Need a little guidance on heater hoses- Denver Area

[Fisher67]

Well I got the heater installed in the FJ43. By heater, I mean the blower, the actual heater box, ducts, defrost hoses, heater valve, and operating pulls. What I don't have done is the heater hoses to get warm fluid into the core. Since my FJ43 never had a heater before, there are no obvious "Y" connections on the radiator hoses to tie into. Looked on the internet and on this site, but could not find any guidance of how to attach the hoses. The heater I bought from a MUDer (Thanks Butch!) had everything including the short hoses and copper elbows that hook up to the heater core and pass through the firewall. The original hole in the firewall is currently blocked by the "Colombian Lock Out" which has a key that can prevent theft by not allowing the vehicle to run with the key out of the circuit. I figure that I need to remove this and use the hole to run the heater hoses, but have no clue what type of 'Y" to buy to tap into the radiator hoses. Any guidance? I live near the Cherry Creek Mall if there are any local cruiser experts that want to give me a few pointers?

Best,

Todd
303.886.0533 cell

 

[78fj40mg]

Todd, you will need a heater valve to control flow of water here's a pic

piping diagram

I hope this helps.

 

[diogenese]

Bottom hose and the back of the head on one of mine

 

[Fisher67]

Mike,

I got a heater valve and attached it to the firewall and even got the cable attached to open and close it. Just need to figure out where to buy a "T" fitting to tap into my hot water system.

Thanks!

Todd

 

[78fj40mg]

Mike,

I got a heater valve and attached it to the firewall and even got the cable attached to open and close it. Just need to figure out where to buy a "T" fitting to tap into my hot water system.

Thanks!

Todd

Todd, these systems have a supply a return piping so you will need a T like this FJ40 Land Cruiser Heater hose return line union

 

[78fj40mg]

Here's a pic of the supply and return pipes.

The return connects to the lower radiator hose with the T connector, the supply comes from the left rear side of the engine right off the head there's a port with a nipple to connect a hose and run to the supply side of the heater valve.Sorry about the bad pic.

 

[Fisher67]

Thanks gentlemen for all the pointers! Bought a "T" from CCOT today and can see where I mount it in the lower radiator hose. Do I need to find the brass tube that bolts to the motor to bring water into the heater, or just run hose instead? From the helpful photos you provided, it looks like the supply comes out of the fitting in the block, and goes up to the valve, where it can be routed through the heater core or shut off, and then the return dumps back into the "T" in the lower radiator hose? Sorry for the dumb questions, but I am not too handy with mechanical thinking.

Thanks!

Todd

 

[73FJ40]

A hose to return the fluid to the tee is fine - that's what was used up until the mid 1970's (my '73 has only a hose). For this hose arrangement.

The concept of coming off the top of the block to supply the heater (hottest water) and having a tee in the lower radiator hose is to maximize flow. The lower hose is actually the suction to the water pump, basically the lowest pressure in the system.

Also note that the standard arrangement for the lower radiator hose has two pieces, one on each side of the tee, in case you have problems trying to fit the tee into your original one piece hose.

 

[Fisher67]

If this is the place in the block where I tap into the hot water, do I need the adapter or just the joint ? Trying to order all the parts in need for the install.

Thanks!

Todd

 

[diogenese]

No, that is the drain for the block. You need to use the port on the left rear of the cylinder head, just behind the temp sensor.

 

[78fj40mg]

If this is the place in the block where I tap into the hot water, do I need the adapter or just the joint ? Trying to order all the parts in need for the install.

Thanks!

Todd

This is the location

If this is the place in the block where I tap into the hot water, do I need the adapter or just the joint ? Trying to order all the parts in need for the install.

Thanks!

Todd

This is the port you need

 

[Fisher67]

Still working on getting the hoses in the right place. Got the T fixture for the lower radiator hose. Trying to figure out where to tap into the hot fluid to run through the valve and into the heater core. Took a couple of photos of what my engine looks like. I think there is a hose coming from the block, but it looks like it runs into an exhaust manifold under the carb? Anyone with a hint for me? Do I install a splitter off this hose and use it for the supply?

Thanks,

Todd

 

[diogenese]

In the second picture, behind the master cylinder you can just see the red top of the temp sender unit. Between that and the firewall will be a bung that you can swap for hose tail that will be the feed to your heater.
The hose in the same pic is the crankcase ventilation hose and doesn't have any coolant in it unless your engine is VERY sick!

 

[Fisher67]

I think I am getting this figured out. Thanks to everyone for their input and guidance. I ordered a joint that will screw into the port on top of the block aft of the temp sensor. Also ordered hoses and clamps, so should be piecing this together this weekend. I am sure that I will loose a lot of coolant when I put in the T on the lower radiator hose. Any suggestion on how to minimize the loss and how to fill it back up adequately to cover the amount that will now be in the new hoses and radiator core?

Thanks,

Todd

 

[micruz60]

Just to be clear, you put the hose tap as pictured in post #11 into the cylinder head, not the top of the block. For the coolant use a big bucket or a small plastic tub, capture as much as you can, draining from bottom of radiator or where the T section goes. Filter thru cloth and funnel to re-use.

 

[Fisher67]

So I remove the bolt from the port right behind the temp sensor and use this to feed the supply for the heater, through the valve?

Thanks,

Todd

 

[78fj40mg]

So I remove the bolt from the port right behind the temp sensor and use this to feed the supply for the heater, through the valve?

Thanks,

Todd

That's the one, go for it.

 

[diogenese]

 

[Weber Sarge]

I've found a neat trick to burping the cooling system when refilling - get at least a couple gallons into it and back the rear axle into a deep ditch , so the truck is sitting around 45 degrees . At this angle it removes those bubbles easier with the water pump . Just keep filling and it will burp but it does make a sticky mess out of the engine from the fan . A quick shot of Simple Green and some clean water - it's all good .
Sarge

 

[GA Architect]

If you don't have a deep ditch near buy.....purchase one of these kits: Lisle 24680

.....much less messy!