AC intermittent when turned on... cuts in and out

[ApexVIII]

my AC wokred fine, then i installed a B16G and SSAC FMIC.
ac worke3d great after the install for 2 days, now it is intermittent, when the AC is turned on, the AC compressor will turn it self off then back on,

if the car is under 2500RPM's it seems to stay on longer then when in at freeway speeds around 3300+


any ideas? it worked gret befor the install, i dont know if that might have anything to do with i
and when the ac is turned on and working it works great

i also had a pretty bad oil leak from the oil pressure sender, so oil could have gotten all over the ac compressor (i dont know where that is)

thanks

 

[delta448]

I'm not sure, I don't use my AC much, but there may be a protection feature for the compressor when it gets too hot or if there's too much pressure in the lines. If you add a FMIC, your AC is almost guaranteed to struggle since the condenser is getting less airflow. BTW, the compressor is mounted directly to the back side of the engine block.

Those repair kits suck IMO, I never could get them to work right.

So, the only thing you're concerned about is that it's turning on and off? -I'm pretty sure that's normal.

Oil could have gotten on the compressor and its drive pulley, but I doubt that is causing you any problems. My curent engine's front case is leaking oil pretty badly, the timing belt side of the engine bay is completely coated and my AC still works as good as it ever did.

 

[ApexVIII]

ohh i see,

with the AC button pushed down, the AC compressor will turn its self off and on, it will work for like 5 sec then shut its self off for different amount of times like a few min, so the air that should be cold gets hot.

so basically the AC will turn its elf off so it is nolonger putting out cold air, then turn its self on.

and for some reason if i shut the car off and drive at low RPMs like under 2500 the ac will stay cold longer.

 

[casperfast]

there is a feature on most ac systems that will kill the compressor when idleing with wheels turned all the way and load from the powersteering sys. also it can cycle on and off in the drfrost setting using th ac to remove moisture in the inside. also allmost all ac systems disengage at wide open throttle

 

[ApexVIII]

yea but it mot at wot thats the problem, im just regular driving, just cruzing at any speed.

 

[bluetlr2001]

Have you took it to have the freon checked. It sounds like you may be low on freon. When the ac system gets low it will cut on and off. Even though you said it worked before you may have knicked a line whiel you were doing the fmic and turbo install. Since the condensor is now right behind the fmic you may have bent a line and cracked.

 

[ApexVIII]

i have not had it checked yet, i am going to tomorrow, thats what i think it is.

i was really really careful to not hit it and i dont believe i did, but it is possible.

ill check tomorrow and see if it is low and get some if it is.

ok i checked the low side pressure level and at idel ot moves back and forth from 30-35 and a little rev it jumps to 40ish,

what should it be at?

 

[delta448]

Checking the refrigerant charge:
-Warm the engine to normal operating temp.
-Place the AC temp selector at the coldest setting and the blower at the highest setting. Open the doors (to make sure the system does not shut off as soon as it cools the passenger compartment).
-While the compressor clutch is engaged, note the temperature of the inlet and discharge lines at the compressor. If the compressor inlet line feels cool and the discharge line feels warm the system is properly charged. Place a thermometer in the AC duct closest to the evaporator, the air temperature should eventually be measured 30-50 degrees F cooler than the ambient air.

So apparently, the compressor is supposed to cycle on and off.

 

[ApexVIII]

So apparently, the compressor is supposed to cycle on and off.

yea they do turn on and off, but mine will be on for ~5secconds then off for ~5minutes

so it does not stay cold in the car, at all. i think the low side pressure is low (its at about 30-35psi and it was a bout 85-90deg out side when i cheched it)

 

[TALONTRAX]

There is an a/c clutch cycling controller/evaperator temp sensor in a 2G system. How it works is the temp sensor is located in the a/c box at the end of a wire connected to a little box(remove the glove box & it`s right there). Mine went bad & caused the compressor to run full time & that allowed the evap. to freeze up & block airflow through it. I`ve also seen them fail, & not allow the compressor to run at all . . .

 

[ApexVIII]

There is an a/c clutch cycling controller/evaperator temp sensor in a 2G system. How it works is the temp sensor is located in the a/c box at the end of a wire connected to a little box(remove the glove box & it`s right there). Mine went bad & caused the compressor to run full time & that allowed the evap. to freeze up & block airflow through it. I`ve also seen them fail, & not allow the compressor to run at all . . .

so it would either be on full time or not at all?

mine is the opposite, when the AC switch is pushed in, the ac clutch will kick on for a varying length, then shut off for a while, then turn back on... and so on.

 

[Defiant]

If you aren't low on freon, suspect your AC control unit.