Originally Posted by Brian Carlton

Very good.

So, we know that we can get the desired results with a vacuum adjustment.

Now, I'm not personally familiar with the 616, but we need to determine if the VCV on the IP is adjustable.

Please look at the VCV and tell me if it has a small domed cover on the forward end (closest to the radiator). The domed cover will be facing the left side of the vehicle (facing you when you're looking in there).

Nothing needs to be done with the modulator and nothing needs to be done with the 3/2 valves............just get that out of your mind completely and don't touch anything else.