sure you can verify this with a test, pull the coil connector and connect
shop air to each cyl one at a time with the radiator cap off, crank the
engine and you will see the coolant blow back thru the radiator, this will
indicate a blown gasket/cracked head, normally cyl 3 and 4 are the faulty
ones if the head is warped, but check all cyl's the coolant passages may be
blown into the combustion sytem

Glenn Beasley
Chrysler Tech
"Mandrake" > wrote in message
newsEhad.2733$z96.1928@clgrps12...
> consider also that this could be caused by a cracked cyl head..
>
> "Geoff" > wrote in message
> icas.hpqcorp.net...
>
>
> Joe Pfeiffer wrote:
>
> > Date: 29 Sep 2004 08:25:54 -0600
> > From: Joe Pfeiffer >
> > Newsgroups: rec.autos.makers.chrysler
> > Subject: Head Gasket Leak?
> >
> > Geoff > writes:
> >
> > > Dave McCormick wrote:
> > > >
> > > > 1990 3.3L Grand Voyager - lots of miles. When it gets hot, lots and
> > > > lots of gas bubbles start appearing in the coolant overflow
container.
> > > > I've seen this before in other vehicles - I gather there can't be
any
> > > > other cause than a leaky head gasket, right? Is there any need to
> > > > confirm this cause with any reliable test?
> > >
> > > It probably is a head gasket leak. One reliable test you could
perform
> > > that is also inexpensive is a compression check. It sounds like the
> > > leak is between one of the cylinders and a water jacket; a compression
> > > check would reveal one cylinder with low compression, or possibly two
> > > next to each other with low compression.
> > >
> > > I believe you can get a compression tester for under $50.
> >
> > His car has already flunked a pretty reliable test of head gasket
> > integrity....
> >
> > I once had a car with a blown head gasket that flunked the bubble test
> > but had compression within specs on all cylinders.
>
> Really? Did you find the source of the leak?
>
> I agree, the overheating and bubbling into the coolant reservoir is
> probably enough to condemn a headgasket in this case. I understand there
> are also kits you
> can get that will detect the presence of exhaust gasses in the coolant;
> these can be used
> to confirm a head gasket diagnosis when the problem is less obvious.
>
> But a bubbler that passed a compression check, eh? Wow. I didn't know
> that could happen. Did one of the cylinders have lower compression than
> the others, but still read nominally within spec?
>
> --Geoff
>