Temp guage does not work 1998 Jeep Grand Cherokee 5.9 LTD
All the other gauges in the cluster work fine, but the temp guage is not working; it just doesn't register anything. I asked a shop around here and they said that I'd have to have all the guages replaced in order to fix this issue and it would cost me over $500. Is this accurate?
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sounds like you have two totally separate problems...first, the temp problem sounds like the wiring that goes to the temp sensor is intermittant..the temp sensor is located on the thermostat housing and should have 2 wire plug on it..trace the wires to see if there are any breaks, worn spots, etc.... second, the problem with the vents is most likely caused by either the vacuum line that controls the vent door..or more commonly, the blend door itself...there is a kit available for upgrading the blend door that consists of replacing the old plastic door with a metal one...if you do a general search on the internet using the words "98 jeep grand cherokee blend door problem" it will giuve you several site in which they sell the parts and the insructions to install
I've had my 2005 Grand Cherokee into the dealer 5 times for the same issue and they've replaced a bunch of stuff, but have not found the problem yet. A quick fix, I've found, is to jiggle the key in the ignition. Doesn't fix the problem, but it does stop everything from going crazy! Let me know if anyone has the actual fix.
If you have verified that the dash temp gauge is correct by checking temp of coolant in radiator,yes your guess would be what i would change,the engine needs to have a 195degree thermostat in it.195 degrees is what the computer is programed to see as normal running temp.
On the rear of the instrument cluster there should be a resistor. This is how the fuel and temp guages are limited to a certain voltage decreasing the power to them so that they dont burn out. These (voltage limiters) resistors are available seperately from the dealership.
If you changed the coolant temperature sensor and it had a 5 volt ref signal to it then you replaced the wrong part. You need to replace the coolant temperature sending unit.
The coolant temp "sensor" is an input to the ECM for your fuel injection system.
The coolant temp "sending unit" is for coolant temp reading at the gauge, It is an NTC switch (negative temperature coefficient) which means as temp increases/resistance decreases.