LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Car is going to 260+ degrees!!!!

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Old Apr 3, 2007 | 01:30 PM
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Default Car is going to 260+ degrees!!!!

Got the motor all together and it starts up and runs great! But right before i shut her down i realized the temp guage reads "260" so i imeadiatly shut it off. After about 1-2 minutes the car was started again and the guage read 180 at startup. but then quickly rose to 260 ( about about 20 seconds ). The waterpump is new and it has 2gallons of PEAK 50/50 coolant in it. I opened the radiator cap and was wondering if i could top it off with water? The bottle says not to but i think 2gallons may not be enough.

It's running open headers with no o2's right now. Has EGR deleted and no Air pump. lemme know what yall think!
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Old Apr 3, 2007 | 01:34 PM
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Takes close to 4 gallons to fill the entire system.

Did you check your thermostate on the stove ?
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Old Apr 3, 2007 | 01:43 PM
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4 gallons!??!?! well christ that is prolly right! yes i checked the stat. dad said 2 gallons would be enough. Should i fill the rest with water?

car also has not A/C lines if that makes a difference
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Old Apr 3, 2007 | 01:45 PM
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Sounds like either the system needs more coolant/water mix or the waterpump is not working.
Did you bleed out the air bubbles when you filled it?
Also, make sure you use an LT1 thermostat (the tall ones) not a SBC thermostat
and that it is installed with the spring down.

With the car cooled down, pop the radiator cap and check the fluid level.
Also start the car and see if coolant is being pumped into the radiator
(should be a solid stream just below the cap)

Make sure you keep close to a 50/50 mix of water and coolant.
Too much of either will cause cooling problems.
If you already put in 1gal of coolant and 1gal of water, add an equal amount of each until it's full.
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Old Apr 3, 2007 | 01:47 PM
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yah fill the rest with water or coolant just get something in there. I would let the car cool down completley. then fill it and make to open the bleed screws to get the air out. Then let it idle with the cap off until the thermostat opens at that point you should see some air come out and need to add some water. Do this and then check it again when it cools off.
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Old Apr 3, 2007 | 01:48 PM
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all that is correct. i think its not enough coolant cause i cant even see any when i open the radiator cap. Can i fill the rest of the system up with water? or two more gallons of peak?
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Old Apr 3, 2007 | 01:49 PM
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WILL DO! * goes and grabs the water hose*
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Old Apr 3, 2007 | 02:12 PM
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WORKED! thanks guys.....it needed about another 1 1/2 gallons to be full. thanks guys!
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Old Apr 3, 2007 | 07:12 PM
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wow, im surprised you didnt scrap the motor at 260 degrees
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Old Apr 5, 2007 | 12:57 PM
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2 gallons of straight anti-freeze is correct. Then top off with water but if its a brand new motor and using 50/50 peak it will take close to 4 gallons of peak. dont top off with water because its a 50/50 mix.
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Old Apr 5, 2007 | 02:05 PM
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the motor was more near 235-240 degrees. everything is fine now, idled for 20 minutes and never went above 180.....open headers for 20 minutes did make my ears ring for a bit....
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Old Apr 16, 2007 | 10:05 AM
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wow...
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Old Apr 16, 2007 | 10:31 AM
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Originally Posted by fmaznicki
wow...
WTF is the point of saying that?
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Old Apr 16, 2007 | 10:35 AM
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Originally Posted by camzaro28
WTF is the point of saying that?
i was thinking the same thing... he must be one of those random guys who chimes in like he knows what he's talking about...
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Old Apr 16, 2007 | 11:19 AM
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Originally Posted by sdm1234
i was thinking the same thing... he must be one of those random guys who chimes in like he knows what he's talking about...
He's got a post count of 1 .. give the guy a break.
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Old Apr 16, 2007 | 11:26 AM
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Originally Posted by sdm1234
i was thinking the same thing... he must be one of those random guys who chimes in like he knows what he's talking about...
He just wanted to get his post count up BTW glad you didn't overheat your car man.
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Old Apr 16, 2007 | 11:38 AM
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Originally Posted by fmaznicki
wow...

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Old Apr 19, 2007 | 06:26 PM
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Dont use water out of the house use distilled water
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