
Discussion topic: Blow Head Gaskets ; No heat at idle
The customer vehicle that is causing me to initiate this
topic is a 98 Altima 4cyl. ... The vehicle is NOT a Help
Request from me as the boss has already decided to send the
car home with the owner, with a good will free of charge...
We are convinced it is a blown headgasket, though haven't
and don't intend to run a block test to confirm.
______________ Original customer complaint was of no heat
coming from the HVAC vents, we each confirmed at least no
heat AT IDLE .... Seems to be fine most of the time at
operating engine speeds. A coworker replaced water pump, and
it seems he used pliers to pull the heater hoses, so one was
leaking, I repaired that... And we discovered the system has
a bleeder by the upper heater hose on the engine. My initial
cause for concern about the blown head gasket arose when I
saw.... well, nevermind that... The kicker for me, was upon
the last fill with a fill funnel installed, after bleeding,
the cooling system continued to bubble air into the funnel
even 10+ minutes after thermostat opens, and yet, the level
in the funnel was never moving down. There's only one thing
I can think of which can be pumping air into the cooling
system at this point. That's the combustion chambers. I
BELIEVE this is the first instance I've seen of a obviously
blown head gasket that was not exhibiting overheating... The
fans do NOT "stay" on, they seem to operate as they should.
I can't imagine any other reason that this situation
wouldn't be causing overheating of the engine. Any previous
experience or insight to share guys? ___________________
Mason Cobb ![]()
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