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Temperature Gauge reading HOT!!! Computer reads normal!!! Help!

B

badasp2005

New member
Okay I'm new to the forum and searched through it but have not found anyone else with this same problem on here. I recently did an engine swap and the old engine was having the same problem. But its still doing it with the new engine. Everything is working fine so far expect the temperature gauge.

What happens is I start the car and will have my scanner hooked up to monitor the temp. The gauge itself will start to rise as the engine warms up only its reading 160 when the scanner shows the computer reading 60 or so. Any way when we are all warmed up the scanner shows normal temp at idle like 195 and the gauge is reading in the red. The system has been bled and there is no air in it at all. The fans and everything work when it hits 215. I figured maybe the sensor was bad got a new one and same thing. I changed the wiring harness that clips onto the sensor and no change. The only thing i can think of is it has to be grounding out in that little green wire somewhere between the sensor and the gauge. I had a buddy from scrap yard bring another gauge cluster over and does the same thing on it as well. I guess my only other option is to either trace that wire down and rip the harness apart or just rerun a brand new wire from the sensor to the gauge.

Anyone else with suggestions or help would be appreciative.
 


This is on a 99 and the engine was from a 98 if that matters at all from what i can find the computer and gauge is ran off the one sensor located under the thermostat
 
Sounds more like the temp gauge on the cluster failed to me if the scanner is reading it correctly, since the gauge and the scanner read from the same sensor...
 
return that sensor, get another one. those damn temp sensors are well know to be bad brand new in the box.


snow guy, that sensor has two parts, one side the pcm reads, the other side to the dash cluster reads.
 
Scottydoggs said:
return that sensor, get another one. those damn temp sensors are well know to be bad brand new in the box.


snow guy, that sensor has two parts, one side the pcm reads, the other side to the dash cluster reads.
Click to expand...

Awkward, I didnt know that. lol. Thats weird... you would think the cluster could just get the info from the pcm .
 


SnowTh1ef said:
Awkward, I didnt know that. lol. Thats weird... you would think the cluster could just get the info from the pcm .
Click to expand...

It's actually how a lot of cars are set up. On my Stealth there are actually two different sensors. One 1-wire sensor for the gauge, and one 2-wire sensor for the ECU.
 
okay got a new sensor today and did a little test i placed it in a can of hot water and plugged it in. The scanner read the same temp that the gauge read for once!!! Damn you Oreilly's this is the 3rd sensor from them! So tomorrow i will put it in the motor and see if we have the same luck@!!
 
sad to say, but everyone who changes the temp sensor, well it takes 3 times till they get one that works.

makes the old saying ring true, third times a charm lol
 
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