Air conditioner temp is fluctuating

SpeedUp

Silver Supporter
My 2008 AC temp seems to fluctuate when driving. It never gets warm, but you can definitely feel it fluctuating temperature.

It has always blown super cold (even on hottest days) but has been fluctuating for a few weeks.

Wanted to see if this was a common thing, and what I might start checking.

I have never serviced the system, so that seems to be a good place to start maybe? It also has the original non-electric fan clutch. I replaced the thermostat this past december.

any advice greatly appreciated
 

Mooseman

Moderator
For starters, you should check what kind of pressures you're getting to see what your charge is like. It may be low. You need a set of gauges to do this properly.

Another possibility is your clutch is getting worn and weak, slipping as it gets hot. If the gap in the clutch is excessive, it can slip.
Air conditioner clutch shim removal
 

Mooseman

Moderator
You would see and hear it while operating. And if you look at the gap, if it's more than say, the thickness of a dime, I'd remove the shim.
 

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