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Old 04-05-2012, 06:59 PM   #1
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Thermostat Housing/water neck?

Replacing the water outlet on my sister's '94 GT.

The old (rusted) one on the left has the hole on the top blocked off. The new one does not. Is it supposed to be? What do I do?
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Old 04-05-2012, 07:11 PM   #2
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Re: Thermostat Housing/water neck?

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Originally Posted by NeedSomeMods View Post
Replacing the water outlet on my sister's '94 GT.

The old (rusted) one on the left has the hole on the top blocked off. The new one does not. Is it supposed to be? What do I do?
Just plug the hole with a pipe plug.
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Old 04-05-2012, 07:35 PM   #3
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Quote:
Originally Posted by Trojan Horse

Just plug the hole with a pipe plug.
+ 1. or hook up a nice aftermarket water gauge sensor to it.
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Old 04-06-2012, 03:33 PM   #4
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Quote:
Originally Posted by dreamstang

+ 1. or hook up a nice aftermarket water gauge sensor to it.
A water gauge is not in my budget. Haha
Where would I get a pipe plug, and what dimensions?
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Old 04-06-2012, 03:35 PM   #5
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Any local hardware store.lowest,menards,etc. I would get brass so it doesn't rust.

---------- Post added at 03:35 PM ---------- Previous post was at 03:34 PM ----------

I THINK mine is 3/8 but I can't he certain yours is the same.
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Old 04-06-2012, 03:52 PM   #6
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This?
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Old 04-06-2012, 04:11 PM   #7
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Just picked that up. Headed home to check fitment.
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Old 04-06-2012, 04:13 PM   #8
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You probably need npt threads.u have flare.
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Old 04-06-2012, 04:48 PM   #9
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Re: Thermostat Housing/water neck?

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You probably need npt threads.u have flare.
+1 You need a MIP plug with NPT threads.


MIP = Male Iron Pipe
NPT = National Pipe Thread
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Old 04-06-2012, 05:36 PM   #10
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I got it on there, tightened it down and everything. Will this not work?
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Old 04-06-2012, 05:47 PM   #11
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Re: Thermostat Housing/water neck?

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I got it on there, tightened it down and everything. Will this not work?
No, the threads are different and will not mesh well enough to seal.
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Old 04-22-2012, 05:22 PM   #12
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Okay, found the "MIP" plug, but nowhere on it does it say "NPT"
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Old 04-22-2012, 05:28 PM   #13
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that should work. the plug looks right.
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Old 04-22-2012, 05:36 PM   #14
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Quote:
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that should work. the plug looks right.
I thought so. But I thought the other one looked right too.. Thanks.
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Old 04-22-2012, 05:44 PM   #15
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i would use some kind of thread sealer on there.

---------- Post added at 05:44 PM ---------- Previous post was at 05:41 PM ----------

the threads on the other one werent tapered. a flare plug seals by the way the end is shaped, it will seat into the female side. the mip plug will have tapered threads on it as does your housing.
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Old 04-22-2012, 09:48 PM   #16
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Re: Thermostat Housing/water neck?

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Okay, found the "MIP" plug, but nowhere on it does it say "NPT"
That's it I believe, as long as the threads are tapered.


MIP = Male Iron Pipe
NPT = National Pipe Tapered (Threads)
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Old 04-22-2012, 10:12 PM   #17
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Well, we (my friend and I) got the everything installed, hooked up, and ran the car for a good while. Then I look at the temp gauge and it almost to red!!
Shut the car off, checked all connections, and he says "wait, which way is thermostat supposed to face?"................

Time to redo it all.
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Old 04-22-2012, 10:16 PM   #18
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Re: Thermostat Housing/water neck?

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Well, we (my friend and I) got the everything installed, hooked up, and ran the car for a good while. Then I look at the temp gauge and it almost to red!!
Shut the car off, checked all connections, and he says "wait, which way is thermostat supposed to face?"................

Time to redo it all.
Yep, the sensor end has to go into the engine water jacket and make sure the air is worked out of the system.
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Old 04-22-2012, 10:36 PM   #19
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What's the best way to work the air out? I was told to run the car with the radiator cap off and as it bubbles up add more fluid.

---------- Post added at 10:36 PM ---------- Previous post was at 10:29 PM ----------

I doubt this is the most efficient way.
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Old 04-22-2012, 10:39 PM   #20
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Re: Thermostat Housing/water neck?

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What's the best way to work the air out? I was told to run the car with the radiator cap off and as it bubbles up add more fluid.

---------- Post added at 10:36 PM ---------- Previous post was at 10:29 PM ----------

I doubt this is the most efficient way.
That will work or it will work itself out in the overflow tank.
The best is to find the highest point above the radiator cap if there is one and bleed the air off at that point.
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