Look on the bottom of the passenger side tank, on the back. I don't recommend using it. On newer models we had a lot of trouble with them sealing once they were opened. The problem was not the o-ring on the stem. It was the plastic housing the o-ring sealed against would crack and cause a drip about once every ten seconds. The fix was a new radiator. I pull the lower hose off instead.

Answered by caradiodoc (expert)
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