It sounds like a head gasket, and the hiss is a vacuum leak(mostlikely) while at idle, your not pushing enough coolant through the system, when you hit the gas, the waterpump pushes the coolant even faster, thus pushing it past the gasket. However, you say the his sounds like its coming from the under the drivers door, lets hope that you just have a hole in the vacuum hose to the transmission and its causing some of the fluid to suck into the combustion chamber, much less of a problem, but you will need someone to look. As far as the head gasket, thats gonna cost you, probably around 800.00. Depending on where you go, so get a second and third opinion.
Monday, February 22nd, 2010 AT 4:34 PM