fast idle

Asked by ABCCEM1950 Jul 17, 2018 at 12:25 AM about the 2014 Lincoln MKT EcoBoost AWD

Question type: Maintenance & Repair

Very hot day-100 degrees  air conditioning on--very fast idle-why?

2 Answers

43,860

That's normal for all vehicles to idle faster with the A/C on. This helps provide extra power to the A/C compressor and the engine stays cooler with water pump running faster. Check your tachometer. If it's idling over 1000 rpms then maybe that's a bit too fast. Base idle is probably 650 rpms.

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