Jim, this tip about lowering valve assembly is brilliant!  Yeah, that valve is WAY up high...and your arms are aching...your brain is exploding.  Your method is far superior.

>> 
>> The swap out operation is almost trivial. Don’t try to work with your 
>> hands up in the valve cavity lying on your back. Drop the glovebox and 
>> remove the two heater hose connections from the heater core. Pinch off 
>> the hoses with harbor freight hose clamps so you don’t lose coolant. 
>> Lower the whole valve assembly to the driveway and work on it there, 
>> then draw the hoses back up and reconnect to the heater core.