Engine Water Temp Gauge 80% Dead - Defender Source
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  #1  
Old December 27th, 2014, 11:34 PM
RBBailey
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Engine Water Temp Gauge 80% Dead

Won't work about 80% of the time.

Will show temp, then drop to nothing, on and off.

Which probe at the front of the block is the right one to look at? There are three that look like temp gauge probes.

Might it be the gauge itself?

I checked wires for bad connections, but only got so far in the few minutes of light I had.

Any ideas on what and where to look?
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  #2  
Old December 27th, 2014, 11:46 PM
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Absolutely sounds like a bad ground. I would start there.
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  #3  
Old December 27th, 2014, 11:54 PM
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On the bulkhead someplace?
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  #4  
Old December 27th, 2014, 11:56 PM
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My NAS temp gauge was doing the exact same thing. Checked grounds, sender wire, etc. Problem still persisted. Swapped to VDO gauge & sender, problem went away...so presumably was either the gauge itself or sender unit.
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  #5  
Old December 28th, 2014, 12:05 AM
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If it is a '94 or '95, it looks like this.

If it is a '97, it looks like this.
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  #6  
Old December 28th, 2014, 02:20 AM
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It's a 1988 LHD 3.5 V8

I'll look tomorrow in the light, but there are several. And I think they are on the same wiring harness.

It is more like the '94 style.
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  #7  
Old December 28th, 2014, 05:00 AM
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Pull the wire off the sender and ground it directly to the block. If the needle doesn't move it's the gauge.
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  #8  
Old December 28th, 2014, 08:07 AM
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It's this one…. but I'd recommend installing a VDO gauge & sender. I wanted to keep the original gauge so I installed the sender above the original one in the intake manifold.
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  #9  
Old March 24th, 2015, 10:51 AM
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I had a little of the same issue...

Quote:
Originally Posted by RBBailey View Post
Won't work about 80% of the time.

Will show temp, then drop to nothing, on and off.

Which probe at the front of the block is the right one to look at? There are three that look like temp gauge probes.

Might it be the gauge itself?

I checked wires for bad connections, but only got so far in the few minutes of light I had.

Any ideas on what and where to look?
I pulled the wire and grounded it to the block and needle made a nice smooth move to peg. I put the wire wheel on my battery powered Dremel (best thing to own for the 90 imho) and cleaned off both the plug and the probe. Now my needle sits just left of center when truck is warmed up which is where I hear it's supposed to be....
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  #10  
Old March 25th, 2015, 08:55 PM
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Well. I confirmed that the gauge works when the wire is grounded to the block. I also cleaned the contacts. No go.

Not a big deal since the engine and all is for sale. Basically it just means I don't have a true excuse to buy my first VDO gauge when I do the Tdi swap.
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  #11  
Old March 25th, 2015, 08:57 PM
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You need a new sending unit.
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  #12  
Old March 26th, 2015, 12:20 PM
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Yeah. But I'm not even going to worry about it now. When I started the thread I didn't have the Tdi yet.
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