03-06-2017, 11:13 AM
Have had the same issue with ours off & on over the years. I haven't decided if it's temperature related or just some stray debris that once in a while gets caught up under an air leveling valve. The higher rate of flow from engine compressor I think may be blowing debris on past valve seat. I usually only notice it between 25 to 38 degrees F. But may not be paying much attention in other ranges. Also, it is not a continuous issue.