OE '93-97 Heater Return Pipe for 5.0L/5.8L w/o E4OD at Alternator
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This assembly (F3TH18C266DB) is NLA, but the hose is easy to replace with common 5/8" heater hose and a common hose clamp. The steel section has a smaller (1/4") nipple for the throttle heater return hose. If the throttle heater is already blocked off (as is common, due to rusted nipples or obstructions inside the TB), then the outlet nipple on the heater supply fitting on the intake can be capped, and this tube can be replaced with the more-common assembly (F3TH18C266CB) shown here:



If the throttle heater is still in-use when this tube fails, simply connect the throttle outlet (top nipple) to the radiator at the nipple below the overflow, as with E4OD.

Owner caption April 2022 · Photo 0 of 5000