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  #1  
Old June 9th, 2019, 21:56
randy57 randy57 is offline
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1990 Renix Coolant Temp Sensor Question

Has anyone recently replaced their coolant temperature sensor in their 1990 4.0? This one is the stock one and fits into the side of the block up by the left engine mount? If so was it like this one or did you have to modify an aftermarket one?

Thanks in advance.
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Old June 10th, 2019, 05:31
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tjmotter tjmotter is offline
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Re: 1990 Renix Coolant Temp Sensor Question

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Originally Posted by randy57 View Post
Has anyone recently replaced their coolant temperature sensor in their 1990 4.0? This one is the stock one and fits into the side of the block up by the left engine mount? If so was it like this one or did you have to modify an aftermarket one?

Thanks in advance.

hmm.. the coolant sensor on my '90XJ is located on the back of the head on the drivers side. Are you sure that isn't the knock sensor?
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Old June 10th, 2019, 05:55
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cruiser54 cruiser54 is offline
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Re: 1990 Renix Coolant Temp Sensor Question

Okay.

Temp SENDER for the gauge is at the driver's side back of head.
Temp SENSOR for the ECU is down low on driver's side block.
Temp SWITCH for turning the electric fan on is in the lower left hand side of the radiator.

Now, to the OP: Why are you wanting to replace that SENSOR?
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Old June 10th, 2019, 11:52
randy57 randy57 is offline
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Re: 1990 Renix Coolant Temp Sensor Question

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Originally Posted by cruiser54 View Post
Okay.

Temp SENDER for the gauge is at the driver's side back of head.
Temp SENSOR for the ECU is down low on driver's side block.
Temp SWITCH for turning the electric fan on is in the lower left hand side of the radiator.

Now, to the OP: Why are you wanting to replace that SENSOR?
I was referring to the sensor that is down low on driver's side block, like you had mentioned, just behind the motor mount bracket. It's 1/2 inch or so above the oil pan.

I thought it was a coolant temp sensor. I think it was moved to the thermostat on later years.

I wanted to upload a picture of it but the only option I see for that is via a webpage link
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Old June 10th, 2019, 12:05
randy57 randy57 is offline
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Re: 1990 Renix Coolant Temp Sensor Question

The sensor in question is the knock sensor. Thought it was the coolant sensor. My apologies to everyone.
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Old June 10th, 2019, 12:09
randy57 randy57 is offline
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Re: 1990 Renix Coolant Temp Sensor Question

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Originally Posted by tjmotter View Post
hmm.. the coolant sensor on my '90XJ is located on the back of the head on the drivers side. Are you sure that isn't the knock sensor?
Yes it is the knock sensor. My apologies for the confusion.
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Old June 10th, 2019, 13:58
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Re: 1990 Renix Coolant Temp Sensor Question

As soon as I saw "1/2" above the oil pan" I was suspicious. LOL. It has a connector identical to your fuel injectors.
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Old June 10th, 2019, 14:06
randy57 randy57 is offline
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Re: 1990 Renix Coolant Temp Sensor Question

It does.
I was freaking out because I did a ohms test on it and got nothing.
Called dealer for a part number I could reference. But all the coolant temp sensors I searched for and part number I got looked nothing like the knock sensor (which I thought was the coolant sensor)
I was thinking: here I go again, scrap the jeep because of a small part I cant find.
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Old June 10th, 2019, 14:16
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cruiser54 cruiser54 is offline
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Re: 1990 Renix Coolant Temp Sensor Question

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Originally Posted by randy57 View Post
It does.
I was freaking out because I did a ohms test on it and got nothing.
Called dealer for a part number I could reference. But all the coolant temp sensors I searched for and part number I got looked nothing like the knock sensor (which I thought was the coolant sensor)
I was thinking: here I go again, scrap the jeep because of a small part I cant find.
well, you dodged a bullet!!!!
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  #10  
Old June 11th, 2019, 07:32
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Saudade Saudade is offline
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Re: 1990 Renix Coolant Temp Sensor Question

The new sensors are different in that they are 2 piece. Basically a stud that screws into the block, and the sensor that sips over the stud.

The one on my '88 hasn't worked in years.
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  #11  
Old June 11th, 2019, 22:14
randy57 randy57 is offline
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Re: 1990 Renix Coolant Temp Sensor Question

Yea, that is the one that goes to your gage.
The other one in the side of the block goes to the ECU.
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