6th Gen ('00-'05): Overflow tank fills with antifreeze when I hit the gas?
Thread Starter
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Joined: Apr 2017
Posts: 8
Overflow tank fills with antifreeze when I hit the gas?
One thing I've noticed about my 2005 Chevrolet Monte Carlo LT is that whenever I hit the gas (and this is every single time mind you) I can hear the overflow tank fill up with coolant. Does this mean there's air in my cooling system? Or is this a normal thing with the GM 3800 V6 NA that I'm not aware of. I'd like to also mention that there's no check engine light, I'm not sure of the service history of my vehicle, and I've noticed it's pretty easy for my car to go slightly over normal operating temperature at idle sometimes
Monte Of The Month -- January 2016
Joined: Feb 2013
Posts: 2,293
From: Pacific NW
That's not normal!
Sounds like combustion gas is mixing with the coolant through a leak, either through a head gasket or a crack in the block. If you removed the radiator cap with the car warm and running I bet it would spew coolant out when you revved the motor. I suggest a cylinder leak down test.
Sounds like combustion gas is mixing with the coolant through a leak, either through a head gasket or a crack in the block. If you removed the radiator cap with the car warm and running I bet it would spew coolant out when you revved the motor. I suggest a cylinder leak down test.
Joined: May 2015
Posts: 95
From: Long Island, New York
That's not normal!
Sounds like combustion gas is mixing with the coolant through a leak, either through a head gasket or a crack in the block. If you removed the radiator cap with the car warm and running I bet it would spew coolant out when you revved the motor. I suggest a cylinder leak down test.
Sounds like combustion gas is mixing with the coolant through a leak, either through a head gasket or a crack in the block. If you removed the radiator cap with the car warm and running I bet it would spew coolant out when you revved the motor. I suggest a cylinder leak down test.
Thread Starter
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Joined: Apr 2017
Posts: 8
got it tested. No head gasket leak (thank goodness) and as I got it tested I remembered both instances when the temperature gauge spiked it was 95-100 degrees outside and I was driving on the highway. Now what I should mention is that when I say spike I mean like 1-2 points above normal operating temperature. So to put it simply I'm not sure why I brought up the temp at all
Monte Of The Month -- January 2016
Joined: Feb 2013
Posts: 2,293
From: Pacific NW
[QUOTE=Jason B;705689]A bad radiator cap could cause this, could it not?[/QUOT
Indeed, a bad radiator cap could cause this. As a cap ages the spring that controls the pressure can release early letting fluid spill out into the reservoir.
Air also is let into the system which than passes air bubbles into the cooling system. Since air is not good at transferring heat quickly a motor can overheat more easily when air bubbles are in the system. For the cost of a new cap it's definitely worth replacing.
Indeed, a bad radiator cap could cause this. As a cap ages the spring that controls the pressure can release early letting fluid spill out into the reservoir.
Air also is let into the system which than passes air bubbles into the cooling system. Since air is not good at transferring heat quickly a motor can overheat more easily when air bubbles are in the system. For the cost of a new cap it's definitely worth replacing.
Joined: May 2015
Posts: 95
From: Long Island, New York
[QUOTE=plumbob;705704]
Absolutely. I would pull the cap and just see what the spring feels like, and either way replace it.
A bad radiator cap could cause this, could it not?[/QUOT
Indeed, a bad radiator cap could cause this. As a cap ages the spring that controls the pressure can release early letting fluid spill out into the reservoir.
Air also is let into the system which than passes air bubbles into the cooling system. Since air is not good at transferring heat quickly a motor can overheat more easily when air bubbles are in the system. For the cost of a new cap it's definitely worth replacing.
Indeed, a bad radiator cap could cause this. As a cap ages the spring that controls the pressure can release early letting fluid spill out into the reservoir.
Air also is let into the system which than passes air bubbles into the cooling system. Since air is not good at transferring heat quickly a motor can overheat more easily when air bubbles are in the system. For the cost of a new cap it's definitely worth replacing.