Those of you with multiple water pump failures

[Perfectlap]

You're correct and that prompted me to go through my notes. I had the coolant tank replaced two years ago. and in looking that up it turns out I've had this sudden drop/bubble before, the first time I did a coolant flush after the car was 10 years old, or a year before the old coolant tank split. Seems like each time the cap is taken off the coolant tank, I end up with a drop in coolant some time later. First time was the flush and recently with the waterpump. I still have the car's original 2000 cap....

I'm not sure if this is a factor related to the cap issue, but both drops in coolant seemed to occurr when ambient air was hot (over 90F) and I was driving the car around for at least an hour.

[woodsman]

Perfectlap: the coolant went just below the low mark and then I had it topped up. This occurred in a few days and hasn't moved since.

[pothole]

Hmmm, I ahven't had to top up my coolant since I DIY'ed the pump and both rads 30k miles ago.

I didn't do anything clever, but I did follow the bleeding routine from (I think) Pelican Parts to the letter. Sure it's a little long winded, but it's not that bad.

Can only go on my experience and my experience is that you don't need fancy equipment.

[clickman]

Originally Posted by Perfectlap

I still have the car's original 2000 cap....

I'm not sure if this is a factor related to the cap issue, but both drops in coolant seemed to occurr when ambient air was hot (over 90F) and I was driving the car around for at least an hour.

From my recollection of the issue it could be your cap. Why not replace it with the updated version - they're cheap.