Coolant leaks--93 940 Wagon
 

Lost all coolant from my 93 Volvo 940. The leak is comming from the rear of the engine between it and the firewall--middle and going down the block. I have replaced the 2 heater hoses a couple of years ago. They look fine as well as the vacuum coolant valve. All were replaced at the same time. Clamps are tight. I can't see where the leak is comming from because of all the hoses etc. Is there a 3rd hose back there? Does anyone have a Volvo (not aftermarket book) schematic of that area so I can see what's back there? I see there is a metal pipe from the water pump to the rear of the block, but that clamp looks tight as it coimes from the valve.
Thanks