AC clutch engaging and then dis-engaging

[SHOIT0ff]

I just recently took my car out of hibernation and everything seems to be working fine. When i start my car in the morning my idle hovers at about 1500RPM then slowly drops down to 800 RPM. this i think this normal. But when i pop my hood and watch my AC clutch, it engages for a minute and the RPM's increase by 100 to 200 RPM..then 30 sec. later it dis-engages and the rpm drops to back to 800. it will continue to do this engage and then disengage with the whole RPM thing happening.

I dont know if it does this all the time but i am annoyed. I have searched all 17 pages on "AC clutch" but didnt find anything. I dont know if the "CCRM" is the culprit or if i am low on R12, but i do know it blow cold and doesnt act wierd at all.

If anyone has an idea i would like to hear. thanks

 

[llamaking122]

sounds like you need to take the clutch shim out

 

[SHOIT0ff]

what makes you think its the clutch shim? what does this shim do?

thanks

 

[llamaking122]

umm i forget completely but thats what they say will happen. heres a thread i started http://www.shoforum.com/showthread.php?t=108247

 

[SHOIT0ff]

I think you mis read my post. my ac works and my ac clutch engages no problem, no slipping or grinding. what its doing is engaging and then dis engaging almost as if i am turning my ac on and off.

 

[llamaking122]

I think you mis read my post. my ac works and my ac clutch engages no problem, no slipping or grinding. what its doing is engaging and then dis engaging almost as if i am turning my ac on and off.

ya thats what mine does. its the magnetic clutch gap

 

[lowc]

sounds like it works fine to me.. is it only doin it when ac is on?

 

[SHOIT0ff]

nope. it does it when its off. does it normally come on and then off like that? i thought that the AC clutch should only engage and stay engaged when the AC is turned on. Oh i should have mentioned my car is a 95 MTX. if this is normal then thank god but i would think it isnt.

 

[lowc]

when ac is on yes it is normal for it to cycle, as far as when its not on something is telling the compresor to turn on you may have a bad sensor in the ac system

 

[rubydist]

the accurate answer is that the a/c clutch will cycle with the eatc set to anything except "OFF" and "VENT". All other settings will allow the a/c clutch to cycle as the eatc determines need.

I would perform the idle reset procedure. this should make it so the idle speed difference w/ a/c on v. off is much less than you are now experiencing.

 

[CademiaX]

low pressure maybe? when was the last time you had your ac serviced?

Mine was doing that a few days ago...

 

[frosho]

the accurate answer is that the a/c clutch will cycle with the eatc set to anything except "OFF" and "VENT". All other settings will allow the a/c clutch to cycle as the eatc determines need.

FLOOR won't run the a/c either, unless you set it lower than ambient temperature.