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Diagnosing a dead coolant gauge?

707 Views 2 Replies 3 Participants Last post by  95classiclwb
Hi all,

Owner of a 1995 LWB with the 4.2. This summer a buddy and I rebuilt the engine from the crank up. After sorting out a few ignition wiring issues, the car started right up and idles very strong now.

However, the coolant gauge is pegged to the cold side, even after ~20 minutes of running. IR thermometer says the inlet temp is around 210 degrees, so I would expect to see something on the gauge.

How do I go about diagnosing the problem? From what I can tell, there are three coolant temperature measuring points:
1) the two pronged connector just above the thermostat
2) the screw-in "coolant temperature sending gauge" that connects to a small barrel connection on the wiring harness
3) the fuel injector-connector looking clip that fits into the intake manifold (has the same connector type as the fuel injectors)

How does this system work, and what should I look at to find the problem?

1 - 1 of 3 Posts
1- aircon
2 to instrument. If you measure 210 your pistol would be broke and /or your Range would be running on vapour
Measure the resistance cold and at ~100°C when you put the end in near on boiling water.

3 air intake?

Enviado desde mi SM-A720F mediante Tapatalk
1 - 1 of 3 Posts
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