water

Asked by Dec 03, 2010 at 07:42 PM about the 2007 Pontiac Grand Prix GT

Question type: Maintenance & Repair

i just bought a 2007 grand prix gt. when i warm the car up, a puddle of water (not huge) forms on the pavement under each of the mufflers. is this a bad thing? and what is causing it?

2 Answers

12,425

Normal operation of the catalytic converters, converts the green house gasses to water. You are seeing this water drain from the drain holes on the muffler to keep them from rotting from the inside out because of this chemical reaction.

right on. thanks a lot. good to know

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