Hot weather is triggering car alarm – how do I fix it? | Ask Honest John

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Hot weather is triggering car alarm – how do I fix it?

The hot weather is triggering the alarm on my 2009 Ford Mondeo TDCi 140 Estate. It goes off at 10pm and 4am, everything else with the car is fine, and the problem has only started with the heat wave. Do you have any suggestions?

Asked on 21 July 2013 by rogie

Answered by Honest John

The alarm is triggered due to air pressure variations inside the car. You can minimise these by switching to recirculate, closing all closable vents, switching the heater to max heat, and directing the directable vents to the footwell.

Tags: alarms and immobilisers technical issues

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