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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

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Old 01-20-2007, 01:49 PM   #1 (permalink)
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cooling system stop leak that WON'T plug your radiator

yeah. anybody know where i can find some? i can see fresh green ethylene glycol leaking where the engine meets the transmission. the only thing i can think of is a freeze plug on the block that is hiding in the transmission bellhousing.

it's not a fast leak, i've just had to add some coolant to the overflow reservoir every 600-700 miles or so.

so ya, before i drop the tranny to replace a 3 dollar freeze plug, has anybody had any experience with stop leak that WON'T plug up my radiator? thanksssss!
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Old 01-20-2007, 02:28 PM   #2 (permalink)
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There are no freeze plugs back there, so must be coming from somewhere else...

and I dont think they are made, as thats how they work.. they plug stuff up.
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Old 01-20-2007, 03:45 PM   #3 (permalink)
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I would trace that leak, mine drips from there but actually travels there from my water pump.
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Old 01-20-2007, 09:19 PM   #4 (permalink)
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check the heater core hoses.

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Old 01-21-2007, 12:18 AM   #5 (permalink)
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There is also a small coolant hose on a block on the back of the intake. it is on the passenger side by the firewall. it's about a 3/8 hose and could be mistaken for a vacuum hose. Pressure test and fix the leak, I have seen many radiators and heater cores plugged by trying quick fixes.
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Old 01-21-2007, 01:13 AM   #6 (permalink)
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I had a similar problem. Turned out to be a leaky hose connected to the valve that lets coolant flow to the heater core. on my truck the valve is just behind the intake plenum
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Old 02-06-2007, 09:56 AM   #7 (permalink)
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there is no doubt about it. this leak is coming from the back of the engine inside the bellhousing of the transmission.

i pressure tested the system at 15 psi and there was an ever so slight drop (barely even noticeable) in pressure after a few minutes.

i added some bar's leak and followed the instructions word for word. this stuff looks and smells pretty nasty so i only added about 1/3 of the bottle. about a week has gone by and there is no green ethylene glycol leaking anymore. i plan on keeping my eye to make sure there are no future leaks.

i will probably flush the cooling system in the near future. that stuff was pretty nasty, but looks like it did the job. my radiator hasn't gotten plugged up... yet.
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el trucko kills tie fighters and soccer moms.


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98 tacoma 4x4 sr5
3.4 v6 5 spd
stock with 31s
mr taco, you were a great pal. may you live long and prosper.


THE MILLENIUM FALCON (R.I.P.)

87 4runner efi sr5
ummm rolled over with lots of junk that i wasted my money on.

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Old 02-06-2007, 10:41 AM   #8 (permalink)
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there is no doubt about it. this leak is coming from the back of the engine inside the bellhousing of the transmission.

i pressure tested the system at 15 psi and there was an ever so slight drop (barely even noticeable) in pressure after a few minutes.

i added some bar's leak and followed the instructions word for word. this stuff looks and smells pretty nasty so i only added about 1/3 of the bottle. about a week has gone by and there is no green ethylene glycol leaking anymore. i plan on keeping my eye to make sure there are no future leaks.

i will probably flush the cooling system in the near future. that stuff was pretty nasty, but looks like it did the job. my radiator hasn't gotten plugged up... yet.
I did the EXACT same thing recently with a slight leak. No ill effects YET.
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Old 02-06-2007, 09:22 PM   #9 (permalink)
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i had a slight leak way behind the plenum. Way to involved to change it out. I have had it in for quite a while and do not see any bad indications.
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Old 02-27-2007, 09:59 AM   #10 (permalink)
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i have now ran 2/3 of the bottle and i am still seeing a slight leak. i will add the rest of the bottle and hopefully this leak will go away. if not then i'm in trouble.
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stock with 31s
mr taco, you were a great pal. may you live long and prosper.


THE MILLENIUM FALCON (R.I.P.)

87 4runner efi sr5
ummm rolled over with lots of junk that i wasted my money on.

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Old 02-27-2007, 05:04 PM   #11 (permalink)
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I just rebuilt my 22re and I coulda sworn I pulled a freeze plug out of the back of the block. Had an old timer tell me once that black pepper will stop a leak if it aint real big, also heard the raw egg idea. dunno never tried it. Both sound kinda hokey though.
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Old 02-27-2007, 05:22 PM   #12 (permalink)
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Yup, Mythbusters used an egg.
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Old 02-27-2007, 05:30 PM   #13 (permalink)
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Yup, Mythbusters used an egg.
did it work?
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Old 02-28-2007, 10:09 PM   #14 (permalink)
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i found out today there is a freeze plug on the rear of the block. i was at a junkyard and they had a 22re on an engine stand with the flywheel, clutch, and pressure plate assembly removed. there is a large freeze plug above the crank. unless there is a crack in the block, this is the only place the coolant can be coming from.

i am going to add another 1/3 bottle of the bar's leak tomorrow. we'll see what happens. if the leak doesn't go away, i'm probably going to flush the system. i can either live with the leak for a while until i need a new clutch, or drop the tranny and replace the freeze plug and upgrade the clutch while i'm in there. since i'm attending a community college automotive program and have access to a fully loaded shop with all the tools in the world, i can most likely drop the tranny myself with the assistance of my instructors. i won't have to pay for labor, although it's going to be a major PITA!
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28 mpg
el trucko kills tie fighters and soccer moms.


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98 tacoma 4x4 sr5
3.4 v6 5 spd
stock with 31s
mr taco, you were a great pal. may you live long and prosper.


THE MILLENIUM FALCON (R.I.P.)

87 4runner efi sr5
ummm rolled over with lots of junk that i wasted my money on.

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Old 02-28-2007, 10:23 PM   #15 (permalink)
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Quote:
Originally Posted by alanbobalan View Post
yeah. anybody know where i can find some? i can see fresh green ethylene glycol leaking where the engine meets the transmission. the only thing i can think of is a freeze plug on the block that is hiding in the transmission bellhousing.

it's not a fast leak, i've just had to add some coolant to the overflow reservoir every 600-700 miles or so.

so ya, before i drop the tranny to replace a 3 dollar freeze plug, has anybody had any experience with stop leak that WON'T plug up my radiator? thanksssss!
The whole point of these quick cheap fixes is to plug stuff up. There is nothing make anywhere that will plug a leak, but not plug up your radiator.

You'd be better off to just do it right the first time, rather than risk destroying your engine. And remember, just becuase you cant see the plugs, and the truck doesn't overheat, doesn't mean its not happening.
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Old 03-01-2007, 06:25 AM   #16 (permalink)
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Quote:
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And remember, just becuase you cant see the plugs, and the truck doesn't overheat, doesn't mean its not happening.
Very true.. my gauge never hit the red, but I think I got warm and slightly warped the head, which is why my HG blew.. .but all indicatinons were fine.. guess I'll know when I get the head back from the shop. I am takinig it in tomorrow.

If you have access to a shop just drop the tranny and do it correctly.
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Old 03-01-2007, 06:25 AM
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