If you check your coolant regularly; maintain the proper coolant level
and make sure that the radiator cap is the proper type and is
functioning properly, you shouldn't have any problems. Many GM dealers
are now advising customers to have a flush & fill done on DexCool
systems at the 5 yr/50,000 mile mark.
The problem with those engines begins with impurities in the coolant
that cause corrosion on the intake gaskets which in turn causes them to
leak. Watch for "gunk" to form on the inside of the radiator cap and in
the coolant recovery tank and if you see this, take it to a dealer ASAP
to have the system flushed and clean DexCool re-installed.
Some people will tell you to flush the system and replace it with
regular anti-freeze - DON'T. If you do this, you must be absolutely
certain that you remove every trace of DexCool from the system or you
will only create a problem where none may have existed before.
There are two classes of pedestrians in these days of reckless motor
traffic - the quick and the dead.
~ Lord Dewar 1933 ~
Climbing into a hot car is like buckling on a pistol. It is the great
equalizer. ~ Henry G. Felsen 1964 ~
not quite enough. Ours had to be replaced well before 50k and I checked the
coolant level at least every other weekend and topped off as needed. That
is how I first noticed the leaking, I had to add coolant a couple times so
I knew it was going somewhere.
Not true in our case. Our 2002 Olds' intake manifold gasket failed at 44k
miles, and I had been careful to keep it topped up with DexCool. GM
replaced it under the MajorGuard extended warranty.
These failures are not all, or even mostly, neglect related.
My 99 Century with 59,000 miles on it had the coolant level (cold)
drop about 3/16" below cold line, but appeared to be clean. When I
removed the cap, the level was down a couple of inches, and there was
muddy goop around the neck of the filler. I suspected that a gasket
leak might prevent the vacuum from pulling enough coolant back as
the engine cooled. (I had never added any coolant).
I had 75-month, 7-yr extended warranty, but always "never seemed
to apply", so I was expecting to be disappointed again.....but when I
mentioned that I was aware of the horror stories on the web, and
reminded them that they might end up putting in a new engine, they
agreed to do the job on the intake-manifold gasket etc, but they still
managed to charge an additional $200. I thought everything should
have come with the job, except that the warranty might have been
$100 deductible. (This was at the Buick dealer).
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