Street King

That is what I have heard also. It's the PFC version.

airborne

pfc version as in software or hardware king?

Street King

Not sure because I do not own a PFC but there is different model versions. I'am guessing the hardware because you can't interchange commanders with a different version of the PFC.

airborne

i think its hardware too. oh well, i only rarely use the AC and thats on the highway so no issue.

bought my pfc from SR motorsports back in 2001, how bout the rest of you who are having issues.

dis1

I had this problem. I found that the clutch switch was the cause.

ronarndt

Check the hi side pressure on the A/C. If there is an exess load against which the compressor has to work to start when it cycles, it creates a drag against the drive belt and can stall, or nearly stall, the engine. If the pressure gets too high, the hi pressure cut-out activates and frees up the compressor. This gives the surging idle speed effect. The excess pressure can be caused by an over charge of refrigerant or contaminants in the refrigerant. Not sure what the exact pressure for this to happen could be, since the overall condition of the compressor will be a factor. With most of the FDs getting older, there are a lot of compressors out there that are now only operating at 50-60% of their original efficiency. In my case a new compressor fixed the problem. Short of replacing the compressor, you may want to replace just the receiver/drier after a pressure flush to clean out any crap in the system. If you have changed to R134 without doing it the proper way, this may be the problem anyway.
Ron A.

redrotaryrock8

how much would it be for a new compressor.

btw: if i increased the intensity of the a/c the a/c stops cooling all together. i have to keep it at 1.

i will try the clutch switch and will post the findings on this thread.

ronarndt

A new compressor will run $350-400, depending where you buy it, plus installation, if you do not do it yourself. Re-built should be slightly less. Ron A.

ska*utomatic

iTrader: (3)

I like this idea. I know my clutch switch is bad and my a/c doesn't make the idle oscillate but just makes it stall at stoplights. i'll have to look into this.