[Jag Daddy]

Can someone tell me why Fords' air conditioner compressors turns on and off for a couple seconds at regular intervals at idle even though the air is not turned on? Seems to be a waist of HP, I don't know if it does it at full speed since the hood is down.

Regards
Mark

[woodz428]

Sounds like the pressure switch is kicking it off because of roo high pressure. I don't recall that my 5.0 GT did it.

[propaniac]

Is this compressor on your Jag? I had a similar problem on my Blazer. Turns out the climate control switch had gone haywire. Had to have it set on heat to turn off the compressor. This time of year where I live the compressor runs all the time anyway (120 degrees yesterday)

[BstMech]

I know that if you use the defroster, the A/C will engage. Ford did this to expand the sytems longevity by making sure lubricant was distributed through the system even during the cold months when air isn't used.

[woodz428]

OOPs, I misread the initial post,I thought you meant when the A/C was on. I think all the mfg.'s now use the A/C for defrost, it's my understanding it is to help dehumidify.

[Jag Daddy]

No, the compressor is in my Explorer. It just seems funny to me that it turns the compressor on and off.

Regards
Mark

[propaniac]

All the fords that my families business had the compressor only came on when the a/c was on (or the defroster). I would suspect you might have some sort of short or something.

[2-manytoyzs]

Compressor should not be cycling with the switch in the off position. Some Ford a/c systems will operate the compressor in everything but the off and vent positions (depends on the application). Possibly a bad switch of incorrect wiring. The main reasoning is for dehumidify function.