On my 2004 Trailblazer LT 4.2L, I noticed coolant leaking from the cap area. Thinking it was a loose hose I tightened it and it will still leak in cold weather. I took a chance and bought this radiator cap, compared and found that the o-ring on the underside of the old one's cap was flat and almost flush with the inner cap. The new lid was nice and round and closed perfectly. no more leaks! repair cheaply.
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