I did do a block test with a block testing kit, fluid didnt change color. Also the only time it starts to overheat is at idle with the ac on, otherwise it seems to be able to keep normal temps. One other symptom i noticed is that when it gets to higher temps i get a little bit of tapping that seems to switch between the 5th and 6th cylinder, when i rev the engine the tapping stops, it stays quiet for a little bit after i let off but then returns shortly almost like coolant is not flowing enough through those cylinders to keep them within their temperature spec
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