1996 STS coolant overflow
#1
1996 STS coolant overflow
I own a 1996 Seville STS. By design, there is no coolant overflow tank and occasionally the coolant reservoir, which is mounted on the passenger inner fender,will leak coolant out of the radiator cap. I have replaced the cap with a new one, but still see the coolant leaks, when the reservoir tank is full. Is this normal? This is the first car I have owned without an overflow tank. So I am under the impression the reservoir tank should always be full...conversely it is always low. The car does not run hot according to the temp gauge. So, I see no evidence of the thermostat sticking, or causing overheating. Everything seems to run normal...just the annoying coolant leaks through the cap and the resulting low coolant level. I am wondering if this is par for this model. Anyadvice would be appreciated.
#2
RE: 1996 STS coolant overflow
ORIGINAL: justtalkin
I own a 1996 Seville STS. By design, there is no coolant overflow tank and occasionally the coolant reservoir, which is mounted on the passenger inner fender,will leak coolant out of the radiator cap. I have replaced the cap with a new one, but still see the coolant leaks, when the reservoir tank is full. Is this normal? This is the first car I have owned without an overflow tank. So I am under the impression the reservoir tank should always be full...conversely it is always low. The car does not run hot according to the temp gauge. So, I see no evidence of the thermostat sticking, or causing overheating. Everything seems to run normal...just the annoying coolant leaks through the cap and the resulting low coolant level. I am wondering if this is par for this model. Anyadvice would be appreciated.
I own a 1996 Seville STS. By design, there is no coolant overflow tank and occasionally the coolant reservoir, which is mounted on the passenger inner fender,will leak coolant out of the radiator cap. I have replaced the cap with a new one, but still see the coolant leaks, when the reservoir tank is full. Is this normal? This is the first car I have owned without an overflow tank. So I am under the impression the reservoir tank should always be full...conversely it is always low. The car does not run hot according to the temp gauge. So, I see no evidence of the thermostat sticking, or causing overheating. Everything seems to run normal...just the annoying coolant leaks through the cap and the resulting low coolant level. I am wondering if this is par for this model. Anyadvice would be appreciated.
something is amiss.
#3
RE: 1996 STS coolant overflow
I believe that what you are referring to as a coolant reservoir tank is what I call the coolant
expansion tank. As the engine heats up the coolant expands and needs a place to go.
How full are you filling the expansion tank? When the engine is cold it should only be about
1/4 full. As the coolant temp. rises the coolant will ' expand ' into the tank. If you keep
filling the expansion tank to the top, the heated coolant has no place to go but out through
the overflow hose. When the engine cools, it creates a vacuum in the cooling system that draws the coolant back into the radiator. Do you keep adding coolant to the expansion tank
to keep it full? If so, you are probably overfilling the cooling system and when the coolant gets hot it just keeps spewing out.
expansion tank. As the engine heats up the coolant expands and needs a place to go.
How full are you filling the expansion tank? When the engine is cold it should only be about
1/4 full. As the coolant temp. rises the coolant will ' expand ' into the tank. If you keep
filling the expansion tank to the top, the heated coolant has no place to go but out through
the overflow hose. When the engine cools, it creates a vacuum in the cooling system that draws the coolant back into the radiator. Do you keep adding coolant to the expansion tank
to keep it full? If so, you are probably overfilling the cooling system and when the coolant gets hot it just keeps spewing out.
#5
RE: 1996 STS coolant overflow
ORIGINAL: jerrymac
I believe that what you are referring to as a coolant reservoir tank is what I call the coolant
expansion tank. As the engine heats up the coolant expands and needs a place to go.
How full are you filling the expansion tank? When the engine is cold it should only be about
1/4 full. As the coolant temp. rises the coolant will ' expand ' into the tank. If you keep
filling the expansion tank to the top, the heated coolant has no place to go but out through
the overflow hose. When the engine cools, it creates a vacuum in the cooling system that draws the coolant back into the radiator. Do you keep adding coolant to the expansion tank
to keep it full? If so, you are probably overfilling the cooling system and when the coolant gets hot it just keeps spewing out.
I believe that what you are referring to as a coolant reservoir tank is what I call the coolant
expansion tank. As the engine heats up the coolant expands and needs a place to go.
How full are you filling the expansion tank? When the engine is cold it should only be about
1/4 full. As the coolant temp. rises the coolant will ' expand ' into the tank. If you keep
filling the expansion tank to the top, the heated coolant has no place to go but out through
the overflow hose. When the engine cools, it creates a vacuum in the cooling system that draws the coolant back into the radiator. Do you keep adding coolant to the expansion tank
to keep it full? If so, you are probably overfilling the cooling system and when the coolant gets hot it just keeps spewing out.
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