Sorry I haven't been back in a while but life took a hold of me (mostly midterms). I forgot to mention this is a 4 keg kegerator.
I run Killians, Bud Light, Heineken, and other random Euro brews that my local store has on sale (from time to time).
I think the best way for me to answer all this is by quoting and answering some questions you had so you guys can help me.
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Is the cooler box 38 degrees F. or below?
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It is an old kegerator and the weather seals on the doors are worn out, I will be replacing them this year as time/money permits. Yes, to be safe we do keep the thermometer at 38 degrees F at all times.
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If so, is there a tube blowing air from the box up into the tower(s)?
Is there a fan blowing up the tube? Is it working?
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No there is no fan, there is a refrigeration block built into the a/c system that runs up the tower and alongside the tubing keeping the liquid in the tubes nice and chilled.
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Check-- Use a pitcher and open the faucet. Does it foam and then clear up? This would mean the box is cold enough, but that cold air is not getting up into the tower.
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It depends on the beer, we keep the c02 tank outside of the kegerator as the previous owner did the hosing that way. I don't know what we could do to make sure the air is getting up there cold.
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If the temperature is OK, what do you have the gas pressure set at on the regulator? CO2 should never be turned up higher than 15 psi. Turning the pressure down too low will also cause the beer to foam, as the pressure cannot suppress the gas in the beer, therefore it foams.
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The c02 is set at 10psi, we moved it up to 13 for a while but the foaming was worse on the Killians when we run that. We usually have two kegs of Killians and two kegs of Bud Light in the kegerator. In this instance we have two very different types of beer, what would you recommend for that kind of setup?
We have run about 16 kegs through the system as of now and we are going to run another 5 through it tonight. I will lower the temperature to 34 degrees and see if that makes a difference.