My 96 Mercury Grand Marquis is making a water rushing noise just behind the dashboard on the passenger side. I was told it could mean that the Heater box drain is plugged but I cannot find a drain. Can anyone advise?
Loud water rushing sound behind the passenger side dashboard when accelerating. Not sure what is causing it but I do not have water in the vehichle. I Was told it may be a clogged Heater box drain but cannot find the drain to clean out.
