Tank gurgles when doing zilch, any suggestions? It's is winter and unusually cold this year (don't know if that...

It's is winter and unusually cold this year (don't know if that makes a difference). My toilet downstairs (not within basement) gurgles all the time. Does not event if you flush or not. When I took the lid off it is coming from the spread hose. When flushing toilet does not move slow nor do any of the other toilets, sinks or tubs. Does anyone have any suggestions? I thought perchance a partially clogged column or improper vent but they use the same procession just different vent in the finish.
Does anyone know if here is assistance available...
Answers:    My sister had this problem at her apt. and it be because the toilet and the upstairs neighbors kitchen sink were hooked up to alike line. She would even win bubbles after they washed dishes.
The wet dispenser merely works when pressed beside...
This sounds approaching two seperate problems. When you hear the gurgling, is any other water fixture man used? Is the water contained by the bowl moving? If so, the main vent is clogged. Toilets are usually connected directly to the foremost vent line. Could be a spiderweb near frozen condensate forming an ice blockage. I don't know why the cram hose would cause this except if the crawl valve have deposits built up in it and is leak very slightly to trademark the noise.