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Thermostat location and replacement?

Tiny
ILOVEYOU1962
  • MEMBER
  • 2001 ISUZU RODEO
  • V6
  • 2WD
  • AUTOMATIC
  • 17,000 MILES
We can't find the thermostat where we can replace it.
Friday, March 29th, 2019 AT 6:39 PM

20 Replies

Tiny
JOETECHPRO
  • MECHANIC
  • 705 POSTS
Hey ILOVEYOU1962,

On this engine it looks like the thermostat is in a housing connected to the lower radiator hose.

Follow the lower radiator hose and you should see a housing as in the picture attached to this message.

Hope that helps.

Regards, Joe
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Friday, March 29th, 2019 AT 7:09 PM
Tiny
HEMI06
  • MEMBER
  • 1 POST
  • 2001 ISUZU RODEO
  • 6 CYL
  • 4WD
  • 141,000 MILES
Where is the thermostat located at on the 2001 isuzu rodeo v6 engine
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Wednesday, October 7th, 2020 AT 12:51 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
There you go.
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Wednesday, October 7th, 2020 AT 12:51 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Removal

Disconnect battery ground cable.
Drain engine coolant from the radiator and engine.
Disconnect radiator hose from the inlet pipe.
Remove thermostat housing.
Remove thermostat (2).
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Wednesday, October 7th, 2020 AT 12:51 PM (Merged)
Tiny
BONNIE TAYLOR
  • MEMBER
  • 1 POST
  • 2001 ISUZU RODEO
  • 3.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
Please provide step by step instructions on how to replace the thermostat on the car listed above. I don't want just general instructions on any car. I want specific instructions for my car only! I am a girl and trying to do this by myself. Thank you!
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Wednesday, October 7th, 2020 AT 12:51 PM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi Bonnie,

Here is the service procedure from the manual for your vehicle. Unfortunately, manuals of this age tend to leave out some pretty big steps because they are intended only for technicians who know the steps prior to getting to the point of remove the actual thermostat.

The steps that are missing from this procedure are that you need to remove the intake manifold. Not a simple task. Here is a video that shows briefly what it looks like to do this:

https://youtu.be/bzGyVliYlig

I would not recommend anyone perform this if you are not familiar with this engine because it is not the easiest thing to do. Please let me know if you need more information. Thanks

FYI - each attachment is labeled. The fourth one just shows where the drain plug is on the radiator.
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Wednesday, October 7th, 2020 AT 12:51 PM (Merged)
Tiny
JACKJACK1
  • MEMBER
  • 2 POSTS
  • 2000 ISUZU RODEO
  • 160,000 MILES
Hello, I have a 2000 Isuzu Rodeo V6 3.2L Automatic, I am trying to replace the thermostat but I have to idea of where it could be, or and how to access it, I already tried to remove the radiator but I could get to the thermostat, it seems to be located under the intake but I am not sure, I hope that I wont have to remove manifold and disconnect gas pipes, thank you for your help.
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Wednesday, October 7th, 2020 AT 12:52 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,724 POSTS
Hello,

Here is a guide that will walk you through the steps

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

Install the thermostat into the outlet pipe (4) making sure that the air hole is in the up position. Install thermostat housing and tighten the bolts to 18 ft. lbs. (25 Nm).
Attach the radiator hose to the inlet pipe. Refill the engine with the proper type and amount of coolant. Connect the negative battery cable. Start engine and check for coolant leakage.

Check out the diagrams (Below)

Please let us know if you need anything else to get the problem fixed.

Cheers
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Wednesday, October 7th, 2020 AT 12:52 PM (Merged)
Tiny
JACKJACK1
  • MEMBER
  • 2 POSTS
Thank you for your fast answer, however I already know all the steps that needs to be taken to change a thermostat, the thing that I was asking is where is the thermostat located on an Izusu Rodeo 2000 V6 L3.2 and do I need to take my manifold apart?
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Wednesday, October 7th, 2020 AT 12:52 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
If you follow the lower radiator hose, you would come to the housing.
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Wednesday, October 7th, 2020 AT 12:52 PM (Merged)
Tiny
JESSICASHARP
  • MEMBER
  • 1 POST
  • 1999 ISUZU RODEO
  • 150,000 MILES
I need help in replacing the thermostat. It is in a difficult place and I just want to know the step-by-step instruction and a diagram would be very helpful too. It seems to be in the engine block and I think the top of the engine block might need to be removed to get to the thermostat.
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Wednesday, October 7th, 2020 AT 12:52 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Here is a guide to help walk you throught he steps with the instruction in the diagrams below to show you how on your car.

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

THERMOSTAT

Removal

Disconnect battery ground cable. Drain engine coolant from the radiator and engine. Remove throttle body. Disconnect radiator hose from the inlet pipe. Remove thermostat housing. Remove thermostat

Install thermostat into the outlet pipe making sure that the air hole is in the up position. Install thermostat housing and tighten bolts to 25 N.m (18 ft. lbs.). Installation rubber hose. Replenish engine coolant. Start engine and check for coolant leakage.

Check out the diagrams (Below). Please let us know what happens.
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Wednesday, October 7th, 2020 AT 12:52 PM (Merged)
Tiny
A666LEX
  • MEMBER
  • 1 POST
  • 1998 ISUZU RODEO
  • 6 CYL
  • 4WD
  • MANUAL
How do you replace the thermostat in a 1998 isuzu rodeo v 6 4 wheel drive 3.2 lit
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Wednesday, October 7th, 2020 AT 12:52 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hey A666LEX

You should start by draining he coolant. Here is a guide to let you know what you are in for step by step and diagrams below to show you what is like 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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Wednesday, October 7th, 2020 AT 12:52 PM (Merged)
Tiny
J.C.AYDELOTT
  • MEMBER
  • 1 POST
  • 1998 ISUZU RODEO
  • 3.6L
  • V6
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
Just bought this vehicle used in the summer to drive back a forth between west Texas and home. The winter set in and I decided to turn on the heater for the first time. Not warm at all. I got home and undertook the project of changing the thermostat. I get the intake off and to the thermostat. I removed the top part of the thermostat housing and see the thermostat was there, sorta! The top of the thermostat was there in the tube but from the ring down was gone. No arms and no spring. I thought nothing about it because I could see a lot of work was done to the motor (shotty at best) and I put the thermostat in and threw the old one away. I drove the vehicle after and it overheats. So I go home and take the thermostat out and look for the other half of the thermostat as best as I could just to find nothing. I put the motor back together, without the thermostat, just to see that the vehicle still overheats. I also checked the water pump, no leaks, no bad bearings. Could I have washed the thermostat into the motor?
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Wednesday, October 7th, 2020 AT 12:52 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

Sounds like someone put only part of the thermostat back during a repair and they had the same issue as you.

The thermostat has to be there for proper circulation of the cooling system. when you do not have a thermostat in the system, the coolant only circulates from the lower hose to the thermostat. the rest of the block and heads get no circulation.

https://www.2carpros.com/articles/how-an-engine-thermostat-works

the result is internal engine damage from lack of circulation.

the damage was done with the incomplete thermostat installed. someone did some shoddy job on whatever repair they attempted and now it is your issue to deal with.

I would have a leak down test on each cylinder to confirm head gasket damage.

https://www.2carpros.com/articles/head-gasket-blown-test

Roy

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Wednesday, October 7th, 2020 AT 12:52 PM (Merged)
Tiny
WENDYYYY
  • MEMBER
  • 1 POST
  • 1994 ISUZU RODEO
Engine Cooling problem
1994 Isuzu Rodeo Question 4 cyl Automatic

Where is the thermosat located on a 1994 Isuzu Rodeo (4cylinder, automatic) and is it difficult to get to it?
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Wednesday, October 7th, 2020 AT 12:52 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS


https://www.2carpros.com/forum/automotive_pictures/261618_0900c15280062454_1.jpg

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Wednesday, October 7th, 2020 AT 12:52 PM (Merged)
Tiny
THERMOHEAD
  • MEMBER
  • 1 POST
  • 1994 ISUZU RODEO
  • 2.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 180,000 MILES
What temperature thermostat do I need for replacement?
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Wednesday, October 7th, 2020 AT 12:53 PM (Merged)
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
A 180 degree thermostat is what it came with.

Bumping up to a 195 will make your heater throw out more heat, if you might be needing that.

The Medic
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Wednesday, October 7th, 2020 AT 12:53 PM (Merged)

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