ARCHIVE 1FZ-FE coolant flow and planning

[OGBeno]

My impression is that these are more detailed than the FSM and of course include part numbers – – which saves a lot of time on the phone.

I think the inherent point here is that you do business with Joey when you need something off of the poster. That's called "supporting the community and supporting those that support you."

It used to not have to be said in the LC world. It was a tacit understanding.

But that's not the case anymore--to the detriment of the community-- unfortunately.

 

[COYS]

I think the inherent point here is that you do business with Joey when you need something off of the poster. That's called "supporting the community and supporting those that support you."

It used to not have to be said in the LC world. It was a tacit understanding.

But that's not the case anymore--to the detriment of the community-- unfortunately.

Get off my lawn! Jk

 

[jaymar]

I think the inherent point here is that you do business with Joey when you need something off of the poster. That's called "supporting the community and supporting those that support you."

It used to not have to be said in the LC world. It was a tacit understanding.

But that's not the case anymore--to the detriment of the community-- unfortunately.

I have done business with Joey (can't POSSIBLY tell you how helpful he's been), and w /you and cdan. Helps to know what part I'm asking for. Saves me time, saves you time. (*Scratches head*) Also, I started replacing hoses months ago. If I saw more LCs driving past I'd put up a sign: WITS' END / BUY FROM JOEY!

 

[NLXTACY]

Nice job Joey. Can we get one detailing the rear heater bypass option and the rear heater hard line bypass?

All you need now is to have someone create a GIF showing the flow to make it faster to read

Yeah thats next on the list. If someone wants to make the GIF I'll give the vector files. I'm not going to bother

 

[SteelHunterFJ80]

I think the inherent point here is that you do business with Joey when you need something off of the poster. That's called "supporting the community and supporting those that support you."

It used to not have to be said in the LC world. It was a tacit understanding.

But that's not the case anymore--to the detriment of the community-- unfortunately.

Amen. Totally agree

 

[FlyingDevil42]

Replacing my phh as well as some other cut lines and came across this. It’s a P.O. mod. Does anyone know what this is? My plan is to just replace with an oem hose and remove this. Thanks!

 

[fz1boxer]

Looks like a heater installed in the wrong place

 

[Heckraiser]

that's where a lot of people are installing the probe for an aftermarket water temp gauge.

 

[danthman114]

to read temps. it could also control an electric fan. it will turn the fan on automatically or for a temp gauge...

 

[Will Van]

Agreed with above. Temp sensor/controller.

This is really the way to plumb it if you want an aftermarket temp sensor. Drill and tap upper water pipe for 1/8” NPT. It has a flat spot that looks like it was designed for such use.

 

[fz1boxer]

is the cable attached to a fan or does it have a 3 prong plug on the end

 

[FlyingDevil42]

is the cable attached to a fan or does it have a 3 prong plug on the end

Still chasing the end. It’s routed down then thru the bumper into the frame. Haven’t found where it comes out and I don’t have any extra gauges inside.

 

[Dubbinchris]

Still chasing the end. It’s routed down then thru the bumper into the frame. Haven’t found where it comes out and I don’t have any extra gauges inside.

Looks to me like a lower radiator hose heater installed in the wrong place. I'm betting you'll find a three pronged household plug at the other end of that wire.

 

[danthman114]

Is there a pusher fan on it?

 

[FlyingDevil42]

Found the end. Just inside of the the bumper. Thanks for the input.

 

[fz1boxer]

Yep those things are an accident waiting to happen

 

[fz1boxer]

FL climate is to warm for one of those..................

 

[GENEVAJOE]

I am starting this thread in order to make life easier for a few folks. I will be posting diagrams up here so that they can be used as reference but also because it helps to detail what hoses and how many clamps and what if you re-route and what if, what if. I will try and detail what I can. Please scrutinize all you want and I will adjust the drawings as needed.

First up is the 1FZ-FE coolant routing for 95-97 engines. Everything in yellow is pipe and everything in red is a rubber hose. Clamps are shown as is the coolant flow.

View attachment 1752010

Hi I'm new to this forum. I'm currently working on a 1995 LC with the 4.5L. The vehicle has no heat unless you keep RPM's above 2500, then it's luke-warm at best. I have had the dash out twice, installed a copper recored heater core, insulated the plenum, made absolutely sure the blend doors are operating correctly, replaced the heater water valve and thermostat, removed and inspected the water pump (it's been recently replaced). Also, the rear heater core has been bypassed, the pipes with tees completely removed. At one point I installed clear hose between heater core and water valve and observed the flow of coolant. It was flowing from rear of the head and passed thru water valve R to L and into heater core, out core, thru pipe down to back of thermostat housing. Your diagram shows arrows pointing away from both the inlet AND the outlet of the core. My latest effort was to install an auxiliary water pump in the heater hose between valve and core, but this actually made even less heat, so I'm going to turn the pump around to push coolant in the opposite direction of what I observed. Is it possible that the coolant is flowing in the wrong direction on this engine? If so, why?

 

[ppc]

What is the vehicle history? Is this new to you, did it ever produce heat?

 

[GENEVAJOE]

What is the vehicle history? Is this new to you, did it ever produce heat?

This is a good customer. He bought the truck online from California? As soon as he got it he took it to an accessory place and had a lift kit, wheels and tires, backup camera, nav system, new bumpers, etc. installed. Then he only had been driving it a week when he brought it to me for no heat and a couple other minor things. The cooling system was dirty so flushed it.