Defroster/compressor

Tiny
SPARKYRHETT
  • MEMBER
  • FORD F-150
91 Ford F150 Larado XL, 302 V8, pw, pl, cruise, 60,000mi.
My issue is, when I am running my defrosters, and the compressor engages, my charging guage drops below the normal range, and when it disengages, it returns to the normal range. My question is two fold. Why or what is making it do this, and why is it necessary for the a/c compressor to run while the defrosters are running. I am mechanically challenged but it appears something may be astray. Can I unplug the compressor temporarily to keep it from cycling. Thank you in advance for any advice.
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Monday, January 15th, 2007 AT 6:01 AM

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Tiny
INDYUKE
  • MEMBER
The seals in your A/C system will deteriorate at a much quicker rate if you don't use the A/C system. You should run the compressor at least 5-10 minutes per month. However in the winter people don't tend to use their A/C and forget to run it, so auto manufacturers in order to maintain the longevity of a vehicle's A/C system tied the operation of the compressor to the defrost selection on the heater. People use their defrost a lot in the winter. So the A/C system will always be operated and thus maintained.

In order to activate the compressor, an electronically operated clutch is engaged. The reason your charging guage could be dipping is because of the draw on the electrical system when the clutch engages.

Your defroster should not blow cold air unless you have the temperature selector in the cold position.
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Monday, January 15th, 2007 AT 10:13 PM
Tiny
SPARKYRHETT
  • MEMBER
Thank you very much for the info. Sparky
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Tuesday, January 16th, 2007 AT 5:48 AM
Tiny
HEAVYDUTY
  • MEMBER
The A/C comp. Runs to remove humidity from the interior of the car to remove fog from the windows that we create when we breath in the cold. Ford gauges have a bad rep. For inacuracy. Test the battery voltage at the battery with the comp. On and off. You may have corroded battery cables or a bad connection at the starter solenoid beside the battery on the fender.
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Wednesday, January 17th, 2007 AT 9:51 PM

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