Replacement of the thermostat?

Tiny
EMMANUEL INTSIFUL
  • MEMBER
  • 2006 TOYOTA 4RUNNER
  • 6 CYL
  • 4WD
  • MANUAL
  • 5,000 MILES
I am an auto student I want to know much about changing the thermostat.
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Monday, May 4th, 2009 AT 9:55 AM

21 Replies

Tiny
RASMATAZ
  • EXPERT
Its primary purpose is to control engine temperature. 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, May 4th, 2009 AT 10:03 AM
Tiny
EMMANUEL INTSIFUL
  • MEMBER
I have got your answer and is the best to my understading.
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Friday, May 8th, 2009 AT 5:54 AM
Tiny
JESTER
  • MEMBER
  • 2005 TOYOTA 4RUNNER
  • 105,000 MILES
We bought my son a 95 4-runner as a first car. It looked and ran like a very sound vehicle. 2 months after we bought the car (from a private party) it began to overheat. It progressively go worse. There was no leak or tell tale signs. My first thought was faulty thermostat. I purchased a new thermostat and when I removed the housing to remove the old thermostat, taaa-daaa! There was no thermostat in the vehicle. Is there a reason soemone would remove a thermostat and not replace it? I hope this is not a sign of things to come. Also, the water outlet (the coupling on the end of the hose that attaches and covers the thermostat) had a crack in it that had been sealed with gasket material. I now must replace that also.
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Thursday, January 7th, 2021 AT 4:04 PM (Merged)
Tiny
MHPAUTOS
  • EXPERT
There was obviously an over heating problem when the last owner had it, removing the thermostat is not a answer for this, it may be as simple as a part blocked radiator, get it out and core cleaned first, back flushing will not be enough it should have a full core clean done first, hopefully this is all that it needs, fit a new thermostat housing as well flush the cooling system and the heater, start here.
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Thursday, January 7th, 2021 AT 4:04 PM (Merged)
Tiny
CMNTGO100
  • MEMBER
  • 2000 TOYOTA 4RUNNER
I have a V6 limited with 120,000 miles that I just purchased from an individual. I put about 500 miles on it this weekend and noticed that every time I stop there is a puddle under the truck that I just figured was normal condensation. The problem is that it drips when the AC is off. I also noticed on the way back home today that there was a sheet of ice on the passenger side under the dash. I'm thinking that the thermostat is sticking or out? Can anyone give me some feedback on this? Thanks for any help.
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Thursday, January 7th, 2021 AT 4:05 PM (Merged)
Tiny
MHPAUTOS
  • EXPERT
Hi there,

If the thermostat was removed your engine temp would normally be well down and the heater not very hot. I would suspect a leaking heater core. You better have a pressure test done and keep an eye on the coolant level.

Mark (mhpautos)
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Thursday, January 7th, 2021 AT 4:05 PM (Merged)
Tiny
WALTER5550
  • MEMBER
I guess the ice and puddle of water is coming from the A/C when you drive it for long time at full cooling and in humid conditions.
The remedy is to frequently switch off the A/C for some minutes to avoid ice building.
Reason for the cool running might be wrong A/C gas or pressure setting in the A/C system.
It has nothing to do with the thermostat as this one controls the engine cooling, not the A/C. The A/C is driven by V-belt and compressor and not connected to the engine cooling system.

Good luck

Walter (Botswana and South Africa)
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Thursday, January 7th, 2021 AT 4:05 PM (Merged)
Tiny
IQBALJITSINGH
  • MEMBER
  • 1997 TOYOTA 4RUNNER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 145,000 MILES
I want to know where is thermostat and how to change it
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Thursday, January 7th, 2021 AT 4:05 PM (Merged)
Tiny
BLACKOP555
  • EXPERT
It is located at the end of the upper radiator hose, where the hose meets the engine is the thermostat housing, remove the bolts and you will see the thermostat.
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Thursday, January 7th, 2021 AT 4:05 PM (Merged)
Tiny
JSCOTTRICHARDSON
  • MEMBER
  • 1996 TOYOTA 4RUNNER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 166,000 MILES
Where is the thermostat located in this particular year
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Thursday, January 7th, 2021 AT 4:05 PM (Merged)
Tiny
BUDDYCRAIGG
  • EXPERT
Thermostats are almost always located where the lower radiator hose attaches to the engine.
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Thursday, January 7th, 2021 AT 4:05 PM (Merged)
Tiny
AMAROK
  • MEMBER
True, usually, but NOT in this case. It is located in the water pump housing off of the lower radiator hose in this engine.
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Thursday, January 7th, 2021 AT 4:05 PM (Merged)
Tiny
BUDDYCRAIGG
  • EXPERT
I stand corrected
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Thursday, January 7th, 2021 AT 4:05 PM (Merged)
Tiny
RMLAND09@COMCAST.NET
  • MEMBER
  • 1994 TOYOTA 4RUNNER
Engine Cooling problem
1994 Toyota 4Runner 6 cyl Four Wheel Drive Automatic

need to remove and replace thermostat
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Thursday, January 7th, 2021 AT 4:05 PM (Merged)
Tiny
BLUELIGHTNIN6
  • EXPERT
Drain the cooling system.
On 3F-E engines, disconnect the 2 vacuum hoses from the Bimetal Vacuum Switching Valve (BVSV), the cold start injector time switch wire and the water temperature switch connector.
Unbolt the housing, then remove the water inlet with the hose attached. If there is not enough room to pull both housing and hose out, you may want to disconnect the hose first. On 3F-E engines, remove the clamp bolt for the ISC water bypass pipe. Make certain to remove the gasket with the water inlet. Some of it will probably stick to the housing and require scraping.
Remove the thermostat.

To install:

When installing a new thermostat always use a new gasket. Be sure that the thermostat is positioned with the spring down or into the housing. On 3VZ-E engines, the jiggle valve (looks like a small rivet in the edge of the thermostat) must be at the top or 12 o'clock position.
Install the water inlet. Install the bolts finger-tight until the inlet is positioned exactly. Tighten the bolts to 10-14 ft. Lbs. (13-19 Nm). Overtightening will break the ear off the housing and spoil your afternoon-don't do it.
Install the hoses and wire connectors removed for access. Make certain the coolant hoses are not kinked or twisted after installation. Do not overtighten the hose clamps.
Fill the cooling system with coolant.
Start the engine and check for leaks. Top off any fluid levels.
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Thursday, January 7th, 2021 AT 4:05 PM (Merged)
Tiny
CABLMAN
  • MEMBER
  • 1994 TOYOTA 4RUNNER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 300,000 MILES
Water leaking from behind where thermostat goes
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Thursday, January 7th, 2021 AT 4:05 PM (Merged)
Tiny
MHPAUTOS
  • EXPERT
Hi there,

You may have a cracked thermostat housing, remove, clean & inspect, if in doubt replace as they are nor expensive, replace thermostat, flush coolant and replace the gasket, presser test when done to check for leaks.

Mark (mhpautos)
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Thursday, January 7th, 2021 AT 4:05 PM (Merged)
Tiny
MY4RUNNER
  • MEMBER
  • TOYOTA 4RUNNER
My truck is a 1988 Toyota 4Runner SR5 3.0L V6 214,000 miles and still running strong. About 2-3 weeks ago I broke down on the side of the road. I needed a tow to a garage. I was told I needed a new timing belt and was also told a radiator because mine had a crack at the top. I opted to have everything done. Also had the water pump replaced, and all hoses and belts replaced. Since I've had my truck back I've noticed the temperature gauge is floating a little higher then it usually is. Over the next few days I've noticed it coming up higher and higher. When I turn the car off, I noticed it shoots way up before it goes all the way down. I was told to replace the "fan clutch" and that would solve the problem. I did so. $200 & 1 day later, same problem. It's not going as high up, but I'm also not pushing it. It's a lot higher then it should be. I don't beleive it should be sitting more then 3/4th the way up on the gauge, and it's only in the mid to high 70's here in new jersey, my concern is what happens when 90 degree weather hits. Right now my truck is at the same mechanic and he said he is going to change the thermostat even though he did so 3 weeks ago. Any suggestions as to what it could be? Does this sound like the symptoms of a simple faulty thermostat? Thanx
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Thursday, January 7th, 2021 AT 4:05 PM (Merged)
Tiny
MIKE H R
  • EXPERT
Sounds like the thermastat is sticking, did the mechanic put the same temperture thermastat back in the vehicle? There are ones of diferent temp settings, example there is a 160 and 180 most comon, check to see if there the coolant level is correct.
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Thursday, January 7th, 2021 AT 4:05 PM (Merged)
Tiny
MY4RUNNER
  • MEMBER
Well after changing the fan clutch my temperature gauge was still fluxuating, it just didn't get as hot but was still hotter then it should be. After waiting all day for my mechanic to get around to looking at my truck, he changed the thermostat. When he removed the old one, we found a piece of crud or something stuck in it. I beleive this was causing the problem. Also 3 weeks ago he replaced it with a 192 thermostat when I originally had a 180. Threw the gauge way off. Well now that I have a 180 back in with no crud stuck in it, it's running great. No more fluxuation. Now if I can only figure out how to what the whurling noise is when I hit the gas I could make my truck a little quieter.
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Thursday, January 7th, 2021 AT 4:05 PM (Merged)

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