XJ40 ( XJ81 ) 1986 - 1994

radiator warning light

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Old 11-05-2020, 05:40 PM
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Default radiator warning light

Its staying on despite adequate coolant and not overheating. Any ideas folks? Even bought the little coolant sender probe that goes in the top of the rerevior so thats new but the light is still on.
 
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Old 11-05-2020, 09:30 PM
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Sure it's not the low washer light?

Just an idea, knew a guy who mistook the washer fluid light for the rad light

Larry
 
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Old 11-06-2020, 05:53 AM
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lol well you never know ill check that!! Fixed the boot ajar light as well...moved striker down with a couple of taps of the hammer...after slightly loosening retainer bolts. Now its tght and light is off...and i think the battery was draining because the boot light was on so hope thats ok now
 
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Old 11-06-2020, 05:42 PM
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No its not the washer level warning light ...lower rh side radiator light
 
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Old 11-06-2020, 08:55 PM
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Originally Posted by mickvic
Its staying on despite adequate coolant and not overheating. Any ideas folks? Even bought the little coolant sender probe that goes in the top of the rerevior so thats new but the light is still on.
Try disconnecting the coolant level sender and grounding the Orange wire with Purple tracer line. If your warning lamp extinguishes, there may be a problem with the new sender or with the black ground wire.

Test the black wire at the sender for continuity (low resistance) to a good ground, such as the ground point on the left inner wheel arch.

Test the sender by checking for continuity across the two terminals in the sender connector. The schematic shows the sender as normally closed, but it may require a magnetic field to close (I seem to recall that it is a reed switch).

The Orange/Purple sender wire connects to the Instrument Cluster by way of a black 36-way connector either in the left dash area or behind the left footwell side scuttle trim at the base of the A-pillar. If your other tests are inconclusive, it might be worth disconnecting and cleaning this connector with zero-residue electronic contact cleaner.

Also, since you're having trouble with your Instrument Cluster lights, it would be worth pulling your IC and cleaning and re-seating the electrical connectors on the back of the cluster. It could be that the same connector that is affecting your lighting is also interrupting the coolant low sender's circuit to ground.

Cheers,

Don
 
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