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Thermostat location for replacement?

Tiny
THEBABYFOX
  • MEMBER
  • 2003 HONDA ACCORD
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 157,000 MILES
I have a 2003 Honda Accord 3.0 V-6 sedan I recently purchased. I love it but recently when driving it the temp started to creep up I pull off the freeway and parked. I opened the hood and didn't see any leaking coolant, in addition I checked under the car, nothing. The car was still running at this time and I had turned off the A/C, at this time I turned it back on, and the car went back to normal temp. Ok I thought that the theromostat had gotten stuck so I continued on my way and nothing; then it happened again a few weeks later while waiting in the drive-thru line. I turned on the A/C and the temp went back to normal again. I'm thinking of replacing the thermostat but before I do I'm wondering if it could be something else.
Thank you.
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Monday, November 16th, 2009 AT 2:01 PM

35 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Here is a guide to help you step by step with instructions in the diagrams below to show you how on your car.

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

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Monday, November 16th, 2009 AT 5:27 PM
Tiny
THEBABYFOX
  • MEMBER
  • 2 POSTS
Tested the thermostat in a pot of boiling water (my Mom showed me how) and it opens so that seems alright. The coolant is boiling over therefore I'm having to add coolant whenever the vehicle overheats. Thing drives me nuts, I can drive over a 1000 miles in one day and nothing but the next day I can be sitting in drive-thru and it over heats. I have not replaced the Coolant Temp Sensor, but I'm not familar as to where it is.
Thank you!
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Thursday, May 27th, 2010 AT 11:31 AM
Tiny
STACY ZIMMERMAN
  • MEMBER
  • 26 POSTS
  • 2002 HONDA ACCORD
  • 1.3L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 240,000 MILES
I know where the thermostat goes an the gasket. My question is where it bolts to behind that is there a gasket that goes there? There is a small opening behind that mount an i'm thinking a gasket there?
You have the water neck then thermostat then gasket then that bolts to another part. Hope that helps explain.
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Thursday, July 1st, 2021 AT 9:32 AM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Take a look at this exploded view and tell me where you are seeing this other potential gasket.

I am just not sure exactly where you are seeing this. Thanks
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Thursday, July 1st, 2021 AT 9:32 AM (Merged)
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

The thermostat in your car is sealed with a rubber o-ring, not a gasket. Here is a tutorial for you to view on how to change:

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

I've also attached picture step instructions below for your car. Hope this helps and thanks for using 2CarPros.
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Thursday, July 1st, 2021 AT 9:32 AM (Merged)
Tiny
STACY ZIMMERMAN
  • MEMBER
  • 26 POSTS
It's not the o-ring seal it's the thermostat housing parr the back side where it bolts onto that. I need to know if there is a gasket. I will try an take a pic.
All those parts in the pic bolt onto another part that's the area i'm needing to know. I will try take a picture.
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Thursday, July 1st, 2021 AT 9:32 AM (Merged)
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

I've attached a picture from my prior post and circled an area in red. Is this what you are speaking of? Let me know. Hope this helps and thanks again for using 2CarPros.

Danny-
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Thursday, July 1st, 2021 AT 9:32 AM (Merged)
Tiny
STACY ZIMMERMAN
  • MEMBER
  • 26 POSTS
Does not look like mine, not sure. But yes behind that housing has a opening. I will get pic to make sure and show it.
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Thursday, July 1st, 2021 AT 9:32 AM (Merged)
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Okay, use your cell phone to take a picture and upload here. We will get back to you when we receive. Thanks again for using 2CarPros.

Danny-
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Thursday, July 1st, 2021 AT 9:32 AM (Merged)
Tiny
STACY ZIMMERMAN
  • MEMBER
  • 26 POSTS
No problem, thanks.
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Thursday, July 1st, 2021 AT 9:32 AM (Merged)
Tiny
STACY ZIMMERMAN
  • MEMBER
  • 26 POSTS
Okay, got picture. It bolts to the side of where EGR valve sits.
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Thursday, July 1st, 2021 AT 9:32 AM (Merged)
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Okay, just to be on the same page I've attached your picture below. Where I've circled in red are you asking if there is a gasket or o-ring? Let us know and we'll get back to you. Thanks again for using 2CarPros.

Danny-
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Thursday, July 1st, 2021 AT 9:32 AM (Merged)
Tiny
STACY ZIMMERMAN
  • MEMBER
  • 26 POSTS
Yes, that's the spot.
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Thursday, July 1st, 2021 AT 9:32 AM (Merged)
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

It shows the thermostat housing as using an o-ring to seal. I've attached a picture below as to what it looks like. Hope this helps and thanks again for using 2CarPros.

Danny-
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Thursday, July 1st, 2021 AT 9:32 AM (Merged)
Tiny
STACY ZIMMERMAN
  • MEMBER
  • 26 POSTS
This one is used for the thermostat seal an not for the seal to the side of EGR valve?
Will check auto parts store an see if they have picture as well. Thanks
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Thursday, July 1st, 2021 AT 9:32 AM (Merged)
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

That is the o-ring that goes from the thermostat housing to the EGR. The o-ring for the actual thermostat is completely round. Let me know if you have any further questions on this issue. Hope this helps and thanks for using 2CarPros.

Danny-
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Thursday, July 1st, 2021 AT 9:32 AM (Merged)
Tiny
STACY ZIMMERMAN
  • MEMBER
  • 26 POSTS
What is the gasket if any to go between the EGR an the housing?
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Thursday, July 1st, 2021 AT 9:32 AM (Merged)
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Both the thermostat and thermostat housing both use o-ring type gaskets. The thermostat o-ring that bolts to the head-EGR assembly which you are asking about is Honda part number-91312-P0A-000. Hope this helps and thanks again for using 2CarPros.

Danny-
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Thursday, July 1st, 2021 AT 9:32 AM (Merged)
Tiny
STACY ZIMMERMAN
  • MEMBER
  • 26 POSTS
Okay, thanks. I will check with parts store an see what I can come up with.
Thank you
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Thursday, July 1st, 2021 AT 9:32 AM (Merged)
Tiny
STACY ZIMMERMAN
  • MEMBER
  • 26 POSTS
So I have two gaskets as a o-ring one dor thermostat and then one behind to bolt to EGR valve side?
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Thursday, July 1st, 2021 AT 9:32 AM (Merged)

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