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Question whats this?

On the back of the head theres a water line going to the hater core or something on the firewall. On that waterline, the part attached to the head, there is a sensor or something of some kind that looks like it should have 2 vacuum lines going ot it. What is that and if something hooks to it where does it comefrom/go?
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Old 08-17-2004, 03:42 AM
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Can you post a pic?
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Old 08-17-2004, 05:46 AM
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Which car?
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Hugh - So Cal 83 944 Driver Person
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Old 08-17-2004, 07:27 AM
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Its on the 86 na engine thats in the 83 now. There is some type of screw in sensor looking thing with 2 plastic nipples on it for vacuum lines but i dont ever remember taking anything off of them. Its located on the only line thats connected to the back of the head.
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Old 08-17-2004, 09:45 AM
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The 85.5's and newer had vacuum controlled heater core valves, correct? The older models didn't, they were manually controlled via a cable. I'm not sure though.
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Last edited by mattdavis11; 08-17-2004 at 11:52 AM..
Old 08-17-2004, 11:49 AM
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Think this is on the oil filler/breather?

If so it operates the valve for the charcoal cansiter. I think I have posted illustrations of these vacuum lines before. Should be the same for the early as well as the later 944 N/A's.

Do a search with SoCal and Vacuum.
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Old 08-17-2004, 11:53 AM
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this one
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Old 08-17-2004, 06:46 PM
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thats it...number 28, I have no idea what it is but i figured out what hooks up to it. Thanks a lot guys.
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Old 08-17-2004, 09:15 PM
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does it matter which vacuum line goes on which prod?
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Old 08-18-2004, 02:25 PM
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yes
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Old 08-18-2004, 07:25 PM
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lol....how do i figure out which one goes where?
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Old 08-18-2004, 09:52 PM
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could this have something to do with why my car wont start....which vaccum lines go on which nipple on number 28?
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Old 08-19-2004, 09:55 AM
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944 Freak, there should be a vacum hose diagram on the left (passeger) wheel well in the engine compartment (unless somone removed it) I will take a look tommorrow to see if I can figure out some guidance on which each leads to...
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Old 08-19-2004, 08:55 PM
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That sensor is a temperature operated vacuum switch which is designed to open when the coolant temperature reaches 58 degrees Celsius.

When the switch is open, vacuum is applied to the evaporative emissions cannister purge valves. This vacuum comes from the front most port on NA throttle bodies. The vacuum signal is very small, about 5" Hg or so, and is only applied just as the throttle plate comes open.

The system is designed to purge condensed fuel vapors collected by the charcoal cannister located in the driver side wheel well.

Having this disconnected should not prevent the engine from starting or running. However, if the port on the throttle body is not plugged you will have a vacuum leak.
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Old 08-20-2004, 05:08 AM
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