Thermostat replacement instructions please?

Tiny
BOBCAT9095
  • MEMBER
  • 2004 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 49,000 MILES
The temperature gauge skyrockets into the red only at high speeds (65-70 mph) and with the heater on.
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Monday, January 21st, 2008 AT 12:52 PM

15 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good evening,

I attached the procedure for you of the replacement below. Here is a guide to help you step by step with instructions in the diagrams below to show you how on your car:

https://youtu.be/MKHnFY4WU8o

and

https://www.2carpros.com/articles/engine-overheating-or-running-hot

and

https://www.2carpros.com/articles/replace-thermostat

and

https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars

Check out the diagrams (below). Please let us know if you need anything else to get the problem fixed.
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Thursday, May 6th, 2021 AT 7:01 PM
Tiny
2CARPROS-ARCHIVES
  • MEMBER
  • 2003 FORD F-150
  • 165,000 MILES
Round rubber seal or gasket came with thermostat, does it go in housing on top of thermostat or behind thermostat at engine
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Monday, May 10th, 2021 AT 10:35 AM (Merged)
Tiny
DANNY L
  • EXPERT
Hello, I'm Danny
Here is a tutorial showing how to remove and replace a thermostat.

https://www.2carpros.com/articles/replace-thermostat

I've attached picture steps below for your Ford truck on how to remove and replace the thermostat including the placement of the gasket- O-ring. Hope this helps and thanks for using 2CarPros.
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Monday, May 10th, 2021 AT 10:35 AM (Merged)
Tiny
BULLDOG075
  • MEMBER
  • 2001 FORD F-150
  • 6 CYL
  • 2WD
  • MANUAL
  • 145,000 MILES
Where is the thermostat located on and how do I change the thermostat on my 01 F150 4.2L?
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Monday, May 10th, 2021 AT 10:35 AM (Merged)
Tiny
MERLIN2021
  • EXPERT
Follow upper radiator hose, goes right to it.
Let the engine cool off, then drain it down about a gallon, there is a draicok on the bottom of the radiator, then follow the upper radiator hose to the engine, there you will find the thermostat at the end of the hose, unbolt the two bolts. leave the hose attached to the housing. Scrape old gasket from both mating surfaces, install new thermostat, spring towards the engine. install the gasket, snug the housing bolts! Not to tight and bring the housing down evenly. refill the coolant and that's it!


https://www.2carpros.com/forum/automotive_pictures/62217_Tstat_1.jpg

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Monday, May 10th, 2021 AT 10:35 AM (Merged)
Tiny
EGANIER
  • MEMBER
  • 2001 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 100 MILES
How do I remove all the bolts from the coolant crossover tube from thermostat? It seems as though there are a couple of bolts on the underside that are not accessible. Is there a better way to remove bolts?

We are trying to replace the gasket on the passenger side. We have a ford f150 2001. In order to get to it the bolts have to be removed on both sides of the "Arm".

I will try to get the pic as soon as my husband comes back with it.
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Monday, May 10th, 2021 AT 10:35 AM (Merged)
Tiny
EGANIER
  • MEMBER
Here is the pic. The last bolt we cannot get to.
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Monday, May 10th, 2021 AT 10:36 AM (Merged)
Tiny
DOCFIXIT
  • EXPERT
What is in the way? Has fuel rail been removed?
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Monday, May 10th, 2021 AT 10:36 AM (Merged)
Tiny
EGANIER
  • MEMBER
Whatever the yellow plastic thing and what it is connected to, is blocking entry.
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Monday, May 10th, 2021 AT 10:36 AM (Merged)
Tiny
EGANIER
  • MEMBER
See whole pic as well.
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Monday, May 10th, 2021 AT 10:36 AM (Merged)
Tiny
EGANIER
  • MEMBER
Please see whole area as well.
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Monday, May 10th, 2021 AT 10:36 AM (Merged)
Tiny
DOCFIXIT
  • EXPERT
Have all bolts out three see diagram #8-#11-#7 yellow thing is injector as in have you removed fuel rail
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Monday, May 10th, 2021 AT 10:36 AM (Merged)
Tiny
MIKIE
  • MEMBER
  • FORD F-150
I replaced the stat in my '97 Ford F150 - 4.6L. The heater worked perfectly the next morning. It blew nothing but cold air that evening and always since. Other than possibly having the wrong stat or a defective one is there any other reason I would have this problem not withstanding a clogged heater core (which it's not). By the way I tried to donate to your cause but the link didn't work (some kind of error).
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Monday, May 10th, 2021 AT 10:36 AM (Merged)
Tiny
M_H_RITZEL
  • EXPERT
Try starting the engine when its cold. Holding the hose closest to the thermastat. The hose will stay cold until the thermastat opens. You should feel a sudden temperature change. Means the thermastat working properly. If the temp rises slowely than may be a stuck open thermastat. Have seen new ones that were bad. If the thermaste works ok then the heater core might be vapor locked or clogged.
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Monday, May 10th, 2021 AT 10:36 AM (Merged)
Tiny
DOCFIXIT
  • EXPERT
O.K. Called a friend that works for Ford said problem with 2001-2002 the plactic plenum cracks. Need to remove manifold says bolts from under and advised replacing manifold with new style
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Monday, May 10th, 2021 AT 10:36 AM (Merged)

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