Car overheating and bubbling really bad in the Overflow

Asked by Sep 19, 2017 at 10:13 PM about the 2008 Chevrolet Impala LS

Question type: Maintenance & Repair

If it is bubbling and it is overheating then you
probably have air in your system you have to take
the radiator cap off turn your heat on defrost and
let it run when the fluid goes down further you'll
have to add more antifreeze and then take it for a
drive make sure the fluid is going through the
heater core and if it is go back home let it sit and
do the same process over again if it's still
overheating then you still have air in your lines do
the process again that's what I did and it worked

13 Answers


Good for you!

You have a cracked head! Go to a reputable mechanic and have him check the compression on each one of the cylinders....You're looking at a 1300.00 or so job. if you find out for sure that this is what it is there are products on the market that can fix this for less than a hundred...

if you have air in your system it is because the coolant is leaking into one or more cylinders!

Sorry for the bad news, but that is what your problem is.

You can pull the plugs yourself...If any or more than one is wet with coolant on it, that is where that coolant is coming in the cylinder from the cracked head..

Changing the thermostat and water pump will not fix a cracked head...

Typically driving a car for about roughly 5 miles and she will start to overheat with a cracked head

Do you have white smoke coming out of your tailpipe when she starts to overheat?


Sounds like exhaust in cooling system if you get bubbles in over-flow tank while running engine and this is not upon filling the cooling system while empty, as air that needs bleed out will get stuck in a portion of the cooling system that will have to perform bleed procedure to get it out. If it just one day starts bubbling like when sitting at a red light or stop sign after going down the road then its a exhaust passing threw head gasket into cooling system. See if it comes back. Let us know.

1 of 1 people found this helpful.

Test for exhaust in coolant.


Question is why did it overheat, are fans working, bad thermostat and how did it loose anti-freeze, these are closed systems and do not require coolant on a regular basis unless its leaking somewhere. With exhaust in coolant you may not have white smoke from exhaust. It will overheat.


You do not just one day have air in the cooling system unless it was opened up like a thermostat or water pump changed or bad cap, so where did the air come from?

1 of 1 people found this helpful.

Idk but I'm good now no problems after I flushed and bleed the air out and yes one day it was bubbleing nothing is wrong with the car other then that took to the shop after done and got it checked its all good

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