outside air temp inaccurate

[Jimbo]

So ever since i bought the car its never worked properly, it always displays a temperature but lets be honest its not -23 degrees outside (thankfully).

Now i have changed the passenger mirror for another one i had spare, but still no different 

Then i swapped the actual clock unit itself in the hope that there the only two parts to make this work.
I know its not faulty wiring in the door loom otherwise it wouldnt display at all. 

Mirror and clock both spares i had and unsure of there condition just kinda hoped that i wouldnt have two faulty units. 

Anyone shed any info/light on what to check next
Cheers 

[Niall]

Could easily be faulty wiring. If its a broken wire causing high resistance, the temp sender will give an incorrect reading.

[Jimbo]

Yeah true, sometimes its believable bust most of time its clearly wrong. Bit annoying really.

Will have a look at door loom, not gonna disturb it too much though incase stuffs gone brittle

[DeeTurbo]

Have a look for corrosion on the mirror plug your on the door loom plug.

[Jimbo]

Good shout dee, will have a look there too

[cully]

open the passenger door with the ignition on to see if the value changes if it does its a good indication of the door loom fractured but not broken

[Jimbo]

Soo....

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[cully]

yup that would do it