1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

What is the cap called on water neck

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Old 10-09-04, 06:42 PM
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What is the cap called on water neck

Where your upper radiator hose goes, right next to that is a screw in cap of some sort. What is this called. I lost mine. Its above where the thermostat goes, mine was a black cap. I NEED THIS...also,the over flow tank is connected to it. Is this a Sealed type of a cap or a pressure type of cap? Any help, still got issues with cooling but I figured out I have a VW jetta type radiator.
Old 10-09-04, 07:09 PM
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What year is your engine???????

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Old 10-09-04, 07:11 PM
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its called the rad. cap mount
Old 10-09-04, 07:17 PM
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if its the one I am thinking of its on the 86-88 motors.
Old 10-09-04, 07:44 PM
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its a 12a im not sure what year i guess its picture time! where can I get a rad cap mount as I have lost mine. Does anyone know if this is a sealed or pressurized cap?
Old 10-09-04, 10:43 PM
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send us photos!!!!!!!!!!!!!!!!!!!

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Old 10-09-04, 11:44 PM
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Got the digital camera tonight and will have pictures tomorrow.
Old 10-10-04, 04:23 PM
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Heres a few pictures, my index finger is on the location of the cap I need, theres also the front radiator set up

These are so small, Ill try something else in a bit....
Attached Images    

Last edited by MountainDew67; 10-10-04 at 04:26 PM.
Old 10-10-04, 05:01 PM
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well, you can double click the pictures but there not showing full size unfortunatly. My last set of pictures on my last topic showed the pictures when you double clicked. ....
Attached Thumbnails What is the cap called on water neck-rotaryrad.jpg   What is the cap called on water neck-rotary2.jpg   What is the cap called on water neck-rotarybug2.jpg  

Last edited by MountainDew67; 10-10-04 at 05:13 PM.
Old 10-10-04, 08:51 PM
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Well, I went to the 2nd gen forum and there is a topic on first page of peoples engine bays, and yes 2 out of 3 of the cars in there had my waterneck, so I guess atleast I know its from a mazda, and can probably get it at a mazda yard. I dont know what was wrong with my measuring before, but today I measured and the water neck is 26" from ground and the radiator is 23"s, so I have my high point of cooling system located, so an air bleed is not needed. Now I just have to figure out if my jetta radiator...the cap...is a sealed cap or pressurized.
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