Can't be the regulator. I have a box full of them as "spare parts." All new. Makes no difference. They all freeze up when the temps get right.
I'm no expert on this subject, but I can read and research like anyone else. This is what I've read on this matter:
"In localities where winter temperatures are extremely low, attention should be given to the setting of the first-stage regulator to avoid the possibility of propane vapors condensing into liquid in the line downstream of the first-stage regulator. For instance if temperatures reach as low as -20°F, the first-stage regulator should not be set higher than 10 psig. If temperatures reach as low as -35°F, the setting of the first-stage regulator should not be higher than 5 psig.
The easiest way to cure this type of freeze-up is to keep as much moisture as possible from your fuel. Adding genuine absolute anhydrous methanol (99.85 pure) to your tanks when you first fill them is extra insurance to prevent freeze-ups from any moisture that may still be in the new tank. Methanol will lower the freezing point of water sufficiently to prevent freezing. When mounting the regulator, be sure the regulator outlet is higher than the service valve outlet. If pigtails are “looped,” be sure the loop is upward, preventing moisture from collecting and freezing at the bottom of the loop. Many times regulators are blamed for freeze-ups when ice frozen in the pigtails is the cause. Use larger pigtails ( 3/8 ” OD hogtails have more than three times the cross-sectional area of the standard 1/4 ” pigtail). Two-stage regulation helps prevent freeze-ups
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