02-17-2014, 11:07 PM | #1 |
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Location: Kansas and Iowa
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Antifreeze leak...
I am having an issue with the 350 in my green '70. It likes to leak coolant. It is collecting in the little valleys of the Edelbrock intake manifold up by the thermostat housing. I checked all around the housing and couldn't find anywhere it could be seeping out. I have checked the front 2 bolts on the intake manifold and they're tight. I can't figure out where it's leaking from. It doesn't seem to use much coolant, but I don't like the idea of having antifreeze sitting on top of the intake. Has anyone else had this problem with Edelbrock intakes?
Thanks!
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White70C20 1970 Blue C20 - 250, 4 speed 1985 Ford Thunderbird 2005 Pontiac G6 |
02-17-2014, 11:20 PM | #2 |
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Location: Chandler AZ
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Re: Antifreeze leak...
First thing to do is find out where it's leaking from. There is the t-stat housing and the temp sender. AND if you have a chromed tstat housing, many times the coolant will leak between the chrome and the housing. If you have a chrome housing, look for blisters in the chrome.
Mine was doing the same thing for a while. Check to see if the bolt holes for the t-stat go through to the water jacket. One of mine did. I used a new bolt, cleaned the threads of the manifold, then put silicone sealer on the threads of the bolt. Once everything was tightened down NO MORE leak. Best of luck
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 Last edited by Longhorn 70; 02-17-2014 at 11:41 PM. |
02-17-2014, 11:24 PM | #3 |
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Location: pflugerville texas
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Re: Antifreeze leak...
Wouldn't say problem really. Is it leaking from the gasket or wicking up the bolts. Have you tried retorqing the bolts to see if the leak stops?
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1969 Chevy Stepside |
02-17-2014, 11:38 PM | #4 |
Chance
Join Date: Sep 2001
Location: Belcourt ,ND, USA
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Re: Antifreeze leak...
I had that problem last year. After I re torqued the bolts to specs it resolved the problem.
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1968 Chevrolet Stepside BB 396 w/TH400 1972 Chevrolet 3/4 Ton 4x4 BB 496 w/TH400 |
02-18-2014, 12:13 AM | #5 |
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Re: Antifreeze leak...
If you used a used intake, it might have been warped. Rare but it could happen. Also, I second the chromed t stat housing. The dressup kit ones and auto parts store ones will leak. They warp at the base also. Summit has a good chrome one with a thick base
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1967custom |
02-18-2014, 12:25 AM | #6 |
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Location: Columbia, SC
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Re: Antifreeze leak...
Just did mine and had to re tighten the hose clamp from the upper radiator to the water neck. Leaned on it a little and squirt. Had to retourque intake bolts too.
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Life is too long to go slow... 71 GMC 1500 Super Custom LWB 350/350 AC(replaced w/vintage air)/PS/PB 2.5 CPP Spindle, 1" CPP Drop Spring, CPP Front and Rear Sway Bars/DJM Flip, new General Spring KC 5 spring pack, HEI /IntReg Alt 20x8.5 OldSkools 5" BS, 275/45 Falkens |
02-18-2014, 06:03 PM | #7 |
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Location: Kansas and Iowa
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Re: Antifreeze leak...
It doesn't appear to be leaking from the thermostat housing. What is the torque spec for the bolts on the housing? I'll check them to see if they're tight. I guess, as long as it doesn't use a whole lot of coolant, I could leave it the way it is for a while.
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White70C20 1970 Blue C20 - 250, 4 speed 1985 Ford Thunderbird 2005 Pontiac G6 |
02-18-2014, 06:08 PM | #8 |
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Re: Antifreeze leak...
It is only 25-35 lbs, but the order you do it in is important too, starting with the inner four bolts then working out to the four corners
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Life is too long to go slow... 71 GMC 1500 Super Custom LWB 350/350 AC(replaced w/vintage air)/PS/PB 2.5 CPP Spindle, 1" CPP Drop Spring, CPP Front and Rear Sway Bars/DJM Flip, new General Spring KC 5 spring pack, HEI /IntReg Alt 20x8.5 OldSkools 5" BS, 275/45 Falkens |
02-20-2014, 11:35 AM | #9 |
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Re: Antifreeze leak...
Isn't that the torque sequence for the intake? While that is good to know, I was wanting to know about the torque specs for the thermostat housing bolts. Thanks though!
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White70C20 1970 Blue C20 - 250, 4 speed 1985 Ford Thunderbird 2005 Pontiac G6 |
02-20-2014, 12:44 PM | #10 |
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Re: Antifreeze leak...
Oops sorry. I wouldn't go much more than 25 lbs. I used the two part aluminum neck with the oring and just tightened by hand with an Allen wrench till it didn't turn anymore. No leaks.
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Life is too long to go slow... 71 GMC 1500 Super Custom LWB 350/350 AC(replaced w/vintage air)/PS/PB 2.5 CPP Spindle, 1" CPP Drop Spring, CPP Front and Rear Sway Bars/DJM Flip, new General Spring KC 5 spring pack, HEI /IntReg Alt 20x8.5 OldSkools 5" BS, 275/45 Falkens |
02-20-2014, 12:45 PM | #11 |
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Re: Antifreeze leak...
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Life is too long to go slow... 71 GMC 1500 Super Custom LWB 350/350 AC(replaced w/vintage air)/PS/PB 2.5 CPP Spindle, 1" CPP Drop Spring, CPP Front and Rear Sway Bars/DJM Flip, new General Spring KC 5 spring pack, HEI /IntReg Alt 20x8.5 OldSkools 5" BS, 275/45 Falkens |
02-20-2014, 12:50 PM | #12 |
Hittin E-Z Street on Mud Tires
Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: Antifreeze leak...
Do you have a factory looking housing or a chrome one as mentioned above? If you have the chrome one order a GM unit and toss the chrome one. Mine had the same problem. I would reseal and torque it (did this a few times), it would be leaking again in 2-6 months. I replaced it with a GM unit and it hasn't leaked in over a year.
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Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! |
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