why when in gear idling and you turn ac on or heater on does it rough idle


Asked by Aug 19, 2014 at 04:19 PM about the 2001 Ford Escort

Question type: Maintenance & Repair

car runs fine ac on works fine but when at stop sign it runs realy rough when i use heater it also does this?

6 Answers


Sounds like your idle air valve is not compensating for extra load from AC compressor be it a control issue or a physical problem with idle air valve it self. When you say heater do you mean defrost because AC generally works on defrost to dehumidify

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when i say heater i mean no matter weather i put the heater on for heat or i put ac to cool.the engine goes to a rough idle? turn the control knob to off and the engine runs smooth when idling in gear???

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Is the heater fan on when HVAC controls are turned on? Just double check that AC isn't turning on, open hood and watch compressor clutch. Verify it's not engaging . Possible fan lost could drag down alternator and put load on engine


i will check if the fan is turning on !cooling and heating works fine when turned on never checked fan?will do this now!get back to you and thanks.


checked fan.all is working well.when fan comes on ,rough idling?when fan goes off because i turn knob to off.smooth idle?would that make problem idle control valveonly???

1 out of 1 people think this is helpful.

I have a similar issue, I have a 2001 4dr Ford Escort 2.0, I found out that when I have the ac, heater fan off, ac fan to head n heater fan to feet, it won't revive every 5 seconds on a stop or red light. However, it will revive every 5 seconds for a second or two when on ac, max ac, heater fan to head n feet and window and feet. What could be causing reviving every 5 seconds lasting 1-2 seconds when in those ac or heater settings?

2 out of 2 people think this is helpful.

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