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#1891344 - 10/23/09 05:08 PM thermostat housing won't seal!!!!!!
mentalheaded Offline
n00b

Registered: 01/06/09
Posts: 44
Loc: Silver lake.....WA
I replaced my thermostat 180 and also got a new thermostat housing and o ring.i put it all back toghter and it leaking out between the manifold and housing have taken it apart numerous time and it won't seal any suggestions.Composite manifold and i don't think it cracked?????????
_________________________
2000 CVPI Former Seattle PD Supivisors 72000 Miles
J-Mod,Zip tube,R-1 rotors and performance friction pad's,Track-lok c kit clutches 3.73 gears,hole sawed air box,Instaled Henious control arm's 7/30/2010!

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#1891348 - 10/23/09 05:11 PM Re: thermostat housing won't seal!!!!!! [Re: mentalheaded]
Colt45 Offline
less is moreŠ
Poobah

Registered: 08/30/04
Posts: 6364
Loc: Moses Lake, Wa
Take a closer look. Are you sure it is not cracked?
_________________________
-Colton
STRENGTH THROUGH HARMONY
HARMONY THROUGH FRIENDSHIP
EQUESTRIA PREVAILS

2004 Ford Crown Vic LX, 72k "Tank"
2002 Ford Crown Vic PI, 159k "Highwayman" (Ex-Kootenai County, ID Unit #42)

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#1891438 - 10/23/09 07:48 PM Re: thermostat housing won't seal!!!!!! [Re: Colt45]
LTDteether Offline
Over the Hill

Registered: 07/19/02
Posts: 4450
Loc: Democratic Rep. of Southpaw
When I took my thermostat out, I could see that the support had receded further into the housing and would no longer support the thermostat flange to provide a seal. It was easy to see that it was cockeyed when I was looking for the problem. I would bet you have the same problem. Mine got worse when I took it off and tried to seal it again. At first, it sealed itself when it got warm.

There is no fix to this problem, that I was able to conjure up, except a new manifold. Leaks tend to develop around the bolts too. I am sorry I don't have better news.
_________________________
'99 GM GS HPP.
I may not be a rocket scientist, but I *am* a scientist.

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#1891488 - 10/23/09 08:55 PM Re: thermostat housing won't seal!!!!!! [Re: mentalheaded]
gord_bolton Offline
Over the Hill

Registered: 05/06/02
Posts: 4691
Loc: Saskatoon, Saskatchewan
Is the new thermostat housing the same as the old one?

You put the new O ring on top of the thermostat?

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#1891573 - 10/23/09 10:10 PM Re: thermostat housing won't seal!!!!!! [Re: mentalheaded]
larryo340 Offline
Grand Poobah

Registered: 11/10/08
Posts: 10532
Loc: Long Island
That happened to another members car that turned out to be a small crack in the thermostat area of the intake. Once the thermostat housing was tightened it would start to leak. It was hard to spot with the thermostat out, but it was the cause of the leak.
_________________________

MOD List for MGM
...Marquis sold frown

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#1891772 - 10/24/09 06:17 AM Re: thermostat housing won't seal!!!!!! [Re: larryo340]
98P73_IRAQ Offline
Over the Hill

Registered: 04/26/08
Posts: 2931
Loc: iraq-baghdad-hell's street
install a thicker O ring and make a gasket for the tstat hosing and put a very little RTV layer both sides if you found a crack.
_________________________
http://www.supermotors.net/users/vic1992LX



1992 crownvic LX P74 (ex US DOD unit) SOLD 2009
1998 crownvic P73 (came from canada) SOLD 2014
1990 oldsmobile cutlass cierra 3.1L FE3 WORK VEHICLE
2007 toyota yaris 1.3L wife vehicle
2011 ford edge limited 3.5L AWD flooded (lifetime project)


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#1891777 - 10/24/09 07:26 AM Re: thermostat housing won't seal!!!!!! [Re: 98P73_IRAQ]
Dentman Offline
Member

Registered: 07/03/09
Posts: 145
Loc: North East
This happened to a coworkers Vic , we used a fair amount of RTV sealent and it's now roughly 6 months latter and he's still rolling leak free. Without doubt he's on borrowed time though , but it him back up and running when money was tight.
_________________________

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#1893525 - 10/26/09 08:10 PM Re: thermostat housing won't seal!!!!!! [Re: Dentman]
LTDteether Offline
Over the Hill

Registered: 07/19/02
Posts: 4450
Loc: Democratic Rep. of Southpaw
A thicker oring will probably just push the t-stat support into the manifold even more.
_________________________
'99 GM GS HPP.
I may not be a rocket scientist, but I *am* a scientist.

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#1893740 - 10/27/09 12:55 AM Re: thermostat housing won't seal!!!!!! [Re: LTDteether]
mentalheaded Offline
n00b

Registered: 01/06/09
Posts: 44
Loc: Silver lake.....WA
I appreciate all the help money is tight no work around here!I was planing on a pi manifold swap now it will be sooner than later.
_________________________
2000 CVPI Former Seattle PD Supivisors 72000 Miles
J-Mod,Zip tube,R-1 rotors and performance friction pad's,Track-lok c kit clutches 3.73 gears,hole sawed air box,Instaled Henious control arm's 7/30/2010!

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#1893746 - 10/27/09 01:13 AM Re: thermostat housing won't seal!!!!!! [Re: mentalheaded]
Colt45 Offline
less is moreŠ
Poobah

Registered: 08/30/04
Posts: 6364
Loc: Moses Lake, Wa
I hear you there.
_________________________
-Colton
STRENGTH THROUGH HARMONY
HARMONY THROUGH FRIENDSHIP
EQUESTRIA PREVAILS

2004 Ford Crown Vic LX, 72k "Tank"
2002 Ford Crown Vic PI, 159k "Highwayman" (Ex-Kootenai County, ID Unit #42)

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#1896806 - 10/30/09 12:25 PM Re: thermostat housing won't seal!!!!!! [Re: Colt45]
chipdog4 Offline

Over the Hill

Registered: 02/04/03
Posts: 1605
Loc: SouthWest Indiana
I had that problem with mine and my younger brothers Grand Marqs.
The new o-ring was a smaller overall diameter, by a very small amount. Re-used the old o-ring with no problems.

Dad runs an auto parts store and has since found a different supplier to get those o-rings.
Changed the antifreeze in our van w/ 5.4 and the new o-ring sealed it good.
_________________________
99 Merc (mine) 2000 Merc (older bro) 2001 Merc (younger bro)

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#1896854 - 10/30/09 01:17 PM Re: thermostat housing won't seal!!!!!! [Re: chipdog4]
Brad_Johnson Offline
Over the Hill

Registered: 07/30/02
Posts: 1005
Loc: Lubbock, TX
Easy solution - use an OEM o-ring.

Brad
_________________________
2002 LX Sport (P74) in Silver Frost Metallic.
Mods: Edelbrock IAS shocks. Michelin MXV4 235/55/17. 700w Crossfire OFIS (Old Fart Irritation System). Airbox horn removed. Headlight relay kit. J-Mod, finally - Yay!
...and officially DOA as of 12/21/2009 due to an elderly driver who thought red lights were just an amusing suggestion.

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#1898551 - 11/01/09 11:33 PM Re: thermostat housing won't seal!!!!!! [Re: Brad_Johnson]
delzy Offline
Member

Registered: 05/16/06
Posts: 224
Loc: Billings, MT - The Last, Best ...
Watch for a miss when it leaks from there it gets down the number 5 or 6 plug and corrodes the spring connection at the end of the COP.
_________________________

My fleet at it's max.

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#1917967 - 11/23/09 04:06 PM Re: thermostat housing won't seal!!!!!! [Re: LTDteether]
P71_Vic Offline
Member

Registered: 04/08/09
Posts: 405
Loc: Burke County, North Carolina
 Originally Posted By: Colt45
Take a closer look. Are you sure it is not cracked?
Nice ride Colt

 Originally Posted By: LTDteether
When I took my thermostat out, I could see that the support had receded further into the housing and would no longer support the thermostat flange to provide a seal. It was easy to see that it was cockeyed when I was looking for the problem. I would bet you have the same problem. Mine got worse when I took it off and tried to seal it again. At first, it sealed itself when it got warm.

There is no fix to this problem, that I was able to conjure up, except a new manifold. Leaks tend to develop around the bolts too. I am sorry I don't have better news.


x3,..this is one of those times when I wished the goose neck (water inlet) had a flange around the entire surface so a man could use an O-ring AND a gasket if needed. But mine turned out to be a cracked intake.
A dozen people other than myself never saw the crack, but it was there, and very apparent when my crossover shot its wad.
_________________________


_________________________________________________________
Long View, NC P.D. Decommissioned in Dec. '08-Purchased in January, '09 with 71,200 miles,
3:55 gears, K&N, FlowMasters, Stainless tips, Dorman intake,
Paint, Tuck, Kenwood head unit, Front end tuner mesh, Accel Super Coils cool

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#1918126 - 11/23/09 07:43 PM Re: thermostat housing won't seal!!!!!! [Re: P71_Vic]
Chevyguy Offline
Poobah

Registered: 01/04/04
Posts: 8279
Loc: Winchester Mass
And this is why you DO NOT change the thermostat on a all Nylon intake unless it is massivley failing.
_________________________
2004 MarauderM79 104K miles Jmod!! Lidio 93 tune for the track BOC 91 octane street tune 14.85 @95.63
2004 Crown Vic LX 145K Silver Birch Light flint leather FMX1 04 P-71 PCM swap 70 mm TB Custom shorting wire harness. 28/ 21mm MM swaybars Monroe severe duty shocks. Marauder subwoofer and painted cap heated mirrors. GT-500 Wheels NEED DUAL EXHAUST


Project car 74 Chevy Laguna type S-3, # match 400 SBC

Previous rides
93 P-71 2001 P-73, 94 TC Exec, 96 TC Signature

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