Question for the OP.
When you turn the AC on and your idle rpm drops due to the drain on idle Hp, what else would you expect to take place?
1) you have added another load to the motor.
2) with a engine driven fan and the drop in idle rpm you have cut back on air flow.
3) you have slowed down the water pump and the circulation rate.
As posted I would at least add a solenoid that that kicks in when your compressor does to up your idle
speed .
Hint, if your AC stays somewhat cold even though your idle has dropped, and you have some temp creep then that’s a sign that your air flow rate is not too bad, but at idle your water pump’s circulation rate
could be better.
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