I'm trying to increase the cooling of my A/C. This truck doesn't use a water valve but blend doors instead to separate heat from cool. There still is a fair amount of heat given off by the heater core when the temp dial is set to cold, you can even feel it in the center console lower storage pocket.

I'm looking to install a water valve to cancel the hot water flow to the core. As you know there are two heater core hoses going through the firewall. Facing the engine the hose entering on the right comes off a flange fitting on top of the engine and the one entering on the left is connected to the pipe that is o-ringed connected to the back of the water pump. As well each heater connection to the hoses has a by-pass that diverts some hot water to the throttle body - which I don't want to interrupt.

It appears that flow direction is from the flange fitting to the core, out of the core and to the pipe that fits into the back of the water pump.

I would prefer to install the water valve on the inlet to the core (right side hose), but that hose is behind the hose that outflows water from the core and therefore not accessible. It looks like I can use a water valve on the outflow flow from the core and still not interfere with flow to the throttle valve.

Are my findings and assumptions correct? Does anyone see any possible problems? Thanks.