Thomas, Hooking up your heater hoses wrong won't cause the engine to overheat. It will cause cooler than usual water to enter the heater core so heater output will be diminished. Check your thermostat -- you may have dislodged some debris when you did the work. Pete in PA From: TJen486582@xxxxxxx Date: Sun, 17 Feb 2002 22:36:06 EST Subject: Re: IML: '61 cooling system problem.... Reply-To: mailing-list@xxxxxxxxxxxxxxxx Hey all! So I get this car with the heating system disconnected. The water pump was looped back on itself and the heater core was looped back on itself. It was summer, so who needed heat anyway. So now comes winter and it is COLD! I decide it is about time to reconnect the heating system. After a very long search for a new heater control valve and a lot of support from Denis I finally get the long awaited item. Pulled out the glove box removed the old heater control valve and put in the new one. Hook up all new hoses, fill up the system with coolant and prepare for the final test. Start up the 'ol girl and lo and behold in a few short minutes I have heat...Oh Wonders!!! So I decide to let her warm up and I notice that the temperature gauge is steadily climbing to the max. Now this car has always run cooler than normal. I shut her down and coolant is spewing out of the overflow and the two water pump connections. I'm thinking maybe the hoses are connected backwards. I go back to the FSM...where I started from to recheck the connections...of course the picture they show is from a '60 heater core and they don't show the connections at the water pump. So, after this long drawn out story can someone tell me which hose goes to where??? Overheating in LA! Thanks, Thomas 1961 LeBaron