Well currently with the temp wheel set to "max" its blowing heat, so by taking the wires off it should be simulating "max" by having an open circuit..no ground.
Running the car to get it warm, all 4 hoses became warm at about the same time.

So, I decided to hook up the voltmeter to the wires with them unplugged.
Putting the negative terminal on the ground wire and the positive on the red/black wire, it reads 12volts with the wheel set to "max" ?? Shouldn't "max" give you an open circuit therefore the meter should have read 0v ??

This is making no sense now since it got hot and blows heat with the wires unplugged, and it also blows heat with the wires plugged in and they are feeding 12v to the valve since it appears to be grounded when on "max".

With the temp wheel set to anything lower than "max", the voltage switches on and off every few seconds giving you 12v then 0 v then 12v then 0v again on the voltmeter, which I think is correct as it regulates how much hot water makes it to the heater core that way right?

__________________
Rob

'87 560SL
'87 Buick Grand National
'79, '89', 99' Anniversary Trans Ams