Jon, Well I think you made a make a pretty convincing case that
that gizmo is indeed the "water control valve". You gathered the facts and
presented them in an orderly and simple manner such that even a numbskull like
me could only come to the correct conclusion. The only thing missing from your
argument was DNA evidence. I will take youralls word as gospel from now on.
So its as simple as splicing the water control valve in the new hose?
> carychip@hotmail.com wrote:
>
> > Thank you for the good explanation Rascal and Jon. A person could
> > get educated here. I had no idea axles had vents. I still think
> > that gizmo spliced into the heater hose must be a temp sensor that
> > goes to the instrument panel because it has a thin electical wire
> > that goes to the firewall. The wire seems too thin and wiry to be a
> > vacuum hose. The temp sensor near the water pump has 2 wires I
> > think and is connected to the computer. Where does the temp gauge
> > normally get its reading from? I figured the truck had 2 water temp
> > sensors, 1 for the computer and 1 for the guage. But heck, you
> > fellers know better than me. I'm just a guessin.
>
>
> You are correct on the temperature sensors. As of 1997, only one
> temperature sensor is used for both the gauge and the computer, but up
> through 1996, there is a two wire sensor used for the computer and a
> one wire sensor used for the gauge. You already found the 2 wire
> sensor for the computer, which should be located on the front, driver
> side of the intake manifold. If you look at the front, passenger side
> of the intake manifold, you'll find the one wire sensor for the gauge.
> (It is likely to be a purple wire with a yellow stripe.) On the
> pre-Magnum engines (which is what you have), the wire for this gauge
> sensor wire just snaps down on top of a threaded post on the temp sensor
> screwed into the intake manifold. (Unlike the 2-wire computer sensor
> which plugs into the sensor.)
>
>
> Regarding the gizmo, I guess you'll just have to trust us on this;
> its the water control valve. :-) Its got sort of a little cannister
> on it, and the "wire" comes out of that, right? It is indeed a very
> small line, about the same size as a 10-12 gauge electrical wire
> perhaps, but it is indeed a vacuum line. The cannister contains a
> diaphragm which shuts a valve in the water line when vacuum is
> applied. If you visit the following link, you'll see a diagram that I
> scanned for you from the factory service manual which shows the water
> control valve. Its from a 1990 manual, but it should be the same:
>
> http://tinyurl.com/ys7pxv
>
> Even beyond that, I'll give you another reason why it can't be a
> temperature sensor. :-) You have said that its only got one wire
> running from it towards the dash. If it were a temperature sensor it
> would need two wires - one for the signal and another for the ground.
> Although there are many temperature sensors which have only one wire,
> this is because they obtain their ground via the metal from the intake
> manifold or water pump which they are screwed into. In this case,
> since the gizmo is installed in the heater hose, it is electrically
> isolated from the rest of the vehicle, and would need a ground wire
> connected to it in order to function as a temp sensor.
>
> If you need further proof, go take a look your engine and find the
> sensor which I have stated above is for the water temperature gauge,
> and notice how it disconnects. Start the engine and run it up to
> temp, or so that the gauge is giving you some readings at least, then
> disconnect the wire and notice that the gauge no longer works. Be
> careful of the fan and belts if you disconnect it while the engine is
> running, it might be better to shut off the engine, disconnect the
> wire, then restart the engine (or just turn the ignition key to the on
> position so the gauges work.) By doing that, you can prove to
> yourself that it is the sensor in the intake manifold which is
> connected to the gauge, and thus the "gizmo" can't be the water temp
> sensor.
>
>
> --
> -Jon-
>
> .- Jon Steiger -- jon@dakota-truck.net or jon@jonsteiger.com -.
> | '96 Kolb Firefly, '96 Suzuki Intruder, Miscellaneous Mopars |
> `-------------------------------- http://www.jonsteiger.com --'
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