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Originally Posted by odie
300TD, 617 engine I think...
HOWEVER, I disconnected the hose at the fire wall and ran the engine. No water flows out of this hose at idle. I have to rev the engine before any water will flow. as soon as I return to idle the water flow stops. 
Is this normal? |
That is why the car has an aux water pump-to ensure flow at idle. But when you disconnect the hose at the block, flow through the heater plumbing is eliminated, and the aux pump will go dry. Assuming that it works, of course.