coolant temp guage no worky - North American Grand Cherokee Association

Matt Bourland · 01-14-2005, 06:54 PM

my coolant temp guage has never worked on my 93 ZJ. I changed the sending unit twice to no avail. Here is my question, I took the guage cluster apart and checked everthing. I am getting power to the guage and the ground is good, also i am recieving a signal from the sending unit but the guage still says cold all the time. I took the guage itsself out of the cluster and checked resistance their I have 75 ohms(? i think,if i read it correctly) of resistance at the capacitor. the oil preasure guage has the same cap and the resistance at that cap is 40 ohms(? again if I read id it correctly). To me that says that the guage itsself is bad. What do oyu all think....opinions please! Is this a common problem, if so are the guages expensive? The dealers around here are idiots so asking them is like asking the jeep! thanks for the help.

Also does anyone make a-pillar guage pods for Grands?

Mad Mike · 01-15-2005, 07:08 AM

www.egauges.com

Good Luck.

Mad Mike

bambam95zj · 01-15-2005, 12:19 PM

I had the same problem last year. Like yourself, I replaced the temp sending unit twice and also the cooling sender. You need to make sure you specify that you want the sending unit for the gauge not the idiot light, and also only buy this from the dealer... pepboys/autozone will sell you the idiot light one and tell you its for the gauge. That said, it still never worked for me. I went through the same checks that you did and was baffled. I think that it must be something burnt in the ECU. I replaced mine with an electric that was attached infront of the cluster. It was pretty easy to do and the wireing was simple. If you go this route keep the sending unit that you have in the block already, because the ones that come with the aftermarket gauges are to long (at least the autometer and faze ones).

quebec4x4 · 01-16-2005, 11:09 AM

someone have the mopar part number? I go to the dealer and he dont find the part ...so i find a number, but i think it's for the stupid light.

AMC_Racer · 01-16-2005, 04:21 PM

Stupid question, but how about the thermostat?
Does the engine warm up?
If you ground the wire at the sensor, does the gauge climb all the way to hot?

Matt Bourland · 01-16-2005, 06:31 PM

trust me it gets hot! i think im goig to go to the dealer tomorrow and try again to get some more info and ill post what i find

quebec4x4 · 01-16-2005, 08:59 PM

there a part of the answer here

http://www.crownautomotive.net/catal...mp_sensor.html

quebec4x4 · 01-22-2005, 10:59 AM

i found my problem ....too much teflon on the sensor !! and the connector was loose.
:smile:

Matt Bourland · 01-22-2005, 03:16 PM

i found out that the guage is bad....however i went to to the dealership and the temp and oil pres. gauge(they are together) is like 250.bucks!. I will be buying and electric gauge to go in my new a-pillar pod.

01-14-2005, 06:54 PM	#1
Matt Bourland Member Grand Rookie Join Date: Aug 2004 Location: Lubbock, Texas Posts: 74	coolant temp guage no worky my coolant temp guage has never worked on my 93 ZJ. I changed the sending unit twice to no avail. Here is my question, I took the guage cluster apart and checked everthing. I am getting power to the guage and the ground is good, also i am recieving a signal from the sending unit but the guage still says cold all the time. I took the guage itsself out of the cluster and checked resistance their I have 75 ohms(? i think,if i read it correctly) of resistance at the capacitor. the oil preasure guage has the same cap and the resistance at that cap is 40 ohms(? again if I read id it correctly). To me that says that the guage itsself is bad. What do oyu all think....opinions please! Is this a common problem, if so are the guages expensive? The dealers around here are idiots so asking them is like asking the jeep! thanks for the help. Also does anyone make a-pillar guage pods for Grands? __________________ when I think of something witty and clever I'll put that in here 93 4.0 zj limited F/R(temp) 32"bfg m/t http://img.photobucket.com/albums/v6...ask5/c55c2.jpg

01-16-2005, 11:09 AM	#4
quebec4x4 Senior Member Grand Junkie Join Date: Sep 2004 Location: Quebec, Canada Posts: 132	someone have the mopar part number? I go to the dealer and he dont find the part ...so i find a number, but i think it's for the stupid light. __________________ ZJ 1994 : 4.0L, AX-15, Atlas 4, 8", 36" Irok, D44R ARB D44 Spool, 4.88, 8274-XP Ram 2500 2wd, 5.9L ISB, NV4500, Egde/Attitude, Banks brake, Fass fuel pump Mog 411.117

01-16-2005, 06:31 PM	#6
Matt Bourland Member Grand Rookie Join Date: Aug 2004 Location: Lubbock, Texas Posts: 74	trust me it gets hot! i think im goig to go to the dealer tomorrow and try again to get some more info and ill post what i find __________________ when I think of something witty and clever I'll put that in here 93 4.0 zj limited F/R(temp) 32"bfg m/t http://img.photobucket.com/albums/v6...ask5/c55c2.jpg

01-16-2005, 08:59 PM	#7
quebec4x4 Senior Member Grand Junkie Join Date: Sep 2004 Location: Quebec, Canada Posts: 132	there a part of the answer here http://www.crownautomotive.net/catal...mp_sensor.html __________________ ZJ 1994 : 4.0L, AX-15, Atlas 4, 8", 36" Irok, D44R ARB D44 Spool, 4.88, 8274-XP Ram 2500 2wd, 5.9L ISB, NV4500, Egde/Attitude, Banks brake, Fass fuel pump Mog 411.117

01-22-2005, 10:59 AM	#8
quebec4x4 Senior Member Grand Junkie Join Date: Sep 2004 Location: Quebec, Canada Posts: 132	i found my problem ....too much teflon on the sensor !! and the connector was loose. :smile: __________________ ZJ 1994 : 4.0L, AX-15, Atlas 4, 8", 36" Irok, D44R ARB D44 Spool, 4.88, 8274-XP Ram 2500 2wd, 5.9L ISB, NV4500, Egde/Attitude, Banks brake, Fass fuel pump Mog 411.117

01-15-2005, 07:08 AM	#2
Mad Mike Member Grand Rookie Join Date: Jan 2004 Location: New York City Posts: 55	www.egauges.com Good Luck. Mad Mike

01-15-2005, 12:19 PM	#3
bambam95zj Member Grand Rookie Join Date: May 2004 Location: MD 2 Close 2 DC Posts: 60	I had the same problem last year. Like yourself, I replaced the temp sending unit twice and also the cooling sender. You need to make sure you specify that you want the sending unit for the gauge not the idiot light, and also only buy this from the dealer... pepboys/autozone will sell you the idiot light one and tell you its for the gauge. That said, it still never worked for me. I went through the same checks that you did and was baffled. I think that it must be something burnt in the ECU. I replaced mine with an electric that was attached infront of the cluster. It was pretty easy to do and the wireing was simple. If you go this route keep the sending unit that you have in the block already, because the ones that come with the aftermarket gauges are to long (at least the autometer and faze ones).

01-16-2005, 04:21 PM	#5
AMC_Racer Senior Member Grand Addict Join Date: Oct 2004 Posts: 628	Stupid question, but how about the thermostat? Does the engine warm up? If you ground the wire at the sensor, does the gauge climb all the way to hot?

01-22-2005, 03:16 PM	#9
Matt Bourland Member Grand Rookie Join Date: Aug 2004 Location: Lubbock, Texas Posts: 74	i found out that the guage is bad....however i went to to the dealership and the temp and oil pres. gauge(they are together) is like 250.bucks!. I will be buying and electric gauge to go in my new a-pillar pod. __________________ when I think of something witty and clever I'll put that in here 93 4.0 zj limited F/R(temp) 32"bfg m/t http://img.photobucket.com/albums/v6...ask5/c55c2.jpg

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