Hi guyIs: Appreciate all the replys. Also sorry for the delay in answering. I'm about 8 hours ahead of you guys in the states. I believe the comment about over tightening might be on the spot. Today when I went to work, I park in an underground garage. Before parking I covered the area under the motor with paper towels. When I drove off several hours later the towels were dry and spotless. I did use regular hose clamps for the two plastic nipples coming out of the firewall from the heater core, and I probably over tightened them. I will check for sure this weekend. The thermostat housing shoul