I tried opening it all the way and closing it, several times.  It still is not wooshing but there is a slight smell.  So I've not used it and am using a small ceramic heater.  It got down to 53 2 nights ago.  At least the electric blanket worked well.  Last night it was 63, better.  2 more nights to go. 
I have made many calls and found a gas place and an RV place that would take a look at it.  Hope to take it in next week when I get home.  I am not going beyond what I did.  I asked all I called about replacing the tank and none would.