Thermostat?

Tiny
KSNVTAM
  • MEMBER
  • 1998 HONDA CIVIC
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 148,000 MILES
Where is the thermostat located?
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Sunday, April 19th, 2009 AT 10:56 AM

36 Replies

Tiny
EUGENE123
  • MECHANIC
  • 273 POSTS
Remove and installation
1. Note the radio security code and station presets.

2. Disconnect the negative battery cable.

3. Drain the engine coolant into a sealable container.

4. Remove the fasteners from the thermostat housing and remove the thermostat.

To install:

5. Install the thermostat using a new seal. If the thermostat has a small bleed hole, make sure the bleed hole is on the top.

6. Apply an anti-seize compound to the threads of the fasteners.

7. Reassemble in the reverse order of disassembly.

8. Set the heater to the full hot position.

9. Locate the coolant bleed valve near the thermostat housing and open the valve 1 / 2 a turn.

10. Top off the cooling system and overflow reservoir with a 50/50 mixture of a recommended antifreeze and water solution. and bleed the system to remove any air pockets as necessary. Simultaneously squeeze the upper and lower radiator hoses to help push any captured air pockets out of the system.

11. Inspect all coolant hoses and fittings to make sure they are properly installed and if previously opened, close the bleed valve.

12. Connect the negative battery cable.

13. Install the radiator cap loosely and start the engine. Allow the engine to run until the cooling fan has cycled two times, then turn the engine off and top off the cooling system as necessary.

14. Install the radiator cap and inspect for leaks.

15. Enter the radio security code.

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 what happens.
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Sunday, April 19th, 2009 AT 1:06 PM
Tiny
PMP
  • MEMBER
  • 177 POSTS
  • 1998 HONDA CIVIC
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 136,000 MILES
Hi, I did my thermstat today, cool. Ant flush, and radiator cap. The thermostat was a 170 in there and running fine now im at a 180 thermostat and runs fine. This guy next door said I should I got a 195. Will my car not run good? I drove it around and its fine and the temperature gauge is good too. I live in a hot climate too. Whats the difference of a 180 and 195? TY
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Friday, December 25th, 2020 AT 9:24 AM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Engine runs hotter. Helps emissions levels but more heat is harder on engine/cooling system parts. I would stick with what you got.
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Friday, December 25th, 2020 AT 9:24 AM (Merged)
Tiny
PMP
  • MEMBER
  • 177 POSTS
WELL ADVANCEAUTOPARTS SAID 180 IS OE.
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Friday, December 25th, 2020 AT 9:24 AM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
That's what I meant. You got 180 is fine.
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Friday, December 25th, 2020 AT 9:24 AM (Merged)
Tiny
ERWIN_MOJICA
  • MEMBER
  • 5 POSTS
  • 1997 HONDA CIVIC
  • 4 CYL
  • 2WD
  • MANUAL
  • 126,000 MILES
Hi. Do you recquire a thermostat in a 97 civic even in a tropical country? Where is it located? Removing it, do you need a sealant or a gasket maker?
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Friday, December 25th, 2020 AT 9:24 AM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Yes, they are neded to keep the engine at the optimum temp for power and emissions. It is located where the lower rad hose connects to the engine. When you purchase the new one, ask for the gasket as well to prevent any leaks
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Friday, December 25th, 2020 AT 9:24 AM (Merged)
Tiny
ERWIN_MOJICA
  • MEMBER
  • 5 POSTS
Thanks !
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Friday, December 25th, 2020 AT 9:24 AM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
My pleasure
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Friday, December 25th, 2020 AT 9:24 AM (Merged)
Tiny
CRPC10
  • MEMBER
  • 1 POST
  • 1997 HONDA CIVIC
  • 174,000 MILES
I was replacing the thermostat on my car. As I was tightening one of the screws. It broke and the other half stayed in the hole of the part where you set the thermostat. I was wondering if the housing can come off so I don't have to drill out the broken screw while its attached to the motor!
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Friday, December 25th, 2020 AT 9:24 AM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 33,689 POSTS
Not clear on what the problem is. If the head is broken off and the other bolt is removed, of course you can lift the housing off. If part of the remaining bolt is sticking up you may be able to turn it with a vice-grip pliers. You can also slide a nut over it and weld it to the bolt, then use a socket and ratchet to unscrew it. I can describe how to do that even if the bolt is broken off flush. You'll need an acetylene torch, a wire feed welder, and at least one nut, maybe more.

If the remaining part of the bolt has already turned a little indicating it's not rusted tight you may be able to drill in the center with a left-hand drill bit and walk it out with that.
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Friday, December 25th, 2020 AT 9:24 AM (Merged)
Tiny
MCTRLSYS
  • MEMBER
  • 2 POSTS
  • 1995 HONDA CIVIC
  • 180,000 MILES
I have a car that is intermittently overheating. I have replaced the thermostat, the bottom hose and the electric fan so far. It still has issues. So here is the meat of what has happened. I eventually took the thermostat completely out just replacing the seal to find out if that was the issue. No it still overheats. The radiator is a dual core performance radiator and I know that is ok. I checked flow on it and there is no issue there. The system bleeds into the overflow quite a bit but that is not unexpected as I do not trust the cap. Now I know that it cant be the pump because then it would overheat constantly. Besides that the pump is so simple I couldn't imagine it going out. I also thought that maybe the belt was slipping but that would make a great deal of noise which it is not doing. Are there any other issues that I may be missing? The engine seems to run fine otherwise.
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Friday, December 25th, 2020 AT 9:24 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
First, put the thermostat back in. It must be there or you will fry the motor.

You most likely have blown a head gasket from the overheating. Have a leak down test done to confirm

Roy
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Friday, December 25th, 2020 AT 9:24 AM (Merged)
Tiny
MCTRLSYS
  • MEMBER
  • 2 POSTS
That has to be explained. Letting the coolant flow without restriction will fry the motor? That makes absolutely no sense. While it really makes it more difficult to warm up the engine in cold weather I cannot see how that will either fry the engine or blow the head gasket.
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Friday, December 25th, 2020 AT 9:24 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You blew the head gasket from overheating.

As far as the thermostat, it is there for a reason. It must be there to control flow throughout the motor. You have uncontrolled flow with it out and boils the water in the block. Its all about the engineering. If it did not matter, then it would not be there

Roy
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Friday, December 25th, 2020 AT 9:24 AM (Merged)
Tiny
JFUZZ521
  • MEMBER
  • 3 POSTS
  • 1995 HONDA CIVIC
  • 4 CYL
  • 2WD
  • MANUAL
  • 206,000 MILES
After starting my car on a very cold morning, it started idling erratically while warming up. I started driving and noticed that I wasn't getting any heat at all from the blower. After about 5 miles the car started to overheat. I immediately pulled over and let the engine cool down. I've checked the oil for coolant mixture but it still looks fine. I can still drive the car for short distances (still idles erratically) without overheating. If I change the thermostat, will this fix the problem or is there something else I need to worry about?
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Friday, December 25th, 2020 AT 9:24 AM (Merged)
Tiny
F4I_GUY
  • MECHANIC
  • 3,302 POSTS
You need to test the thermostat first.

With the vehicle at operating temperature both rad hoses should be around the same temperature. If the lower one is significantly cooler than the top hose that will indicate that the thermostat is stuck closed when it should be open.
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Friday, December 25th, 2020 AT 9:24 AM (Merged)
Tiny
JFUZZ521
  • MEMBER
  • 3 POSTS
F41-guy,

Thanks for your response. The temps were significantly different. I changed the thermostat today and topped off the coolant level. After driving for a while the temp gauge fluctuates between the 2 and 3 o'clock position. Also, I still don't get any heat from the blower. Just cool to warm air in all positions and levels. Any thoughts?
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Friday, December 25th, 2020 AT 9:24 AM (Merged)
Tiny
F4I_GUY
  • MECHANIC
  • 3,302 POSTS
It sounds like you did not bleed the coolant system properly.

With the engine cool, remove the rad cap and top up the coolant. Leave the cap off and start the vehicle with the heat on full. Let the vehicle idle until the thermostat opens up (so until both hoses are the same temperature) and you get heat coming out of the vents. Once this happens, usually all the coolant is bled out of the system.

Keep in mind as the vehicle is running the coolant level will get lower and lower since the air pockets are escaping, keep on refilling the radiator to the top.
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Friday, December 25th, 2020 AT 9:24 AM (Merged)
Tiny
DANNY REITER
  • MEMBER
  • 2 POSTS
  • 1994 HONDA CIVIC
  • 4 CYL
  • FWD
  • MANUAL
I've got a 94 Honda Civic CX with a 1.5 engine. Car was running on the cool side so I replaced the thermostat. Now it is running hot and the hose from the thermostat housing is cool. Is the what could be causing this? I the thermostat stuck closed? It is installed properly.
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Friday, December 25th, 2020 AT 9:24 AM (Merged)

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