Just had the water pump, et al, changed out on my 98.5 A4Q 2.8 for the
second time. The factory stuff I changed at 63k out of caution, this
stuff was just replaced because the water pump was beginning to fail
after only 47k miles. What would cause this to happen? I'm just
happy my mechanic caught it after I brought the car in for new tires
and asked him to check a hesitation on acceleration that had just
started a few days earlier in the week.
Incredible. What's interesting about this situation for me was that
the second thermostat (the one that was changed out for the factory
one and just replaced this time along with the failing water pump)
never consistently registered a rock solid noon hashmark reading. It
would wander one or two hashmarks high over the course of driving, and
that always made me nervous. I wonder if that was a harbinger, but
this went on for years. I'll be curious as to whether this new
(third) thermostat is more consistent.
That makes perfect sense; the water pump bearings were starting to go,
and it was making noise, which is how the mechanics detected it. These
mechanics are not the ones who installed the failed water pump, and
I'm confident they've installed the new one and associated tensioner
pulleys and timing belt correctly. Car still drives great; I'm happy
to have it back.
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