5-25-11
Having the same kind problems and the heater core has been changed 3 times.
Still have pool of anti freeze in the front passenger floor and the in back floor.
There is a vapor that comes out through the vents on the inside of the car.The
make is a 2006 Pontiac G6
Comments
6-13-11
Symptoms are identical to my Pontiac Grand Am SE '98.   Heater core blew.  
Bypassed it, but now my water pump is leaking like a sieve.   Water pumps and
heater cores seem to fail about the same time - based on past experiences with
older model cars.  Both jobs expensive (in Canada) to fix due to labour and time.
2007 Pontiac G6. Adding coolant all the time.
Back at the beginning of Summer 2010, I discovered my passenger front floor bed was soaking wet.
So wet that you could push on the carpet and water would come to the top. At that time it did appear
to have any other problems.

Mid way through the summer my car started running hot on the temperature gauge. We checked
the coolant level and it was very low. My husband added coolant twice in two days. Someone then
told us that we messed up because we added standard coolant. We then got some of the special
coolant that had to be added and we didn't have to add anymore coolant and it stopped over
heating. Now that it is getting cold my heater will not blow warm or hot air while idle just cold air. I am
trying to find out if this would be heater core? If it may be also how to replace it?

Answer:
You've obviously got a major problem going on with your car. When you first found coolant on the
floor of the passenger compartment, that would have been coming from the heater core, or
attached heater hoses, unless it was just water and not antifreeze.

Adding the wrong coolant isn't a big deal, unless it's run mixed with Dexcool for an extended period
of time. When they mix, they cause a corrosive effect on the cooling system, which usually leads to
more problems. What ever leaks you had were probably sealed due the mixing of coolant and the
resulting build-up. The reason you have no heat now, is either from the heater core being
clogged/bad or lack of coolant, or a possible thermostat issue or air pockets in the cooling system.
This could be caused by a bad head gasket.

The rear head is most common. With a bad head gasket, engine compression can be pumped into
the cooling system causing air pockets- and thus no heat.. You would need to feel the heater hoses
when the car is at operating temperature and if they are both hot and you still have no heat in the
car, you probably have a bad heater core. That is a very big job and involves removing the entire
dash and heater case to replace it. Not for the average do it yourself kind of guy.


1994 Pontiac Grand Am warning lights orange. It used to be on. Was emission related-NOW WE
NEED THE WATER PUMP To repair.
PLEASE SEND THE SCHEMATIC SHOWING WHERE THE PUMP IS SO WE CAN FIX IT. WE ARE
50, AND KNOW THIS SOUND!!

The water pump is making noise, and we are 100% SURE THAT IS WHAT IT IS, AS WE HAVE
HEARD THIS ON NUMERABLE OTHER VEHICLES WE HAVE HAD IN OUR PAST 40 YEARS OF
CAR OWNERSHIP!! PLEASE JUST SEND DIAGRAMS AND INSTRUCTIONS HOW TO REPLACE IT!!

Answer:
Really? Complete diagrams and instructions from a FREE auto repair site? Get a manual or pay for
the repair on your car.


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Pontiac G6 Over Heating And Coolant Leak On The Floor
Pontiac G6 head gasket leaking causes engine overheating.