Dark Belgian ales never taste good cold. Same with imperial stouts, barleywines, doppelbocks and other heavier beers. They are supposed to be served closer to room temperature to get the full flavor and body. If you drink an abbey ale cold, you miss out on much of the creaminess and flavor. They just don't taste good cold. I mean, you can drink them slightly chilled, but definitely not straight from the refrigerator. The serving temperature should be listed right on the bottle.
You can try it out for yourself. Try drinking one cold, then try it after it's been sitting at room temperature for a while. See for yourself what tastes better.
I just looked and it says erve at 50 degrees farenheit. idk how i would know when it hits that temp though.