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

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Old 12-11-2011, 08:00 PM   #1 (permalink)
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Coolant disappeared but no leak!!?!!

So in the past week I have had to add over a gallon of antifreeze to my radiator and it keeps disappearing but I have no leak of any kind. Unless its internal. No oil in coolant and I'm not blowing any kind of smoke either. Any idea of where my coolant may be going? I'll be changing the plugs here in he next couple weeks so I'll do a compression check at the same time. What is considered a good compression range per cylinder for a 3VZE???
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Old 12-11-2011, 08:03 PM   #2 (permalink)
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If you place the type of truck you have in your signature, more folks might be willing to help.

I'd pull the plugs and see if there's anything strange looking(coolant) sticking to them.
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Old 12-11-2011, 08:23 PM   #3 (permalink)
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sorry, when you buy the plugs you should also buy a head gasket set.
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Old 12-12-2011, 01:15 PM   #4 (permalink)
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using coolant

your engine is burning coolant , time for an overhaul
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Old 12-12-2011, 01:24 PM   #5 (permalink)
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Great.......
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Old 12-12-2011, 02:54 PM   #6 (permalink)
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sorry, when you buy the plugs you should also buy a head gasket set.
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your engine is burning coolant , time for an overhaul
Jump to conclusions much?

I would start by replacing the radiator cap with OEM. It's probably spitting coolant into the overflow tank but the cap isn't air tight, preventing a vacuum from forming when it cools down. This vacuum is what pulls the coolant from the overflow back into the radiator.
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Old 12-12-2011, 03:55 PM   #7 (permalink)
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Didja check where the coolant return line comes out of the block? Mine has a small leak through the RTV that only drips when driving...

Also, do you have rear heat in your 4runner? If so, check those coolant lines under the truck. They are right in the middle, just beside the transfer case I believe.

Finally... I dunno how fast this one leaks, but there is a ****ing tiny little upside down U shaped hose behind the intake plenum on the 3VZE. It LOOOVES to develop pinhole leaks and piss coolant away at a not-so-negligible rate. Bitch to change but it can be done without removing the plenum.

Check those out, and let us know if that narrows it down!
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Old 12-12-2011, 04:05 PM   #8 (permalink)
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I have no leak of any kind.
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Didja check where the coolant return line comes out of the block? Mine has a small leak through the RTV that only drips when driving...

Also, do you have rear heat in your 4runner? If so, check those coolant lines under the truck. They are right in the middle, just beside the transfer case I believe.

Finally... I dunno how fast this one leaks, but there is a ****ing tiny little upside down U shaped hose behind the intake plenum on the 3VZE. It LOOOVES to develop pinhole leaks and piss coolant away at a not-so-negligible rate. Bitch to change but it can be done without removing the plenum.

Check those out, and let us know if that narrows it down!
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Old 12-12-2011, 04:17 PM   #9 (permalink)
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Did you check all the sparkplugs? Is the coolant in green? well it should be. Anyways if its using coolant through a internal leak of some sort for example a bad head gasket, you might see a light green color on the plugs? Where else could it be going? if it aint leaking anywere? its using it somwhere else, other then decorating your parking space.
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Old 12-12-2011, 04:31 PM   #10 (permalink)
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Is the coolant in green? well it should be.
FYI, Totota OEM coolant is RED, not green .
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Old 12-12-2011, 04:35 PM   #11 (permalink)
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coolant

waahht oem mabe but i doubt hes going to the dealer for a gallon of coolant every week.
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Old 12-12-2011, 04:38 PM   #12 (permalink)
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Where else could it be going? if it aint leaking anywere? its using it somwhere else, other then decorating your parking space.
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I would start by replacing the radiator cap with OEM. It's probably spitting coolant into the overflow tank but the cap isn't air tight, preventing a vacuum from forming when it cools down. This vacuum is what pulls the coolant from the overflow back into the radiator.


When the overflow is full, it spits out what it can't hold. This usually occurs while driving so you wouldn't notice it on the ground when parked.

Replace that radiator cap!
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Old 12-12-2011, 04:41 PM   #13 (permalink)
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Nah, he only goes for coolant every other week since a gallon of Toyota Red gives him two gallons of mix. Green or red, he needs to track down the problem(s).
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Old 12-12-2011, 04:43 PM   #14 (permalink)
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When the overflow is full, it spits out what it can't hold.

Replace that radiator cap!
And, check the overflow tank for cracks.
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Old 12-12-2011, 04:46 PM   #15 (permalink)
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Ok ,check the reserve or overflow containment unit. That little plastic container towards the front when you open the hood its on your right side look in there w a flashlight check for frogs. if they are swimming or one jumps out you is good!
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Old 12-12-2011, 04:47 PM   #16 (permalink)
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Also check that the hose hanging in the overflow isn't clogged...if it is it will just spit the coolant out instead of into the tank.
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Old 12-12-2011, 05:25 PM   #17 (permalink)
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I went and pulled the overflow tank and cleaned it and blew out the hoses and rinsed them out as well everything looked ok. Rinsed it all out filled it back up. I'll replace the cap next week. Pulling plugs tomorrow morning.
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Old 12-12-2011, 05:43 PM   #18 (permalink)
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Have you checked the water pump? Take a careful look around the engine at the head/block interface for any coolant crusties especially right after you kill the engine....it may be seeping someplace only when it's hot and cooking or blowing off making it hard to find.

How does the oil look?
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Old 12-13-2011, 02:23 PM   #19 (permalink)
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Pulled the plugs today and holy crap they where the nastiest plugs I have ever seen... Compression was between 145psi and 150psi in every cylinder
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Old 12-13-2011, 03:37 PM   #20 (permalink)
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plugs

sounds like your on the right track.
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Old 12-13-2011, 03:37 PM
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