coolant loss/auxilliary water pump

Kneale Brownson knotnook at
Fri Feb 18 18:03:04 EST 2005

This has been the common failure mode for the pump, according to previous
reports here.  Kind of like the splitting apart of the heater valves.
You're lucky you found it before it became an empty-the-system failure on
the highway.  

At 10:19 AM 2/18/2005 -0500, Phil Rose wrote:
>A few days ago in a thread about coolant-level warnings, I mentioned 
>that my car had recently started to have significant  coolant loss. 
>After studying the tell-tale signs it became obvious that the source 
>(or _a_ source) was seepage from the auxilliary (after-run) water 
>pump. Fortunately I had a new pump on hand, and the replacement was 
>about the easiest job I've ever done on this car. About 10 minutes.
>When I examined the old pump, I expected there to be some evidence of 
>"cracking" in the plastic housing --somewhere near the hose nipples. 
>I pulled on the nipples (ouch!) anticipating that one of them might 
>snap off--but no. What happened was that the entire pump housing 
>separated from the motor. So it appears that the seepage was from the 
>"joint" between the plastic housing and the metal pump. Is this 
>typical? I expected the sort of stress crack as in the radiator 
>nipple failure mode. Anyway, I expect that the old pump was the 
>original, in which case the failure came at about 150K miles. That's 
>one less component to worry about now--until 300K comes along :-)
>Phil Rose
>Rochester, NY
>mailto:pjrose at
>200q20v mailing list

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