In a message dated 11/23/2002 11:09:31 PM US Eastern Standard Time,
eanderson@carolina.rr.com writes:

> This is interesting.  I have my coolant pressure gauge after the evaporator
>  cores and my pressure decreases by around 5-7 psi when I go from idle to
>  5500 rpm.
>  
>  Ed Anderson
>  
Your gage is on the suction side of the loop. The engine and the cores being
the restriction. Lynn E. Hanover