Common area of coolant leak on GM 3.1l / 3.4l v6 engines.
Coolant leak area under throttle body near thermostat housing. 3.1 and 3.4 v6 engines.
Common coolant leak areas on lower intake of 3.1 and 3.4 GM engines.
1- Behind the power steering pump,
leaks down where intake meets
cylinder head.
2- Near coolant temp. sensor, and
around lower intake bolt.
Note: throttlebody and exhaust
crossover removed for easier viewing.
Comments
12-14-10
MY 1999 CHEVY  BOUGHT NEW HAS LESS THAN 50,000 MILES    JUST GOT THE BAD
NEWS IT NEEDS  NEW  ENGINE HAD ANTI FREEZE LEAK  I UNDERSTAND IT IS A
COMMON PROBLEM   DOES  g m  DO ANYTHING TO HELP DEFRAY THE COST?
.This is a very common problem, but GM does not offer
any reimbursement for this repair.
I have used a product called therm-a-gasket with great
success
12-14-10
MY 1999 CHEVY  BOUGHT NEW HAS LESS THAN 50,000 MILES    JUST GOT THE BAD
NEWS IT NEEDS  NEW  ENGINE HAD ANTI FREEZE LEAK  I UNDERSTAND IT IS A
COMMON PROBLEM   DOES  g m  DO ANYTHING TO HELP DEFRAY THE COST?
10-18-11
I had problems with my 3.1 in a malibu and had intake gasket job done for $700. 60 days
later it appears to be leaking behind the timing cover? Did they take that apart to fix the
intake?
Doing the intake manifold gaskets would have nothing to
do with the front timing cover gasket leaking. These are
a little common on high mileage cars, but  not nearly as
much as the intake gaskets.
2-9-12
Clear sticky fluid leak on garage floor every morning  my coolant is low. Have a 2008 GM
pickup.
6-28-12
I HAVE A 2002 CHEVY MALIBU THAT LEAKING COOLANT FAST FROM ONE OF THE
PULLEYS. HOW DO I KNOW IF ITS THE WATER PUMP
Anywhere besides LIM, head gasket, oil cooler, or cracked head or block that
would cause oil to mix with coolant? Or vice versa. Cannot find the leak? Help!
Nope. Nothing else that would cause the mixing.
The water pump is in the lower location of picture #1
above. A small black plastic cover is over the belt on that
pulley. Water pumps usually sling coolant over all
pulleys. Odds are it is the water pump.
My 1997 grand am 3.1 has a leak on the fire wall left of the heater core lines.
Above a/c
compressor. What bolt is that and what do i need to fix it?
Okay now you are really confusing me. You say the leak
is on the firewall near the heater core lines, and above
the A/C compressor. The the A/C compressor is not on
the firewall. What do you mean by asking what bolt that
is. There are thousands of bolts.
My car is a Chevy Malibu 99 2.4 engine and is leaking water almost from the
middle what could cause this.
Could be the water pump if it is more toward the
passenger side. Or the coolant outlet housing if on the
drivers side.
I have a 2003 Impala with the 3400 engine.  I have not had the usual problem with the
leaking gaskets, probably because I changed the original coolant long ago.  However, I
seem to have a constant corrosion problem.  Heavy Iron Oxide buildup in the cooling
system, even with anti-freeze.  Any ideas what this may be?  I flushed the system less than
a year ago and I am currently flushing again after a water pump replacement and I would
feel better if I knew what this problem was.
The Dexcool is known for doing that. If you changed the
gaskets a long time ago, they may be leaking. No gasket
out is a permanent fix. Sometimes they leak internally,
slowly and cause this problem. Also the rear headgasket
may be leaking internally pushing combustion gases into
the cooling system. Remove the #1 spark plug from the
passenger side of the rear head and look for corrosion.

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Coolant Leaks On The GM 3100 (3.1) and 3400 (3.4L) Engines