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That's the way A/C works, your RPM's will drop when you turn on your A/C.

The pulley is being spun all the time when the car is started and running (by the flywheel).
When you turn on your A/C, the clutch is pulled in onto the pulley and that turns the compressor.

There are 10 pistons in our compressors.
It takes alot to compress gas (freon/suva) to liquid.

If you feel that the car is too sluggish, you should get the A/C system checked out. Get the HI and LOW side pressures and note the temp and humidity when they are taken.
 

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Roger said:
what would the pressure check indicate, cause i have a pressure guage for the AC to add r134a and i have this power loss when the AC is on
It would indicate if the system is:
i) overcharge/undercharge
ii) if the compressor is loosing pressure (ie bad reeds)
iii) blockage in system (could make compressor work harder)

The pressures along with the ambient temp, vent temps and humidity would point you in the right direction, instead of scratching your head and trying different things to fix the problem.
 
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