Just replaced the heater hose that goes to the heat control valve. The cable on the valve moves with the dash control works but no heat and the hose at the valve end doesn't get hot - either a bad valve or pluged heater. This is in south Florida so I would just like to bypass the heater and route the coolant back to the block. There are several hoses that seem to come back from the passenger compartment. Does anyone have a diagram showing which is the return hose? Also what is the diameter of the return hose?