I hear water running under my dash broad every once in a while. Can someone tell me what causes that.

Asked by Jan 25, 2013 at 11:50 AM about the 2005 Pontiac Grand Prix GTP

Question type: Maintenance & Repair

2 Answers

Possibly you are hearing water flowing in to the heater core. If you hear it when you turn the heater on, and at no other time that is almost certainly it

Best Answer Mark helpful
102,855

Check your coolant level. Bleed the air out of the cooling system. If you are using coolant, look at the passenger end of the V6 lower intake manifold for a leak. It's a $600-$800 repair that is fairly common with Pontiac V6's that have 60-80K miles.

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