Antifreeze dripping off transmission

Okay, replaced the radiator yesterday, seems to be all good, holds a constant temp.

I came home from work (I drive another vehicle for work) and noticed a stain under the truck that wasn't there yesterday. It's coming right straight down the bell housing seam, where the bell housing bolts to the tranny, on the passenger side only.

I looked up there with a light and can't find a source, tranny is dry on top, antifreeze drip is running down the side...it's definitely antifreeze, I can smell and taste it.

Any ideas?

I just went out and rinsed it all real good, but I can't for the life of me figure how it could be leaking from back there.

Heater core anywhere in that area?

 

I wouldn't worry about it man. Check the level and you should it actually become an issue then take care of it.

 

So I rinsed it off,took it for a drive and its dry. I may have panicked
I'll mention it if it happens again. I did find the heater hoses and they were dry...

 

Freeze plug on the rear of the block rusting out.

 

That did cross my mind

This crossed it too...however there is no rust on this truck, and a healthy coating of 10w-40 on the rear of the block.

 

One other thing.
There is also the "coolant by-pass pipe" that has a habit of leaking on older engines. It is under the intake manifold and can't be seen other than it's extreme rear portion. They tend to leak at the block connection towards the front. This slowly fills the "valley" between the 2 cyl heads and eventually drips down the back of the block. These things can go unnoticed for years if the coolant dries up before it accumulates enough to spill out at the back.

Pics in post #3 and #14

 

Thank you for the link and those pics, very informative. I hope that ain't it.

This mornings inspection showed all dry surfaces and no drip mark for now.

 

well shit, drip mark is back. Again, top of tranny is dry but dripping down the side.

Popped the hood and noticed dripping off this...


It's coming right out of the arm itself, so I guess I'll start here and replace it.
Thanks for all the suggestions, I'll post back after I replace that and let you know if it did the trick.

 

$150.00 and some change from Toyota...
Checking around...

Edit: Napa has it in stock for $55.56.

 

If that doesn't work try looking at the water pump weep hole for signs of leakage

Happened to me with my 2002

Every time I washed the engine off and drove the truck the fluid showed up somewhere else ... At first I thought it was coming from the oil cooler on the left side of the engine block but then it was dripping down the transmission on the right side ... Turned out to be a water pump going bad

Changed water pump (and timing belt too) and leak went away

 

That thought occurred to me too, and I happen to be due for timing belt and of course water pump...
anyway, I replaced the valve today. Before I did, I left the hood up and started the engine and the drip was very pronounced until the engine warmed up then it stopped.
It just happened to have a clear drop to the side of the tranny and left no evidence anywhere else, so it was kind of hard to understand where it was coming from, usually there is a drip path or something.

 

ive had the same problem on my 98 2.7 tacoma. its the heater control valve it leaks out of the shaft that the arm and cable connect to. ive replaced it 3 times now and it seems that the valves from oreillys lasts about a year then leaks again. luckily they have a warranty so each time they have given me a new one. it may be worth the extra $ to get it from toyota, but if you dont mind replacing it each year then spend $55 and keep bringing it in on warranty like me ha.

 

I had the same problem on my wife's 99 2.7 L. Replaced the valve twice with one from O'Reileys. It leaked both times depending on where the lever was situated. With the truck running and the heater on slowly move level back and forth. It was about an eight of inch difference in one spot that leaked to the spots that did not leak. I finally purchased an OEM part from and there have been zero issues. Parts were purchased Gary at Newman Toyota. I have made several purchases from Gary and he has been great to work with and super helpful either by email or phone.
[FONT=&quot]Gary Smith[/FONT]
[FONT=&quot]Parts Manager[/FONT]
[FONT=&quot]Toyota of Newnan[/FONT]
[FONT=&quot]2 Herring Road[/FONT]
[FONT=&quot]Newnan, GA 30265[/FONT]
[FONT=&quot]678-854-9601[/FONT]
[FONT=&quot]F 678-854-9609[/FONT]
[FONT=&quot]www.toyotaofnewnan.com[/FONT]

 

I do a fair amount of driving out away from it all. For peace of mind for me, I would go with the OEM part. Heating/cooling/defogging specific part there.

Damn block crossover on my 22r leaked profusely, replaced that gasket several times. Crossover was cracked. OEM at the time (88ish) was $112 and no J Yard would strip one off a block. J Yard prices were in the $120+.

Nothing at all wrong with specific OEM Toyota parts. Expensive? hell yes!. But 9 out of 10 they last the lifetime,,or more.

Seemingly overlooked piece of the puzzle is the radiator cap,,make sure it vents off pressure like it should,,and that the overflow tube is clear,,so it can vent. If not,,bad juju can happen all over the cooling system and you will chase your tail trying to find it.