Matt16

Aside from coolant passages within the head itself, I didn't know there were any coolant pipes or hoses back under the back/ middle of the intake manifold. Its dripping on the pinion flange area of the front diff.

I'm headed out on a trip Saturday, so I've gotta figure this out by then. I'm headed out in a minute to poke around, but any ideas would be great in the mean time, as time itself is of the essence!.

rotccapt

check the lines that attach to the idle air control valve i found mine leaking a while ago

abecedarian

Also check the pipe that bolts to the bottom of the manifold between 2 & 3 (below the gauge temp sender) and runs back, over the fuel filter, wrapping around the rear of the engine and feeds the heater. It has a two-bolt flange.

Matt16

Its not that. Mine used to leak, but I fixed it. Those hoses aren't easy to find either at the dealer. Toyota doesn't carry them anymore as far as I can tell.

lethe

x2. that one can be annoying to get too.

Matt16

Will be checking that in a minute. I'd forgotten about that one. I know the gasket on that one is RTV instead of a OEM gasket as I didn't have one IIRC.

RMA

this thread just got pointed out take a look. 15 hoses
https://www.yotatech.com/forums/f116...n-read-178881/

TOYOTA 1

x3 on that pipe with the 2 bolt flange.. its an o-ring type gasket that goes in there.

Matt16

I tried finding the leak and simply couldn't!!!!!! That is to say, while it was dripping profusely (5-10 drips/min) at lunch, it didn't drip once on my driveway while I was watching. Going to take a look when the engine is cool tmr morning, to try to duplicate the situation when it was dripping at lunch.

I bought some Prestone Stop Leak pellets (also called rabbit turds I think, by old timers). If I can't find this leak, I'll be quite tempted to toss some of that stuff in next time it does leak.

abecedarian

Any kind of stop leak (alumi-seal, barrs, black pepper, raw egg ) is good for a temp solution but I've seen it plug up water pump impellers and radiator cores so don't let it go too long without fixing the problem.

Matt16

Yeah, that was frustration talking haha. I'm sort of surprised Prestone even sells that stuff, usually snake oils are sold by small brand names.

I found it. Embarrassingly, it was the upper rad hose- thermostat housing pipe connection. it was dripping onto part of my on board air system, running aft along a wire which touched the heater pipe Abe was speaking about and THEN dripping down. I was able to spot it in day light.

jht3

which one is this? is it the one called "pipe, water bypass #1"?. and is there a part number for the o-ring?

NYChopshop

This is NOT true! Maybe it would stop the leak very temporarily, but I wouldn't consider this a good solution at ALL! First off, let's just stop and think about putting pepper or raw egg into your radiator - your hopes are to have the egg cook itself, shred, and somehow stick in the hole causing the leak and plug it. This just plain doesnt work, and then you have egg in your damn engine block among other places. Now for the real big no-no: the 'add me in your radiator' sticks of radiator stop leak. These things will permanently coat your coolant system, you block's water jacket, internal water passages, hoses, thermostat, water pump... and it stays right where it is. Often it gums up your thermostat forcing a replacement, coats your radiator so it doesnt cool as well, and in order to get it off of the walls of your cylinder block, its a tear-down type deal. I have seen this junk caked all over the inside of engines before, its not worth it. I'm in school for master ASE certification as a collision repair tech, and when it comes to the right way to do things, my teachers take the time to beat certain concepts into my brain. This is one of the first big no-no's they taught us somewhere around the second week of training.