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  #1  
Old 09-15-2015, 10:08 AM
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Question about replacing Eng Coolant Temp Sensor

I'm about to replace the ECT, Eng Coolant Temp sensor due to a P0128 code. Figure I'll start with that before replacing the thermostat which is only 2yrs old.

Anyway, my question is do I need to drain any coolant before replacing this sensor? It seems pretty high up on the engine. Any tips for removal/replacement? I did some searches but couldn't find anything about doing this job.

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  #2  
Old 09-15-2015, 10:23 AM
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Re: Question about replacing Eng Coolant Temp Sensor

According to the service manual, the cooling system should be partially drained before replacing the sensor (and remember hot pressurized coolant is no fun!)

Take off the accessory belt, and unbolt the AC compressor (though leave it attached to all hoses, and support it out of the way). Take off the electrical connector on the sensor and then remove the sensor itself.

Installation is the reverse. Use thread sealant on the sensor, and torque to 8 ft. lbs.
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Old 09-15-2015, 12:06 PM
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Re: Question about replacing Eng Coolant Temp Sensor

Thanks for the quick reply. Dagnabit! I was hoping to avoid messing with coolant AND other accessories. So maybe it's not a simple task after all.
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Old 09-15-2015, 08:07 PM
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Re: Question about replacing Eng Coolant Temp Sensor

I got the same code. While the coolant temp is normal. Do I need to replace the sensor?
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Old 09-15-2015, 09:09 PM
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Re: Question about replacing Eng Coolant Temp Sensor

First things first: the temp sensor is NOT down on the block near the A/C compressor. It's on the driver side, just below the throttle body! The manual is wrong. I found this same statement about the manual on other forums about Hemi's. I did not drain any coolant since the sensor is up so high on the engine. I did loose about one cup of fluid once I removed the sensor. I just topped off the overflow with about 8oz to compensate.

Secondly, it's a PIA to remove. A std 19mm socket is too shallow and a deep socket was too long. Luckily I had a cheapo deep socket set that was halfway between std and traditional deep length although it was still too long to attach the ratchet. Reason being the driver side head is in the way of the socket end. I had to cut a piece of 3/8" bar about 1" long, insert into the socket and use a 3/8" open end wrench to unscrew the damn sensor What a cluster, but it worked!

I cleared the codes, drove around for 15mins to get to full engine temp and everything seems ok for now. Will have to see how it does over the next couple of days.
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Old 09-15-2015, 09:12 PM
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Re: Question about replacing Eng Coolant Temp Sensor

Quote:
Originally Posted by WK2ghazal View Post
I got the same code. While the coolant temp is normal. Do I need to replace the sensor?
My temp gauge was reading normal too. Then I got this code yesterday. I figured for $18, it was the cheapest option to start with, so why not? Next step would be a new thermostat.
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Old 09-16-2015, 09:34 AM
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Re: Question about replacing Eng Coolant Temp Sensor

Quote:
Originally Posted by SteelBlueWK View Post
First things first: the temp sensor is NOT down on the block near the A/C compressor. It's on the driver side, just below the throttle body! The manual is wrong. I found this same statement about the manual on other forums about Hemi's. I did not drain any coolant since the sensor is up so high on the engine. I did loose about one cup of fluid once I removed the sensor. I just topped off the overflow with about 8oz to compensate.

Secondly, it's a PIA to remove. A std 19mm socket is too shallow and a deep socket was too long. Luckily I had a cheapo deep socket set that was halfway between std and traditional deep length although it was still too long to attach the ratchet. Reason being the driver side head is in the way of the socket end. I had to cut a piece of 3/8" bar about 1" long, insert into the socket and use a 3/8" open end wrench to unscrew the damn sensor What a cluster, but it worked!

I cleared the codes, drove around for 15mins to get to full engine temp and everything seems ok for now. Will have to see how it does over the next couple of days.
Really? That's good to know. I've never replaced it, but at least now if I have to I won't be looking in the wrong spot!
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Old 09-17-2015, 10:21 AM
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Re: Question about replacing Eng Coolant Temp Sensor

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Originally Posted by SteelBlueWK View Post
My temp gauge was reading normal too. Then I got this code yesterday. I figured for $18, it was the cheapest option to start with, so why not? Next step would be a new thermostat.

How can I recognize it in my V6 engine? Is it in the same area of the Himi? Do you have a picture? Thanks.
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Old 09-17-2015, 09:32 PM
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Re: Question about replacing Eng Coolant Temp Sensor

Quote:
Originally Posted by WK2ghazal View Post
How can I recognize it in my V6 engine? Is it in the same area of the Himi? Do you have a picture? Thanks.
On the V6 it's at the front of the engine, down in between the A/C compressor and alternator. Here is where I could see having to unbolt the compressor and move it aside like dr.lee.baugh initially suggested. You can see the sensor in this link, scroll down to #21 and look at the bottom left pic (center-front of block just above the coolant passage opening).

2002 Jeep Liberty Engine Failure: 31 Complaints
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Old 10-10-2015, 03:00 PM
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Re: Question about replacing Eng Coolant Temp Sensor

FYI- replacing the ECT didn't fix my problem. Got the P0128 code again about a week later. Cleared it and waited. Got it again a few days later. So I just replaced my JET 180deg thermostat with a Motorad 180deg today. Will have to see if that clears up the issue.
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