Coolant Overflow
06-03-2007, 12:08 PM
#1
2nd Gear Member
Thread Starter
Join Date: Apr 2007
Location: Pearland, TX
Posts: 158
Coolant Overflow
After flushing the radiator she was running cold as ice about 140F. But after I womp on it and get RPMs up in about 4500-5000 it's starts getting really hot. I checked the rad and its always low on coolant after I drive hard. All the coolant is going back into the overflow tank, like almost ALL of it. Then it runs hot (260ish) til I fill the rad back up. Replaced bottom hose when I did the flush as well as the rad cap. Any ideas.
06-03-2007, 12:12 PM
#2
The Rogue Mod
Join Date: Feb 2006
Location: Maryland Sucka's!!
Posts: 21,918
RE: Coolant Overflow
Are both radhoses getting hot? Feel the air coming across the rad when it's running hot. If the air is cool/cold, possibly an air pocket. What's the condition of the radiator cap? If it's weak, it can let the coolant flow back into the reservoir when it shouldn't.
06-03-2007, 12:17 PM
#3
2nd Gear Member
Thread Starter
Join Date: Apr 2007
Location: Pearland, TX
Posts: 158
RE: Coolant Overflow
ORIGINAL: PRO50SC
Are both radhoses getting hot? Feel the air coming across the rad when it's running hot. If the air is cool/cold, possibly an air pocket. What's the condition of the radiator cap? If it's weak, it can let the coolant flow back into the reservoir when it shouldn't.
Are both radhoses getting hot? Feel the air coming across the rad when it's running hot. If the air is cool/cold, possibly an air pocket. What's the condition of the radiator cap? If it's weak, it can let the coolant flow back into the reservoir when it shouldn't.
06-03-2007, 12:26 PM
#5
2nd Gear Member
Thread Starter
Join Date: Apr 2007
Location: Pearland, TX
Posts: 158
RE: Coolant Overflow
Yes I know it was the correct one for my rad. The rad cap was actually replaced several days after the actual flush. And I did not see any difference with the new cap. I don't think the cap is the prob.
I was thinking maybe should pressure test it?
I was thinking maybe should pressure test it?
06-03-2007, 01:20 PM
#6
3rd Gear Member
Join Date: Nov 2006
Location: PA
Posts: 823
RE: Coolant Overflow
Your head gasket is blown between your water jacket and the cylinder. When the piston comes up, the compression is forced into the coolant system and as the pressure builds, it goes higher than what the cap is rated at and thenthe coolantstarts to pump out of the radiator into the overflow. Only when you shut off the motor will coolant leak into the cylinder (because the pressure in the radiator is now higher than in the cylinder)and lay there until you start the motor and you will see some white smoke come out the tail pipe and then it will go away. And the whole process will start all over again.An old cap or a blown head gasket are the only things that will cause coolant to flow into the overflow... and since you said the cap is new... the gasket has to be shot.
06-04-2007, 03:34 PM
#7
2nd Gear Member
Thread Starter
Join Date: Apr 2007
Location: Pearland, TX
Posts: 158
RE: Coolant Overflow
ORIGINAL: capri debris
Your head gasket is blown between your water jacket and the cylinder. When the piston comes up, the compression is forced into the coolant system and as the pressure builds, it goes higher than what the cap is rated at and thenthe coolantstarts to pump out of the radiator into the overflow. Only when you shut off the motor will coolant leak into the cylinder (because the pressure in the radiator is now higher than in the cylinder)and lay there until you start the motor and you will see some white smoke come out the tail pipe and then it will go away. And the whole process will start all over again.An old cap or a blown head gasket are the only things that will cause coolant to flow into the overflow... and since you said the cap is new... the gasket has to be shot.
Your head gasket is blown between your water jacket and the cylinder. When the piston comes up, the compression is forced into the coolant system and as the pressure builds, it goes higher than what the cap is rated at and thenthe coolantstarts to pump out of the radiator into the overflow. Only when you shut off the motor will coolant leak into the cylinder (because the pressure in the radiator is now higher than in the cylinder)and lay there until you start the motor and you will see some white smoke come out the tail pipe and then it will go away. And the whole process will start all over again.An old cap or a blown head gasket are the only things that will cause coolant to flow into the overflow... and since you said the cap is new... the gasket has to be shot.
So if what your saying is correct, if I pressure test the radiator there will be more pressure in the rad then in the cylinder so I should see a steady drop in pressure of the rad, correct?
06-04-2007, 07:52 PM
#8
5th Gear Member
Join Date: Feb 2006
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Posts: 3,768
RE: Coolant Overflow
ORIGINAL: capri debris
Your head gasket is blown between your water jacket and the cylinder. When the piston comes up, the compression is forced into the coolant system and as the pressure builds, it goes higher than what the cap is rated at and thenthe coolantstarts to pump out of the radiator into the overflow. Only when you shut off the motor will coolant leak into the cylinder (because the pressure in the radiator is now higher than in the cylinder)and lay there until you start the motor and you will see some white smoke come out the tail pipe and then it will go away. And the whole process will start all over again.An old cap or a blown head gasket are the only things that will cause coolant to flow into the overflow... and since you said the cap is new... the gasket has to be shot.
Your head gasket is blown between your water jacket and the cylinder. When the piston comes up, the compression is forced into the coolant system and as the pressure builds, it goes higher than what the cap is rated at and thenthe coolantstarts to pump out of the radiator into the overflow. Only when you shut off the motor will coolant leak into the cylinder (because the pressure in the radiator is now higher than in the cylinder)and lay there until you start the motor and you will see some white smoke come out the tail pipe and then it will go away. And the whole process will start all over again.An old cap or a blown head gasket are the only things that will cause coolant to flow into the overflow... and since you said the cap is new... the gasket has to be shot.
I thought coolant is supposed to flow into the overflow container as the engine heats up...and then back into the radiator as it cools down--hence the hot and cold fill marks on the overflow tank. Is this not correct?
