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4.0 thermostat housing.

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Old 01-07-2012, 03:55 PM   #1
pascal
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Default 4.0 thermostat housing.

I just noticed that I have a slow coolant leak on the Stand and it looks like the thermostat housing seal/0-ring is the culprit.
But I also heard that the housing itself is prone to crack since it's an ingenious plastic piece.
I have the wife checking the temp gauge constantly since it's her car.
She knows to shut it down if that needle moves, lol.

Anyway, do they make a metal/alloy one for those engines?
Since I have to yank it out to repair anyway, I figured I install a better quality one is it's available even if it's not cracked.
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Old 01-08-2012, 12:54 AM   #2
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If it's leaking, it's most likely cracked. The o-ring seal isn't going to leak unless the t-stat was replaced and the seal was damaged.
Fix it before she gets stranded!
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Old 01-08-2012, 10:15 AM   #3
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best thing you can do is just replace the housing, upper and lower, thermostat, sensor, and the 2 orings. i bought the parts from fords when i did mine, but rockauto.com has better prices for the parts. heres a write up i did with a bunch of pics from another forum. its a pretty easy job.
http://www.allfordmustangs.com/forum...tml?highlight=
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Old 01-08-2012, 12:45 PM   #4
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Quote:
Originally Posted by amustangrocks View Post
best thing you can do is just replace the housing, upper and lower, thermostat, sensor, and the 2 orings. i bought the parts from fords when i did mine, but rockauto.com has better prices for the parts. heres a write up i did with a bunch of pics from another forum. its a pretty easy job.
http://www.allfordmustangs.com/forum...tml?highlight=
Thanks budd.
Greatly appreciated.
The visual will help without a doubt.
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Old 01-09-2012, 06:08 PM   #5
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Quote:
Originally Posted by pascal View Post
Thanks budd.
Greatly appreciated.
The visual will help without a doubt.
no prob. its not really as hard to do as it might look, but i tried to show it all. you could get it done without pulling the tb, but i like to get everything out of the way, makes it real easy, and good time to clean the tb.
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Old 01-09-2012, 08:46 PM   #6
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I will tackle that job tomorrow.
Got the parts today...
It just pain me to use the same cheap plastic crap again.
I was hoping someone was making an aftermarket piece in alloy at least
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Old 01-10-2012, 04:20 PM   #7
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Here's a pic of the bad lower housing...

Click the image to open in full size.

It's actually a two piece glued together all around and guess where it leaked at?
At the joint of course!! Imagine that! Who da thunk dis?

Less than an hour job and the car's back in business.
I reuse the thermostat though... only because I have the feeling that this engine might not stay in the car long enough for IT (the thermo) to quit.
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Old 01-10-2012, 06:51 PM   #8
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Gees, Pascal. I never thought I'd hear you complain about the wife potentially getting "overheated".

(BTW, Nuked_06 and I got married on Saturday but don't tell anyone...)
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Old 01-10-2012, 08:06 PM   #9
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I just want to be there when she overheats.
...and I won't say a thing about your Nuptial dealings.
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Old 05-29-2013, 10:23 PM   #11
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I heard there is a metal thermostat housing that will be available soon, has anyone purchased one yet? I would like to buy one if anyone finds out where you can get one.
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Old 05-30-2013, 11:24 AM   #12
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I purchased a new thermostat housing last month, but it was plastic. I did not have a choice to purchase a metal one. I am curious of the cost......
If you find out, be sure to post info.
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Old 06-02-2013, 11:22 AM   #13
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4Season makes one (plastic also) for less than $35.
Part#: 85139, and it also cross reference with the 4.0 Explorers from 01 to 2010.
I just don't know how good that brand is.

Dorman Products makes a housing for the 4.0 Explorer the same years and I wonder if it would fit the Stang as well for less than $50...
Dorman is a much better quality than the OEM crap, despite the fact that it's still made out of plastic.
Part# is: 902-860

There is no metal housing on the horizon for these engines.
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Old 06-03-2013, 10:23 AM   #14
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Glad I found this post because I recently realized I had this problem, actually the dealer noticed...they wanted $400 to fix LOL .

Eddie, where are you? Wanna help a brother out?
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Old 06-25-2013, 10:26 PM   #15
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You should have replaced the thermostat, that is probably why it cracked. Mine did. I wouldn't give ford any money for parts they didn't make correctly. I bought perma-seal thermostat sealer and clamped it back together with longer bolts and a few extra clamps made from nails bend into a "C" shape. It wasn't until the gasket sealer blew out that Ford is using thermostats that destroy parts by overheating the car again. In the 90's if the thermostat went bad the car just wouldn't warm up, now they overheat and break parts. It has been 2 years since I fixed the housing.
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Old 09-25-2013, 11:21 PM   #16
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Just found a metal one thats on ebay, made in north america and Im gonna buy one. I hate the plastic ones. I found it by searching for v6 mustang 4.0 metal thermostat housing. Letting anyone know who is interested.
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Old 09-25-2013, 11:26 PM   #17
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Just found a metal one thats on ebay, made in north america and purchased one. I hated the plastic one. I found it by searching for "v6 mustang 4.0 metal thermostat housing".Just letting anyone know who is interested.The main lower housing is a one piece cast design, looks to be a good casting. I installed it without any problems. Also comes with all the orings and even an extra gasket that goes between under the upper neck. I like it and it will not rupture like my plastic one did and cause me to have two blown head gaskets and also 2 warped heads. My wife was driving and she said the temperature did not go into the red before she stopped and pulled over. Anyway this should fix my problem forever.
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Old 09-26-2013, 02:14 PM   #18
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Awesome ~ It's about time!
Do you know who manufactured it?
I found the one listed for $179.00
Is that how much you paid?
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- Airaid CAI
- Pypes Streetpro Exhaust
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- Billet Honeycomb Chrome Front Grille Overlay
- Smoked tail lights & turn signals, Mustang 3rd brake light decal
- Raxiom sequential tail light kit

Last edited by kevinmalec; 09-26-2013 at 02:18 PM.
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Old 09-26-2013, 04:18 PM   #19
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Quote:
Originally Posted by kevinmalec View Post
Awesome ~ It's about time!
Do you know who manufactured it?
I found the one listed for $179.00
Is that how much you paid?
Thats it Kevin, a bunch of the guys on the collective bought one.
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Old 09-27-2013, 11:30 AM   #20
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Thats it Kevin, a bunch of the guys on the collective bought one.
Nice! I have a feeling, in a few years I may need to upgrade, if I still have my Mustang. LOL
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- SCT Xcal3 w/ Brenspeed Custom Tunes
- Airaid CAI
- Pypes Streetpro Exhaust
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- SHR honeycomb decklid panel
- Cobra R wheels
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- Billet Honeycomb Chrome Front Grille Overlay
- Smoked tail lights & turn signals, Mustang 3rd brake light decal
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Old 09-27-2013, 11:30 AM
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03, 2007, 40, 40l, change, ford, hours, housing, labor, lower, metal, mustang, thermostat, thermostate, v6

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