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Re: What is water pump flowrate for an in-spec pump?
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Posted by Scott McCrary [Email] (more from Scott McCrary) on Wed, 28 May 2003 06:43:30 Share Post by Email
In Reply to: Re: What is water pump flowrate for an in-spec pump?, Sjer, Tue, 27 May 2003 09:40:26
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Update: I'm now in the midst of using a heavy-duty (3-6 hour type) Xerex radiator flush but I don't think that's going to do it, as I flushed it less than two years ago. My radiator core exterior is very clean and free from bugs/debris. The car has an 82 degree t'stat installed about 10k ago, which seems to be working fine, as noted in my test. (Small chance that it's opening part way, I guess...but my problem with cooling has been incremental over two years, not a step-change).

I suspect the pump only because I have had even cast iron impellers wear before on other cars (e.g. Volvos), and I agree with Patrick that it's probably radiator or water pump.

I'm going to repeat my flowrate test on my '98 9000 CSE (50k miles), being sure to pinch off the heater core supply hose (suggestion inferred from BobS's comments). I suspect I'll find it flows more than the '91's 1 gpm or so.

I do think I have a classic case of inadequate net cooling capacity, though- I can vary the gauge up very predictably by adding load (going up long hills), down predictably by offering additional cooling thru the heater core, and up/down driving in different ambient temperatures, etc.

I've read enough TSN posts to realize that this is a fairly common 9000 problem as the cars age.

posted by 208.15.4...

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