when the EGR went out i had no clue until my check engine light (AKA THE DEVIL)came on. But the water pump..my temp gauge started acting real funny...moving up and down quite a bit...plus u could see the radiator fluid starting to leak a lil...one thing i have noticed is that past 100K the 3.1's "drink" alot more fluids than the 3.8's do ...example: oil, radiator, trans...etc... but the are still very very dependable overall.....
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