Ambient temp sensor problem

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Nov 1, 2017 | 03:39 PM

Andrew K

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Ambient temp sensor problem

Sensor normally always reads 69 and that causes no problem but when it goes to -14, my ac will not come on. only heat in South Texas when outside temps are in the 90's

Last edited by Andrew K; Nov 1, 2017 at 03:40 PM.

Nov 1, 2017 | 03:41 PM

pewter99

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moving to C5 Tech

the sensor underneath by the radiator (right front) is bad, connection is loose/bad

try removing it, cleaning and plugging back in

I will try and find the reset procedure for the unit too and post it here

Nov 1, 2017 | 03:43 PM

Andrew K

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Quote:

Originally Posted by pewter99

I did buy a new one and plugged it in but did not calibrate or anything to reset

Last edited by Andrew K; Nov 1, 2017 at 03:43 PM.

Nov 1, 2017 | 03:46 PM

pewter99

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When the Front Defrost, Rear Defog and fan up buttons are pressed simultaneously. Updates temperature display instantly

Nov 1, 2017 | 05:34 PM

Andrew K

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Quote:

Originally Posted by pewter99

When the Front Defrost, Rear Defog and fan up buttons are pressed simultaneously. Updates temperature display instantly

when I did that it went to -40. any more suggestions? thnaks

Nov 2, 2017 | 07:26 AM

lionelhutz

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Check the connector and wiring. The sensor isn't connected to the control unit.

Nov 2, 2017 | 09:58 AM

Andrew K

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Quote:

Originally Posted by lionelhutz

Check the connector and wiring. The sensor isn't connected to the control unit.

Is there a second connection between sensor and control unit other than where sensor plugs near radiatior passenger side that I can check?

Nov 2, 2017 | 03:43 PM

pewter99

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ok, sounds dumb but.....have you tried disconnecting the neg battery cable for 5 minutes and reconnecting

many things on the C5 will reset when you do this when all else fails