Why does the throttle body on my '90 Ford LTD Crown Vic need coolant connections

295

Asked by froeschl Sep 29, 2022 at 08:24 AM about the 1989 Ford Crown Victoria Base

Question type: Maintenance & Repair

There are 2 cooling water connections &
hoses (1x in, 1x out) on the intake
manifold/throttle body of my 1990 Ford
LTD Crown Victoria (5.0 l V-8). I don't
understand the purpose of this feature!
Especially in winter time, when the engine
is rather cold in the bginning, it takes quite
a while until the coolant gets hot and can
accelerate the warm-up of the engine by
heating up the intake air. But once it has
reached its operating temperature,  pre-
warming is not required/desired any more.
Means: when heat is needed, it's not yet
available - and when heat is available, it's
not needed any more. So what happens
when coolant hoses will be disconnected?
Thanks a lot for clarification!

2 Answers

310,265

It’s main purpose was to prevent icing up in the throttle body and upper intake. Where I lived at one time this was a major problem especially in late fall when the early morning temperature was right at 34 degrees and high humidity.

157,625

Exactly, in the old days a phenomenon known as "carburetor icing" could occur in cool, damp weather. To combat this hot exhaust gasses were directed through the intake manifold, under the carburetor, to keep the throttle plates warm until the engine warmed up. Later on hot coolant flowed around the throttle body of fuel injected engines, like yours, to prevent the throttle plates from getting ice on them. This was used for many years. My 2000 Grand Prix has coolant passages going around the base of the throttle body as well. Hope that helps! Jim

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