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temp gauge

2K views 25 replies 5 participants last post by  Tyler980 
#1 ·
My 88 yj temp gauge used to work... now it doesn't. Any ideas what I could do to get it back?
 
#2 ·
Check the connection at the coolant temp sensor. If that is ok, replace the sensor and/or trace the wiring back as far as possible and look for breaks. It should be a single wire.
 
#6 ·
With the wire disconnected from the sensor it should be max hot. Disconnect the wire and ground it to the block and it should go max cold. If it does those then the sensor is bad. If it doesn't then the wire or guage is bad.
 
#11 ·
Backwards.

Pull wire off = full cold

Ground wire = full hot

The temp sensor is a "TURD" sensor.

Temperature Up Resistance Down

Max :cheers2:
 
#13 ·
Then I'd say you have an interruption in the wire or a bad gauge. Happy hunting :cheers2:

Maybe you can try to pull the gauge and see of there is any corrosion on it.
 
#15 ·
There are a few upper and lower screws on the panel that covers the gauge. After that just a few more screws and it should come out.
 
#21 ·
#23 ·
You need to use a meter and check the resistance from the connector on the cluster to the connector on the sensor. The other thing to test the guage is to short the pin on the cluster connector wire by putting a needle through the wire and short the wire to ground. I think you should do the resistance check.
 
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