87 4kq coolant reservoir cap bad?

[Cade Carvell]

Well,
  I looked closer today.  It appears that I have also cracked the
resevoir tank.  I just placed an order with BLAUfergnügen, should have
my new tank Tuesday I hope....

Thanks to All,


Cade Carvell
National Business Systems, Inc.
2919 West Service Road
Eagan, MN 55121
Office: 651-994-4400
>>> Brett Dikeman <brett at cloud9.net> 04/19/03 21:33 PM >>>
At 11:16 PM -0700 4/18/03, auditude at cox.net wrote:

>Once the cap pops, it has to be replaced.  It's like a fuse that way.

Yeah- for some reason, they never seem to seal right after they've gone.

>   You should be able to get a new one anywhere, but especially at an
>import parts place.

Why?  The dealer charges barely $10.


>I don't know if there are different pressures, but if you spec one
>for the car yoReceived: from GWDO_ICORP-MTA by aaoffc01.questau should be fine.

The cap on my car(blue, like the old one) is from the VW parts
department, and I matched part numbers- they're all the same AFAIK.

>I'm wondering if you had a different problem that caused it to boil
over


Nah.  Overfilling the tank would cause it to pop...you've -got- to
have some air to provide room for the coolant to expand.  If there
isn't enough air, that doesn't change the volume the water needs to
expand when it gets hot, and you will overpressurize the tank.  When
the cap releases, you'll get a surge from hoses etc contracting, and
then a boilover from the coolant's boiling point dropping suddenly
due to no pressure :-)

B
--
----
"They that give up essential liberty to obtain temporary
safety deserve neither liberty nor safety." - Ben Frank
lin
http://www.users.cloud9.net/~brett/