Most common cause of "mystery dissapearing antifreeze" is bad hose
connections. Loose clamps etc. The entifreeze only comes out then it
is hot, and evaporates right away. The "tell" is white (or pinkinf,
greenish, or yellowish) deposits and sometimes gooey deposits around
the offending connection. Sometimes a bit of "sweet"smell under the
hood with the engine warm.
On Wednesday, December 2, 2015 at 12:09:38 PM UTC-8, Muggles wrote:
If you had coolant getting into your oil, your dipstick would look like it had baby shit on it.
More likely, as in a Lexus ES300 I had here recently, it's getting into the combustion chamber and going out yur tailpipe.
Head gasket problem.
On 12/3/2015 11:55 AM, email@example.com wrote:
Sorry, I meant to say the windshield had fogged up because it was cold.
The heater was only blowing cold air so it wasn't working to defog the
windshield until after I added the antifreeze, THEN it took care of the
I'll bet you do have a gasket leak; probably intake manifold. Had
identical symptoms on '98 Chebby pick'em-up V8. Let it go for several
years and never got large enough to ever see the actual leak as it
evaporated from engine heat as fast as it seeped but finally took it to
the guy in town before a road trip to even more remote ground in NM for
a fence-building weekend last July 4 weekend--figured if it were to fail
catastrophically that'd be the time and that would _NOT_ be the place!!!! :)
Anyway, he did discover it was the intake manifold gasket leaking an
there was no leaking into the crankcase, it was all external (not that
it always is, just that it _can_ be).
OBTW, if this fits your case, don't use the standard GM replacement
gaskets; use the "upgraded" of "heavy duty" ones from Felpro or another
quality 3d-party vendor; they have a metal interface shim whereas the
3.8 ford Vulcan engine.
Check the front timing cover gasket, but particularly the intake
manifold gasket on that engine. If antifreeze was getting into the oil
you would know it - it would be rattling and knocking like crazy.
Also check for a small metal pipe under the throttle body between the
upper and lower intake manifolds. It is brazed from the factory and
the braze sometimes cracks, lettin steem or water out. Can be rebrazwd
or replaced - dealer generally has the part in stock (common failure
Also check the bypass hose between the water pump and manifold. It
gets hard and cracks, or gets gooey and leaks.
On 12/02/2015 8:10 PM, firstname.lastname@example.org wrote:
IME the far more likely culprit on the 3800's is crack in or bad o-ring
on that plastic elbow on the heater return...have had at least one (and
often two or three) 3800 or its descendant 3900 from since their
introduction and never had any other coolant leak on them...it is,
however, generally not long before it's large enough to see the damp spot.
I had a car many years ago that leaked coolant into the cylinder, noticed a
loss of coolant, eventually I found out that I was laying a smoke screen
behind my car. A huge cloud of vapor was pouring out the exhaust. Was told
that if enough water leaked into the cylinder when the engine was stopped,
it could have caused a lot of damage when attempts to restart the engine as
it tried to compress liquid coolant.
Pull and check the spark plugs for contamination. If you find a sign of
coolant, you prolly have a blown head gasket.
There are several other places to check, so start with the hoses or
signs of a leak anywhere in the engine compartment.
Do you get a sound like a leak in the exhast?
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