and this time I will use 50/50. Just want to know the answer to my question though.

 

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What was the reason for not mixing the full coolant to 50/50?

water is better at cooling than radiator fluid, antifreeze is better at not freezing, would it be possible that running full concentrate meant the liquid got to higher temperatures at moments than it was intended creating more pressure, pressure looks for the weakest point to come out, and it found the same weak point as before ?

Im just babbling, hopefully someone with more experience in the subject can chime in.

 

Oh sorry man, I got it fixed and never updated. I had it as pure coolant before because I wanted to protect the system from getting rusted. And since its the 2.5L, i wasn't concerned about the heat because it has trouble staying warm anyways. So the problem was that before this leak, the radiator had a leak and my dad said to use liquid copper and pour it in the radiator. so i did and that didn't stop the leak an had to replace the Radiator. So fast forward to this leak, This was coming from the thermostat gasket and the liquid copper that was left over in the system, some of it had settled on the gasket surface and my guess is since the coolant was pure at the time it got so hot that the copper was able to transfer the heat to the gasket and just melted it from the inside. I had the same idea as you with the pressure on the gasket and figured it'd be that thermostat gasket, but when i opened up the system i saw that the gasket was only deformed where the liquid copper had set.

James