Coolant leak 80 series

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M

mtlandcruiser

Joined
Feb 28, 2021
Threads
13
Messages
71
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home
Found about 2oz of coolant underneath the LC. I wiped it all clean it seems as if it is coming from a plastic rectangle in the transmission, problem is I cant get it it to leak again drove 30 miles.
Any ideas or explanations. I'm a rookie.

Lol , yesterday I repaired a transfer case leak and woke up to this today. As well as a power steering leak.
I really am baffled.
 
mtlandcruiser said:
I pulled and squeezed on every line by the firewall cant get a leak to occur.
Click to expand...


For leaks that aren't readily found.....pressure test the system....and then look.

Pressure Test01.webp
 
Also I have had the LC in the garage I have it about 53 days. Last night i left on driveway.
Could it be a temperature thing? It was cold
Central nj
 
If you said its coming from the transmission then it is probably leaking over the top of the transmission. A pressure test would be the quick way to find exactly where it is. Here is a photo of the heater lines on my LC. I bypassed them preemptively due to their condition. Its the two pipes running in tandem and the one flex hose on the outside of the frame. It goes up under the passenger seat above the cat heat shield.
20210320_163812.webp
 
Sandy Cruiser said:
If you said its coming from the transmission then it is probably leaking over the top of the transmission. A pressure test would be the quick way to find exactly where it is. Here is a photo of the heater lines on my LC. I bypassed them preemptively due to their condition. Its the two pipes running in tandem and the one flex hose on the outside of the frame. It goes up under the passenger seat above the cat heat shield.View attachment 2620580
Click to expand...
By doing this what did u lose?
 
Did a pressure test while the LC was off. immediately there was a leak.

The leak looks like it is coming from above the fuel filter it looks like a soft line line going into the block. Iam not confident that this line is a coolant line it may be a breather it has a small clamp and I cannot get a nutdriver /socket/screwdriver on it
It is not 100% tight
 
Sounds like the PHH (Pesky Heater Hose) or the the coolant bypass hose (smaller diameter) a bit forward of the PHH.

Try some searches (upper right magnifying glass icon) for PHH
 
Last edited:
Is this it?

forum.ih8mud.com

PHH OEM style close up pics

I changed out my PHH today. Took a long time. I don't know how some guys get this done in a couple of hours -- took me all day. With so many great write ups out there I am not going to attempt another complete description, but grabbed some close up pics that might help the next guy. Note...
forum.ih8mud.com forum.ih8mud.com
 
Sandy Cruiser said:
Is this it?

forum.ih8mud.com

PHH OEM style close up pics

I changed out my PHH today. Took a long time. I don't know how some guys get this done in a couple of hours -- took me all day. With so many great write ups out there I am not going to attempt another complete description, but grabbed some close up pics that might help the next guy. Note...
forum.ih8mud.com forum.ih8mud.com
Click to expand...
Yes it is. To the front of the PHH
I just dumped about 1/2 gallon of antifreeze on my self.
Does anyone know the 2 gray wires that go into into the sensor by the fuel pump I pulled them out by accident.
It looks like it belongs to some sort of sensor.
 
mtlandcruiser said:
Yes it is. To the front of the PHH
I just dumped about 1/2 gallon of antifreeze on my self.
Does anyone know the 2 gray wires that go into into the sensor by the fuel pump I pulled them out by accident.
It looks like it belongs to some sort of sensor.
Click to expand...

Screenshot_20210324-173928_Samsung Internet.webp
 
Knock sensor #2 (same part as knock sensor #1). They're known to be brittle
and snap off very easily; some people remove the knock sensor before working
on the PHH for that reason. O'Reillys use to carry a Made in Japan part that was
the same as the OEM part, not sure if they still carry that line however.

forum.ih8mud.com

Another busted Knock sensor connector

Recently found the #2 Knock sensor connector to have snapped off, the connector was just loosely hanging on the knock sensor, the tip off was an intermiitent loss of power. So the sensor connector piece was stuck inside the harness connector and after a few tries was unable to remove the stuck...
forum.ih8mud.com forum.ih8mud.com
 
Last edited:
Looks like your lines are as Krusty as mine. I like having it though.
Sandy Cruiser said:
If you said its coming from the transmission then it is probably leaking over the top of the transmission. A pressure test would be the quick way to find exactly where it is. Here is a photo of the heater lines on my LC. I bypassed them preemptively due to their condition. Its the two pipes running in tandem and the one flex hose on the outside of the frame. It goes up under the passenger seat above the cat heat shield.View attachment 2620580
Click to expand...
 
Can someone help me with a procedure to pressurize or vacuum test only my heater core? I think its got a leak because the prior owner bypassed the rear heat and the front heat. I just want to get the front heat back but want to make sure the thing is solid before i run all the hoses and coolant through it. If i just connect the pressure/vacuum to the top most heater core pipe on the passenger side, and plug the top most heater core pipe on the drivers side, that would be the correct way to accomplish this, correct? Also, my AC works great, so not sure if thats any indication that the heater core is good?
 
togles said:
Can someone help me with a procedure to pressurize or vacuum test only my heater core? I think its got a leak because the prior owner bypassed the rear heat and the front heat. I just want to get the front heat back but want to make sure the thing is solid before i run all the hoses and coolant through it. If i just connect the pressure/vacuum to the top most heater core pipe on the passenger side, and plug the top most heater core pipe on the drivers side, that would be the correct way to accomplish this, correct? Also, my AC works great, so not sure if thats any indication that the heater core is good?
Click to expand...
As I have bypassed my front heater core because of a leak… I can only assume the reason your PO bypassed was because the heater core was leaking. It seems to be quite the tedious job because you have to remove the entire dashboard and all the little screws just to get to it. I haven’t attempted it yet…

Check right about where your passengers left foot would rest at, if there is staining on the carpet, your heater core more than likely has a leak. I can’t imagine anyone bypassing the heater core for any other reason, but I’m no mechanic.
 
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