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Anytime I do a coolant system repair I let it sit and run with the cap off for a good half hour so that it has time to work the air out

I had the same issue on a junk ej22e. But mine was an issue that the previous owner I stalled a lightweight aluminum crank pulley an it oxidized to the bolt. The acetone and ATF mixture finally freed...

Instead of using conventional penetrating lubricants try this: in an empty spray bottle mix half acetone and half auto trans fluid. This mixture tends to have stronger rust eating properties because...