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Heater Hose Routing

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LARIAT 85

Heater Hose Routing

I would like to replace my heater hoses, due to a small crack that is seeping a tiny amount of coolant. I noticed that Ford crossed the heater hoses before they connected to the heater core. Does anyone know why? I routed mine parallel, and didn't seem to have a problem?

http://www.garysgaragemahal.com/heater-hoses.html

Lucille: 1985 Ford F150 XLT Lariat

*Colors: Dark Canyon Red exterior, Canyon Red interior
*Engine: 5.0, CompCams 31-230-3, "Thumper" E7 heads, Edelbrock Performer intake, Autolite 4100 carburetor, DuraSpark II ignition, Thorley Tri-Y headers, Flowmaster dual exhaust, H-pipe.
*Drivetrain: AOD transmission, 3.55 gears, 2wd.

Rembrant

Re: Heater Hose Routing

Well, there'd be no hydraulic difference with the lines crossed (or not crossed). I'm guessing there's no reason for it.

1994 F150 4x2 Flareside. 5.0 w/MAF, 4R70W, stock.
1984 F150 4X2 Flareside. Mild 302 w/ 5spd. Sold.
1980 F150 4X4 Flareside. 300i6 w/ 5spd. Sold in 2021.
1980 F100 4X2 Flareside. 351w/2bbl w/NP435. Sold in 1995

1986F150Six

Re: Heater Hose Routing

Administrator

I am guessing the order had something to do with ease and speed while coming down the assembly line.

Steve83

Re: Heater Hose Routing

Banned User

In reply to this post by LARIAT 85

Look closer... They're crossed twice. The lower hose crosses the 18663 nipple.

But it doesn't matter, and it's actually better for the heater core to reverse them every few years. This truck DIDN'T get that treatment, until yesterday:

Rembrant

Re: Heater Hose Routing

In reply to this post by LARIAT 85

I happened to come across this diagram in the '84 FSM today, and it shows the hose orientation at the heater core as "Optional".

Gary Lewis

Re: Heater Hose Routing

Administrator

Good find, Cory! Mind if I use that on the Cooling System/Heater Hose page?

Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

Rembrant

Re: Heater Hose Routing

Gary Lewis wrote

Good find, Cory! Mind if I use that on the Cooling System/Heater Hose page?

No problem here Gary, it's just a snip from the 1984 manual. There's one for the 300 as well. I didn't think that the routing mattered much, but I remember wondering about it myself when putting my engine back in, and I've seen others ask as well.

Gary Lewis

Re: Heater Hose Routing

Administrator

Cory - Check out the page at Documentation/Cooling Systems/Heater Hoses.

Gary, AKA "Gary fellow": Profile

Rembrant

Re: Heater Hose Routing

Gary Lewis wrote

Cory - Check out the page at Documentation/Cooling Systems/Heater Hoses.

Nice!