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Thermostat Replacement

Tiny
74DRHANK
  • MEMBER
  • 1999 LINCOLN TOWN CAR
The thermostat housing is leaking coolant; I have already replaced the O-ring, but the housing is still leaking. The only leak seams to be where the housing comes together (no leaks around hoses or bolts, etc). Any help would be greatly appreciated!
Monday, November 10th, 2008 AT 3:46 PM

8 Replies

Tiny
DALE DUPUY
  • MEMBER
  • 2 POSTS
I just got a 1999 Lincoln Town car that had a leak so I replaced the seal and it still leaked. I cleaned the housing with a solvent and ran the motor until it got hot. Parked it and watched the housing and found that it was seeping out of a crack in the housing. These manifolds of plastic crack a lot. I put Bondo on the crack and it lasted 3, ooo miles. Then I put super glue which sealed it. Now a little leak which means a new manifold.
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Monday, January 4th, 2010 AT 4:08 PM
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,542 POSTS
  • 1998 LINCOLN TOWN CAR
  • 160,000 MILES
How difficult is it to change the thermostat on my 4.6 engine
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Tuesday, April 28th, 2020 AT 1:07 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Follow the upper hose to the intake manifold. remove the hose there. remove the 2 10 mm bolts and there it is

Here is a video of the job being done on the same engine but different car.

https://youtu.be/MKHnFY4WU8o

Roy
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Tuesday, April 28th, 2020 AT 1:07 PM (Merged)
Tiny
JOEXRAY10
  • MEMBER
  • 2 POSTS
  • 1998 LINCOLN TOWN CAR
  • V8
  • 2WD
  • AUTOMATIC
  • 72,650 MILES
First I would like to thank both Docfixit, and rasmataz for answering my previous post. I think I should have told you the problem not my diagnosis of it. There is a leak between the upper intake manifold and the water outlet
I figured it was the thermostat so I purchased a new thermostat and "O" ring put them in and it still leaked. I then took it apart put on some RTV silicone as directed and it still leaks though not as much. The thermostat came with a washer that fit around the thermostat housing but when that washer is in place I cannot put the thermostat into the housing. I don't know what else to do. I do not see any cracks. Thanks again for your help
joexray
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Tuesday, April 28th, 2020 AT 1:07 PM (Merged)
Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
The only thing I see is that there is a rubber gasket that fits over the edge all around the thermastat. It is made of rubber. This keeps the thermastat in the intake housing. Then the thermatat gasket goes onto the intake housing. Then the outlet that the rubber hose that goes to the radiator goes on. Make sure the area is cleaned really good so no silicone is left to cause the leak. You can use some new sealent when you put the housing back together. Don't overtighten the bolts. Snug them up enough and let the sealent dry a little. Then retighten them up. Also check the housing for any pitting or minor cracks. If you find it is really pitted then you can pick up a new one at a local auto parts store. I have not see a thermastat where a metal wahser went over the thermastat.
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Tuesday, April 28th, 2020 AT 1:07 PM (Merged)
Tiny
JOEXRAY10
  • MEMBER
  • 2 POSTS
  • 1998 LINCOLN TOWN CAR
Engine Cooling problem
1998 Lincoln Town Car V8 Two Wheel Drive Automatic

how do you replace a thermostat on a 98 lincoln town car
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Tuesday, April 28th, 2020 AT 1:08 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi joexray10, Welcome to 2carpros and TY for the donation

Service and Repair

REMOVAL

CAUTION: Do not mix standard (green) coolant with Extended Life Coolant (orange). If this contamination occurs the service change interval on Extended Life Coolant will be reduced from 6 years/150,000 miles to 3 years/30,000 miles.

Drain coolant below water thermostat.


https://www.2carpros.com/forum/automotive_pictures/12900_ts1_3.gif



Remove the screw and cover.


https://www.2carpros.com/forum/automotive_pictures/12900_ts2_2.gif



Remove the bolts from the water hose connection.


https://www.2carpros.com/forum/automotive_pictures/12900_ts3_1.gif



Position the water hose connection and the upper radiator hose out of the way.


https://www.2carpros.com/forum/automotive_pictures/12900_ts4_1.gif



Remove the water thermostat and the O-ring from the intake manifold.
INSTALLATION


https://www.2carpros.com/forum/automotive_pictures/12900_ts5_1.gif



Follow the removal procedure in reverse order.
Fill the cooling system.
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Tuesday, April 28th, 2020 AT 1:08 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
Drain some coolant then remove top radiator hose fron thermostat housing. Remove two housing bolts then housiong and thermostat.


https://www.2carpros.com/forum/automotive_pictures/198357_Graphic_639.jpg


Hope this helps
Thanks for donate
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Tuesday, April 28th, 2020 AT 1:08 PM (Merged)

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