Hello,

I’ve looked on lmc truck and cant find a diagram to identify this line that connectors to the radiator fill cap. Anyone know what this is? Provide a diagram?



Truck is a 1994 F150 5.0 302 AT 4x4
I do not know the radiator specs, it definitely is not the original when vehicle was built, plastic looks newer on it. I bought the truck a month ago.

 

I don't, but @Steve83 probably does.

He might have questions for you before he can answer though.
Things such as what are you working on beside "a radiator". Year and motor perhaps? Just in case there was a design change in the 9 year span.
The 1993 302 I owned had a different radiator and fan than a coworkers 1996 I think it was. I had a thin radiator with a 5 blade metal fan vs a double row 8 blade plastic fan (Or maybe it wasn't 8 but can't recall). The important part is the 2 trucks had different radiators.

 

It's the return tube (for E4OD applications only) from the throttle warmer.

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It's not special - the whole thing from the throttle body to the radiator can be replaced with common 1/4" coolant hose, or you can cut off the Aluminum swage collars & replace only the rubber sections using common screw clamps. But many people simply delete the throttle warmer by plugging the hose coming up from the intake nipple, and also capping that nipple on the radiator. It's only needed under certain rare weather & engine-load conditions that can potentially lock the throttle open with ice inside. I've never heard of it actually happening.

Put ALL the truck's details & history into your signature as this page explains, so we can review them with each reply:

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That solves my question of a radiator I was looking at that summit racing had as a direct replacement, in the picture that line in question was plugged off. Which left me scratching my head as far as compatibility.

 

Anyone who wants/needs that nipple open can simply drill it open.

 

Would this line contribute to the mass amounts of black sludge coating 2mm thick on the throttle body walls?

 

No, it's a coolant hose and I already told you what it does. It doesn't dump into the throttle body's airstream. That sludge (depending on what year the truck is and how it's built - put ALL its details into your signature ) comes from the PCV & EGR, and doesn't hurt anything unless there are other problems that need repair.

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