Temp guage false reading - JeepForum.com

 
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post #1 of 7 Old 05-27-2006, 05:50 PM Thread Starter
mldcaptain
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Temp guage false reading

I'm goin nuts here, hopefully someone can shed some light on this for me. When I start my 98 GC, the temperature guage reads as far to the right as it can go even thought the vehicle has been off for hours. Also, my auto headlights turn on in the sunlight. What the hell!?

Anyone got any ideas?

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post #2 of 7 Old 05-27-2006, 07:37 PM
Test
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Probably the coolant sensor. As for the headlights, it's probably the sensor located on the top of the dashboard. What year and vehicle?
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post #3 of 7 Old 05-27-2006, 08:12 PM Thread Starter
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1998 grand cherokee laredo.
V8
5.2l I think
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post #4 of 7 Old 05-28-2006, 07:59 AM
greasefingers
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There are two coolant temp gauges. One on the thermostat housing for the ECU and another one for the dashboard gauge reading. Your gage sensor is either broke or more likely not plugged in. Check the electrical connector at the top of the gage. Also with the connector off measure the resistance across the gage. It should measure around 13,000 ohms at 70 F. When a gage pegs all the way to the right, the circuit has an Open. (meaning most of the times that a wire is broke or it is simply not plugged in)

Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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post #5 of 7 Old 05-28-2006, 10:45 AM Thread Starter
mldcaptain
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1-where is the gage sensor and what does it look like?
2-I'm assuming I have to take my dash apart to get to the gage and the gage sensor. Is this correct?
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post #6 of 7 Old 05-28-2006, 11:00 AM
greasefingers
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I do not believe the gage is the problem, but the sender unit/probe that will be mounted to the engine somewhere. I do not have your engine so I cannot say where exactly it is.

Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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post #7 of 7 Old 05-28-2006, 11:10 AM
greasefingers
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I do not know enough about the v8 engine. You might have one coolant temp sensor, that doubles as the sender for the dash board gage and the Input to the PCM/ECU? So I would start by examining the one sensor that I know of on the V*, which is located between the A/C compressor and the alternator. Make sure that the electrical connection is sound.

Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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