Any Fog Machine experts out there ?

Hey guys, goin out on a limb here, just wondering if anyone is good at trouble shooting fog machines, I had one given to me thats not putting out fog, its making heat, It sounds like the pump is either working or trying to work, and I can feel the pump vibrate a bit as well. I did take the inlet line off the pump and was able to flow a little bit of air through which managed to produce a bit of fog that way, so I know the lines arent blocked for that. I then took the line off of the outlet side of the pump and tried the button, I didnt notice any fog juice coming out of the pump that way, guessing maybe there should have been? Its a pretty decent machine, I would love to get it working so that we could use it at the Fire House for training, or even for Halloween, but I cant really afford to just buy a new pump at $100.00 right now, especially not knowing if that would be a fix.
by the way, its this one here ---> http://www.starlight.com/instructionsfogdog.html

If anyone knows a way to fix, or confirm the problem, that would be GREAT, if not, oh well, I tried, thanks for reading the post anyway !!

fixed, simple as cleaning the pump that they claim you cannot service on your own.