Ron, click the link in my post. The page also shows the partial routing for an ES. Interestingly the 1800 does have a pipe out of the back of the matrix which comes out behind the fan housing. The short right angle hose for that goes to the lower tube on the heater valve. The long hose that goes back to the outside pipe that goes back to the pump goes on the top fitting on the valve. Valve is different on the 1800 and has the in/out coming out of the side of a vertical tube. If you don't have an 1800 parts book I will do a screen grab from the one I have downloaded onto my PC.
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