XJ6 & XJ12 Series I, II & III 1968-1992

coolant level sensor

 
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Old 08-01-2014, 03:09 PM
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Default coolant level sensor

I think mine has gone bad, if i ground the wire to the body the light goes off! other than that i cannot make it go out! how does the sensor work? is there another wire somewhere that gives it a ground? I even tried dropping the wire into the coolant thinking that maybe the ground travels through the coolant.
What am i missing??
if the sensor is indeed bad, how does one remove it? doesnt look to be threaded to me!
 
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Old 08-01-2014, 03:47 PM
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DELETED: so incorrect answer doesn't appear in searches.
 

Last edited by Mkii250; 08-02-2014 at 02:27 PM.
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Old 08-01-2014, 04:41 PM
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for some strange reason my phone is not talking to my laptop so i cannot upload picture. maybe sensor os the wrong word, sender perhaps?? its a single spade connector on front side of coolant fill tank! turns on a light on the dash that looks like a radiator! i googled coolant level sensor and it came up! but doesnt tell me how it works!!!
 
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Old 08-01-2014, 06:39 PM
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The coolant level sensor/sender in the header tank works in conjunction with the 'low coolant unit' in the dashboard. Together they conspire to operate the warning light.

The low coolant unit is a cylindrical device in the RH component panel behind the glovebox. I really don't know how it works.....never had reason to open one up and see what makes it tick. You can see the illustration and wiring in the S57 Wiring Guide.

Cheers
DD
 
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Old 08-01-2014, 06:51 PM
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Here's what the coolant level sensor/send looks like. It's a press fit into a rubber bushing. Part C43222


Jaguar Coolant Level Sensor (XJ6 XJS Vanden Plas) - Genuine Jaguar C43222 | FCP Euro

The diagram shows that it makes (or perhaps breaks) a ground path...presumably thru the coolant itself? I dunno....but there doesn't seem to be any other way.

Often removing the sensor and giving it a good cleaning will put things right....but make sure you have a new rubber bushing first, part C43221



Cheers
DD
 
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Old 08-01-2014, 06:56 PM
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Here's a pic of the DAC2812 control unit....the one behind the glovebox

Jaguar XJ6 Low Coolant Transmitter RKC5259 DAC2812

Earlier Ser IIIs (1982-earlier?) apparently had a rectangualr control unit, it seems.

Somebody will come along who knows how this unit works

Cheers
DD
 
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Old 08-01-2014, 11:06 PM
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Doug, you got me again. I'll just shut up now.
 
 
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