Drain the coolant, disconnect the surge tank to heater pipe line, and the heater core to heater pipe line, remove the drivers side engine mount, and the starter, and unbolt the heater pipe from the engine-transmission bolt. Remove the clamp from the short hose at the thermostat housing, and pull the pipe out. It will take some finageling to get it out from under the car, but its not hard to pull out. Much simpler than it sounds. It is a tight fit.
Sounds like a bad flex joint on your exhaust, pretty common for older cars. A new flex joint can be welded in to replace the old one.
Last edited by Daytrepper; 10-11-2010 at 09:06 PM.