Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: Peterskinn on 27 January 2016, 11:30:11

Title: Water Temp Gauge sender
Post by: Peterskinn on 27 January 2016, 11:30:11: .....and another thing!

Following the CH gasket change and associated work the car has continued to run well and the heater is great (faster to warm up if anything than my Diesel Jag)

When I did the work I soldered the spade terminal onto the sender unit at the rear of the cylinder head. My thinking was that this would be simple way of ensuring an otherwise dodgy electrical connection. I then used a simple choc-block connector to make the connection to the original cable in the loom.

Initially worked fine and registered on the gauge as you would expect as the car warmed up and settled to its operating Temp. But soon..... nothing! The needle doesn't move off the lower stop.

I've checked the connections - all OK - and now suspect the sender unit which I would imagine is relatively easy to change?? I notice that the brass stud (to which I soldered the tab) can be rotated. Is that correct??

Anybody any other suggestions??
Title: Re: Water Temp Gauge sender
Post by: Andy B on 27 January 2016, 11:32:20: Quote from: Peterskinn on 27 January 2016, 11:30:11
....
I notice that the brass stud (to which I soldered the tab) can be rotated. Is that correct??

Anybody any other suggestions??

I'd say not.

'Earth' the blue wire that should go to the temp sensor & the gauge show go to HOT :y
Title: Re: Water Temp Gauge sender
Post by: Peterskinn on 27 January 2016, 13:04:30: Great - I'll try

Just as soon as it stops blowing a gale!!
Title: Re: Water Temp Gauge sender
Post by: Peterskinn on 19 February 2016, 15:23:12: I'm confused now.....

I earthed out the temperature sender - no visible effect whatever.

Just to be clear - there are two "senders" one I understand is warning light and one sends to the temp gauge in the dashboard??

One has the little brass disc onto which a "Faston" tag from the wiring loom fits, the other has a small plastic plug.....

Which is which??
Title: Re: Water Temp Gauge sender
Post by: RobG on 19 February 2016, 15:27:56: Pic of a 2.0 set up. 2.2 same but no dispack
(http://images.omegaowners.com/images/guides/2.2_useful_pics/Tempsenders_resize.jpg)
Title: Re: Water Temp Gauge sender
Post by: Peterskinn on 19 February 2016, 15:40:28: Ah Thanks - but I'd found this pic.

I'm still unclear from the pic which is which though............

My concern is that the gauge on the dashboard doesn't work at all.

In infer that this is the small brass item - so what does the item with the plastic plug do??

I just don't want to replace the wrong unit??
Title: Re: Water Temp Gauge sender
Post by: VXL V6 on 19 February 2016, 15:51:33: Tells the Engine management unit the Coolant temp so it can work out fuelling / air ratio etc.
Title: Re: Water Temp Gauge sender
Post by: Peterskinn on 19 February 2016, 16:15:06: Ah Great Thanks!

So - if i replace the little brass widget ( £3.07) there's a half decent chance I'll have a temperature gauge?

Still strange that nothing happens when "earthed" though?
Title: Re: Water Temp Gauge sender
Post by: Andy B on 19 February 2016, 17:26:51: Quote from: Peterskinn on 19 February 2016, 16:15:06
...

Still strange that nothing happens when "earthed" though?

ignition on ...... ::)
Title: Re: Water Temp Gauge sender
Post by: Peterskinn on 19 February 2016, 17:27:31: Yup
Title: Re: Water Temp Gauge sender
Post by: Andy B on 19 February 2016, 17:40:24: Quote from: Peterskinn on 19 February 2016, 17:27:31
Yup

could be the gauge that's goosed then :-\
Title: Re: Water Temp Gauge sender
Post by: 05omegav6 on 19 February 2016, 17:51:21: You did earth the wire and not the sensor... :-\
Title: Re: Water Temp Gauge sender
Post by: Peterskinn on 20 February 2016, 09:22:11: I think for £3 or whatever I'll just buy one and see what happens........

I'll report back.

Thanks again to all!
Title: Re: Water Temp Gauge sender
Post by: Peterskinn on 04 March 2016, 14:11:59: So - duly ordered a sensor and - eventually - got around to replacing it yesterday .......... No change. :(

Is it likely that the gauge itself would just pack up?? Is there any wiring/plugs in the circuit that are worth a check??
Title: Re: Water Temp Gauge sender
Post by: andrew38 on 04 March 2016, 16:58:51: I have the 2.6 V6 same problem, mine packed up after a thermostat change, worked for a while then stopped. It does occasionally come off the bump stop but only when accelerating hard. I live with it as the cooling fans all work fine and the car runs great. I thought it may have been an airlock but then that would effect the ECU sensor beside it as well I would guess.

Garage did as you did, changed the brass sensor but no different, think they earthed it out and it was ok.
Title: Re: Water Temp Gauge sender
Post by: JoeRadosavljevich on 04 March 2016, 17:39:08: My car had the same problem when I bought it the temp gauge did not work, upon closer inspection figured that the wire has come off the sending unit. It's only one wire on 2.0 and it has to be snug. You should check again.
Title: Re: Water Temp Gauge sender
Post by: Peterskinn on 06 March 2016, 17:22:18: Thanks for the advice - always nice to know you're not alone!!

Like yours the car otherwise runs/works fine - so I'm inclined to leave well alone!
Title: Re: Water Temp Gauge sender
Post by: JoeRadosavljevich on 07 March 2016, 06:33:31: Yeah, I see your point but it just looks nice when all the gauges work :y
Thankfully omega gauges are awesome! sometimes I wish I owned Catera instrument clusters
Title: Re: Water Temp Gauge sender
Post by: Peterskinn on 05 July 2016, 20:24:38: Well - here's a funny thing........

For no apparent reason that I can think of - with the possible exception of some slightly warmer weather - the gauge now works!!

Seems stable at about 80 deg indicated most of the time, moves off the stop after about two miles and goes up in traffic - all the things you'd expect really!

Proof if proof were needed - the gremlins are still around!!

;D