Major coolant leak...but from where??

sluggo42

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Aug 9, 2007
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Is there some hose or something behind the thermostat housing, or right below it?
I took off hard the other day, only to hear a big gooosh, and see a big white mist behind the car as a bunch of water/coolant exited the vehicle in a hurry. I pulled her over and had her towed home. I took off the air piping stuff, replaced the lower radiator hose, as that was what I thought it was. It seems like the water is leaking out right where the lower radiator hose enters the block, right under the power steering reservoir.
Anyways, I started filling it back up, but when I got about a gallon in, coolant started falling out of something. But there is so much junk in there, I cant see whats back there.

Any ideas??????????/

Thanks in advance guys!

Doug
 

Asterix

Lurker of Power
Mar 31, 2005
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There's a pesky little right-angle hose (#16283) back in there, behind the thermostat housing that likes to split. It is hard to see and annoying to replace. I've taken an old one to a regular auto parts store and matched a section of molded hose rather than buy a new one from Toyota.

Asterix
 

Who

Supramania Contributor
That 90deg hose will dump your coolant in 10 seconds flat. I found that you can remove the power steering reservoir at least move it to the side and replace the hose much easier. Reuse the factory constant pressure clamps. There isn't enough room to tighten a hose cutting worm clamp. While you are there replace the 90deg 16285 and the straight coolant hose 16284 that goes too and from the turbo. You will find another 90deg hose at the back of the head 16282 from the diagram above. That one should be changed as well. By the way Napa carries all the hoses necessary and they are made by GATES. One of the senior members suggested putting heat sleeve over the two small turbo coolant hoses as well. Take aleve as directed for your aching back as well.

Pipe to Thermostat NBH7296
90 turbo coolant Item#: NBH10030
straight line turbo coolant hose buy in bulk
 

sluggo42

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Aug 9, 2007
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Asterix;1412998 said:
There's a pesky little right-angle hose (#16283) back in there, behind the thermostat housing that likes to split. It is hard to see and annoying to replace. I've taken an old one to a regular auto parts store and matched a section of molded hose rather than buy a new one from Toyota.

Asterix

What is the heck is a hose back there for?
I see it and it's split, but I am wondering how in the world I'm going to get to it.?
It's behind the power sterring fluid reservoir, right above the rad hose going into the block. I really am beginning to wonder how in the world I'm going to get it out.
If I screw the lid onto the power steering fluid reservoir, can I unhook it from the mounting bracket and lean it over towards the fenderwell, or do you suppose the hoses will break?
Who designed putting this hose here anyways? Jeepers, it's like the stoopidist place to put a hose on the planet!!
 

Who

Supramania Contributor
Remove the accordion hose air filter box and PS reservoir. Get lots of rags. Try and suck the fluid out of the PS reservoir with a old turkey baster or a gear oil hand pump makes it less messy. Unhook the PS reservoir from both hoses and set it aside. Now you will have plenty of room to work at the 90 deg hose. There is a metal heat shield plate next to the hose. Don't bend it or break it off. Replace all your hoses. Now follow this link and perform a maintenance on your power steering system. Bang!!! you just killed four birds with one stone. If your going to get dirty get dirty once. You can do it!! Trust me your worst attempt will still beat any shops attempt any day.
 

sluggo42

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Who;1413039 said:
Remove the accordion hose air filter box and PS reservoir. Get lots of rags. Try and suck the fluid out of the PS reservoir with a old turkey baster or a gear oil hand pump makes it less messy. Unhook the PS reservoir from both hoses and set it aside. Now you will have plenty of room to work at the 90 deg hose. There is a metal heat shield plate next to the hose. Don't bend it or break it off. Replace all your hoses. Now follow this link and perform a maintenance on your power steering system. Bang!!! you just killed four birds with one stone. If your going to get dirty get dirty once. You can do it!! Trust me your worst attempt will still beat any shops attempt any day.

nah, way too much work for a sight challanged 55 year old. I got the hose out, and am going to my local NAPA for a replacement...
I do believe this is the oiliest dirtiest area of this engine by all means!
At least I now have a few more new cooling hoses for my DD
 

ForcedTorque

Join the 92 Owners Group
Jul 11, 2005
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55? C'mon man, that's not old! I'm 43, and I have been working on one Supra or another for the last 4 years almost non-stop.

If that hose is real oily, you may want to also check the O-ring on your Cam Position Sensor (CPS/distributor). You'd need to study the instructions on that one though. Or, your valve covers could also be the culprit.
 

sluggo42

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Aug 9, 2007
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ForcedTorque;1413117 said:
55? C'mon man, that's not old! I'm 43, and I have been working on one Supra or another for the last 4 years almost non-stop.

If that hose is real oily, you may want to also check the O-ring on your Cam Position Sensor (CPS/distributor). You'd need to study the instructions on that one though. Or, your valve covers could also be the culprit.

lol, a lot goes wrong from 43 to 55 my friend, trust me, it ain't pretty.
But, all has been completed, and she is bac k on the road.

An immense thanks to you guys for the help in pinpointing the problem. It was an all day pain in the butt, but we are solid again.

This site is great!