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you don't adjust the idle for any accessories
The idle is set for smooth running of the engine( normally 750-900 rpms with a drop of 200-300 rpms with an ac running so set the idle at the upper rpms and it will still be smooth when the ac is on without affecting gear engagement
your problem I take it is that when the ac cuts in the idle rpms drops and makes the engine run rough
This is normal as the ac compressor takes up to 5 hp to drive it
what you need is an electric controlled vacuum pot connected to the accelerator lever so that when you switch on the ac the power to the ac clutch energizes the pot and vacuum pulls the accelerator lever to maintain the set idle rpms
such an item is found on most early carby operated engines
I am thinking that the idle rpms are too low and the tune up is not good enough to compensate for the drop in rpms when the transmission is engaged
normal idle rpms on an automatic should be around 850rpms as they will drop 250rpms on gear selsction
any idle speed around 500 rpms will die when fear is engaged
What's happening is, the engine is under increase load when the A/C is running. Typically there is a solenoid (near the throttle linkage) that controls idle speed when the A/C compressor (clutch) is engaged. It activates each time the compressor cycles on to regulate the system. If idle returns to normal when A/C clutch is disengaged (or A/C is off), then the solenoid or some signal that controls the solenoid to maintain the idle is the likely to be the problem. e.g. The solenoid fuse maybe blown. This might be a good place to start investigating the problem. Best of luck resolving this problem.
if the engine stalls when ac is on then there is a problem with the ac pump bearing could be sized, the ac pump has a clutch and this engages when ac is activated, there is usually a small drop in engine idle but should not stall the engine unless the engine idle is to low. should be around 880 rpms idle with the ac on,
sounds like the clutch isnt engaging properly in the situations you described. may need to check fluid levels if there ok. then may need to get serviced or checked at least
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