[Vwdiesel] thermostats.

Roger Brown r.c.brown at ieee.org
Tue Nov 11 12:12:49 EST 2003

cass wrote:
> hi kids...
> so..i was just curious...
> why do some thermostats last seemingly forever and some not?
> (ones attached to waterpump)
> i had just replaced my thermo when i rebuilt the motor last year..
> now it is stuck shut.
> ive had them work for years,then slowly get old and tired..and not work efficiently anymore,( gawd..sounds like me  :o/   )
> but why do they sometimes just get stuck shut.?
> not last very long?
> seems nothing was obstructing the spring...
> car hasn't been run dry or over heated..
> nice diesel antifreeze in it.
> any wisdom on this ? :o)

Probably brand more than anything.  I don't think I've ever had one fail in 3 VWs w/ 200K+ miles total on them, assume these were OEM t-stats in all cases.


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