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Discussion Starter · #1 ·
I have a 1997 Ford Taurus 3.0L EFI 6cyl and I'm looking to install the Prestone Flush N Fill Kit, but I don't know which is the Heater Inlet Hose. I'm guessing one of the hoses in the pictures I listed is it. Can someone please point out which one it is or if I'm completely off base. CIMG0044.jpg is the top right of the engine. CIMG0045.jpg is bottom left. Thanks.
 

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I can't point out exactly which is your heater inlet hose. However, the picture that you have on the left is of a vacuum hose. That's where I disconnect mine to install a funnel when I'm performing the Seafoam process.

Edit: I just checked my Haynes manual. It was pretty vague as to which was the inlet and outlet hoses. Granted, they both connect to the firewall to go through to the heater core. I'm just not sure exactly which one it is. Maybe, someone else who's installed the kit will chime in. :)
 

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Discussion Starter · #3 ·
Thanks for the reply. Picture 1 is a diagram I found on Google. It looks nearly identical to mine, but mine goes into a tee (Picture 2). Wondering if that's it or not.
 

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That T in your pic looks less like a coolant line and more like a vacuum line, but it's hard to tell what I'm looking at from the crop of the photo. Coolant lines will always have a hose clamp on them, the type you need a screw/nut driver to tighten or loosen. Coolant systems are subject to high pressures so tension clips are seldom ever used, push on fittings never.

On those 3.0's there's a line that comes off the engine near around where the t-stat is (where upper radiator hose goes into the engine block) that loops around the back of the engine and goes into the heater core.

Remove the entire air cleaner plastic hose assembly from the throttle body then trace the line, or lines as there may be a bypass line. The lines may, or may not, go to metal at some point, then back to rubber to make the bend into the firewall. The hose that loops around from the block near the thermostat, with hose clamps on it, that goes into your firewall is the inlet, and will usually be the one on the drivers side if it's a side by side*. The outlet/return line will come out about 6" to the left of it (side by side) and go around the engine, to the passenger side, and will go back behind where your belts are to the water pump. If there is a bypass line there will be a Y joining those two lines together before the water pump.

Be aware that the cap on those T's with the flushing kits may end up leaking in the future, they may also hold fine, but YMMV. It's best to cut the old line and put in the T to flush with, then buy a new line to replace the cut one with. Hold on to the line with the T in it b/c you can always use it later to flush with again.

Also, if the engine/radiator is really dirty there's always the chance you may screw up the thermostat by getting flush debris lodged in it.

*If's it's an over/under heater core, then I don't have a clue, and you'll be best served by tracing.
 

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The heater inlet hose will originate from just before the t-stat. Usually there is a pipe of some sort leading to the t-stat housing.
 

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Discussion Starter · #8 ·
Thanks for the replies. They helped. I found the thermostat housing using the Ford Taurus Repair Manual and I see a hose connecting to it from one of images I provided before. I added another image showing where it comes from. So I'm guessing it's not a vacuum hose after all. Please let me know what you think. Thanks.
 

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Discussion Starter · #9 ·
Well, I went ahead and put the T on the hose. And it worked like a charm. Thanks for all your help!
 
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