In Reply to: Re: Heating Problem (Revisited) posted by Neepu on January 27, 2000 at 19:52:39:
I have to admit I'm stumped. As I don't have access to a 540 I'm at a dead end here.
With the engine running there was no pressure in the hose? Does it indeed come off the radiator top hose? Hard to imagine there could be blockage.
Could they have left a sensor disconnected when they replaced the block? Look through the wiring diagram to see if there is a valve or solenoid that completely cuts coolant flow off. I think on my car there is a switch click when the temp knob is turned all the way down which is supposed to disable climate control and therefore coolant flow to the core.