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Coolant warning light flashing but temp gauge indicates normal temperature. At first was intermittent but now starts flashing with each startup. Maybe a sensor? Simple replacement?

On Fri, Feb 17, 2023 at 08:28 PM, rhodney wrote:

Coolant warning light flashing but temp gauge indicates normal temperature.

I've only ever seen that when the coolant level was low.? In at least one case it was the sensor in the reservoir and the tank had to be replaced.
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Duane
05HD Rialta
220K Miles

I have the same problem in my 96. It started intermittent and now starts as soon as it’s turned on. We replaced a lot of sensors but it continues.?

We didn’t replace the sensor in the reservoir and replace it as Duane just mentioned but we did the rest.?

Mine isn’t leaking. I always check it because of this light going off.?

So it seems my issue is my reservoir or sensor there. Wish I would’ve know this before I changed a bunch of temperature sensors.?

Glad to learn this.?

I did this test this morning and the sensor in the overflow orb is what is causing me problems (makes sense since I replaced the other sensors).

In order to fix this I have to replace the entire overflow orb correct? I can't just replace the sensor in there -- its built into the orb?
I'd love to only see that light flash when there was an actual problem.

Thanks
DTW

So you're saying the fluid level is NOT low?
1) NOT replaceable...
2) try cleaning the sensor. Nothing special there, two metal probes covered by water.

It's not low. The light starts flashing the second the Rialta is turned on after checking the level.

I'll try cleaning the sensor otherwise i'll replace the orb.?

Thanks!

Check the 2 pair of connectors on the outside too.? Perhaps "scrub" them with left over pipe cleaner.?

Good tip on the cluster.? I believe that my cluster has bad connections also.? When I was working underneath the dash there, my cluster display went crazy due to minor movement of the harness cable.? I was eventually able to fiddle with it (was on the road) and get everything showing correctly again without repair but I believe it is a weak spot that wants attention.??

I guess that an easy way to check the coolant level sensor would be to pull the connector and check continuity across the pins on the orb while full and then drain, siphon or suction out (turkey baster/syringe) enough fluid to make it low and check again.? If continuity is different from full to say half full, then it's not the orb/sensor.

Oh - now I read that you did test it.? Good.? Easier to fix than the cluster.? I would definitely try cleaning everything first.

I tried to "clean" the sensor with some wire and when I refilled the orb the light didn't come on.

Going to try to suction out the excess and see if the light comes back on -- the sensor being dirty and not completely broken would explain it being intermittent at first and constant now. Also try the continuity with both variables. I hadn't thought to check it that way.

Just knowing that the problem is in the orb sensor and not the overall temperature is good news. I was always fearful that the temp gauge was misreading -- which is why we replaced all the other sensors when we were doing other work.

Thanks to all (especially Duane) for enlightening me about the red light issue. Gotta say I feel a bit ‘dumb’ to have not checked the coolant level straight away. Had no clue that the light was for monitoring coolant level. Wish I had an owners manual but bought the EV used and seller had lost it.
So thanks again and Happy motoring out there! :)

On Thu, Feb 23, 2023 at 01:10 AM, rhodney wrote:

Wish I had an owners manual

I've scanned a couple of them, one for AES and one for AXK.? You can find them at and
--
Duane
05HD Rialta
220K Miles

Hang onto those other sensors.? Sometimes having one to swap out can help with troubleshooting.? ?There are usually tests to confirm function.?

@dustinwhite

Curious to know your method to clean it.

I'm going to try on my 1993 as well.

I took a piece of wire and pushed it in the sensor hole inside the orb. Just did this a couple times. So far so good. There wasn’t really any better way (I could come up with) since the sensor is inside the orb and it’s a small hole. Thought it would knock off anything making it act weird.?

I used the same wire that I had just used to jump across the sensor terminals.?