Odd idling when A/C on - Air-Con / Heating (Mk1/Mk2 Mondeo) - TalkFord.com

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Odd idling when A/C on

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#1 boblemus


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  • Vehicle Driven:Mondeo MK2 Zetec 1,8
  • Name:Allan Jensen
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Posted 21 August 2015 - 01:00 PM

So I have discovered that something is awry with my A/C.

Car - Mondeo MK2 Flair 115 hp, Zetec 1,8.

When A/C is not on the car idles steadily and throttle follows the pressure on the pedal.

But when A/C is on, idling is normal for 5 seconds (around 1100rpm), then it jumps to 1600 for a second, then down to 1100 again for 5, up to 1600 for a second etc.

Also when driving I sense these one second burst boosts on the throttle.


A/C doesn't seem to cool much so regassing is certainly coming up, but any suggestion to what's the reason behind the odd throttle behaviour? 


Thank you for all suggestions!


#2 Squirt


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Posted 21 August 2015 - 01:46 PM

Sounds as though it's just the engine coping with the demand from the A/C compressor, (albeit slightly excessive) if the system is low on gas it will switch in and out much more frequently.

Get it regassed and it will be less apparent although still there.
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#3 Hearsepilot


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Posted 12 September 2015 - 03:01 PM

The ECU gets a signal to tell it when the pump is active so that it can compensate. Try an ECU reset.

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