LC HDJ80L with 1HDT Engine (1 Viewer)

[xna0329]

Hi everyone,
I just picked up my first LC80 and have been going through some maintenance items to get everything up to speed. I realized the HDJ80 with the 1HDT engine and left-hand drive isn’t too common here in the U.S., so I figured I’d reach out for some advice.
I recently found a coolant leak coming from the hose that leads to the rear seat heater. That got me thinking it's probably time to do a full coolant flush. While I was under the rig, I noticed something odd and was hoping someone could help me identify what I’m looking at (please see picture #1). It looks like there’s a condenser in front of the radiator (silver-colored—maybe a transmission cooler?), there are two large pipes connect to the silver condenser and running across the vehicle from left to right through the wheel wells (Pic #2 & 3). They already show slight rubbing, which is a bit concerning. Then there’s another condenser-like unit underneath that and the radiator (Pic #4). I’m not sure what that is.

I found a hole on the driver-side at the bottom corner of the radiator (Pic #5), can anyone confirm that is the coolant drain plug?

Any insight would be really appreciated—thanks in advance!

 

[TurboDennis]

That big silver thing is your air-to-air intercooler. A popular aftermarket upgrade for turbo-diesels.

Coolant leak is likely coming from the metal lines that run down the firewall/tranny tunnel and connect to the rear heater core (under the passenger seat). They rust out and leak often. Not easy to replace - most people either bypass the rear heater completely, or replace the metal lines with rubber ones.

And yes, last pic looks like the radiator drain tube.

 

[xna0329]

That big silver thing is your air-to-air intercooler. A popular aftermarket upgrade for turbo-diesels.

Coolant leak is likely coming from the metal lines that run down the firewall/tranny tunnel and connect to the rear heater core (under the passenger seat). They rust out and leak often. Not easy to replace - most people either bypass the rear heater completely, or replace the metal lines with rubber ones.

And yes, last pic looks like the radiator drain tube.

That big silver thing is your air-to-air intercooler. A popular aftermarket upgrade for turbo-diesels.

Coolant leak is likely coming from the metal lines that run down the firewall/tranny tunnel and connect to the rear heater core (under the passenger seat). They rust out and leak often. Not easy to replace - most people either bypass the rear heater completely, or replace the metal lines with rubber ones.

And yes, last pic looks like the radiator drain tube.

So the airflow goes from the intake to the turbo, then through the intercooler, and finally into the engine? No wonder the piping is so large! And another dummy question, there is no valve at the radiator drain tube, it is just a drain tube seems like. How can I drain the coolant? Thank you!

 

[TurboDennis]

So the airflow goes from the intake to the turbo, then through the intercooler, and finally into the engine? No wonder the piping is so large! And another dummy question, there is no valve at the radiator drain tube, it is just a drain tube seems like. How can I drain the coolant? Thank you!

Air goes from the OUTLET of the turbo to the intercooler, then to the intake manifold.

The valve to drain the coolant is facing the engine on the radiator (near that drain nipple). It's in a really awkward spot and hard to see/reach.
If you're gonna use it, you should get an appropriately-sized rubber hose and slip it onto that nipple in your picture, through the hole in the crossmember. If you don't do this, coolant tends to drain onto the crossmember, and makes a huge mess. And it takes forever. Personally i never bother, and just disconnect the lower hose on the radiator to dump coolant fast.

 

[xna0329]

Air goes from the OUTLET of the turbo to the intercooler, then to the intake manifold.

The valve to drain the coolant is facing the engine on the radiator (near that drain nipple). It's in a really awkward spot and hard to see/reach.
If you're gonna use it, you should get an appropriately-sized rubber hose and slip it onto that nipple in your picture, through the hole in the crossmember. If you don't do this, coolant tends to drain onto the crossmember, and makes a huge mess. And it takes forever. Personally i never bother, and just disconnect the lower hose on the radiator to dump coolant fast.

I am going to do the same!!! Any guess on that radiator looks unit underneath the air-to-air intercooler and radiator?

 

[TurboDennis]

Sorry, i can't see anything on your pictures. The only cooler that should be there (from the factory) is the power steering cooler, but it's basically just a metal tube without any fins (and looks nothing like a radiator). It's possible that it was replaced with an aftermarket one.
If you're not sure - just follow the lines connected to it and see where they lead...