I need to have the head gasket replaced on my '97. It's weeping underneath the thermostat housing while driving normally. It sprays a fine mist where the t. housing mates up to the head, when towing a heavy load. (Down the side of the engine covering the the heater hoses and head) I have called M&D, but they are extremely busy and can't get to it until next week. I had to leave a message at Cummins Southern Plains, and no one has called me back. Any other ideas?