what could cause this? on 1997 Ford Escort

MY air used to work,right before it got cold,then used heat,worked fine,went out,no,air,defrost,nor heat.IS this just the thermostat.What do ido.need to get it resolved,before it snows.Please help.

Asked by for the 1997 Ford Escort
Do you mean the blower fan does not work?
I dont know.the heat nor the air comes on.could this just be the thermostat?
Need to have fuses and relays checked. If they are ok have the blower motor checked.
Thermostat is not the reason fan won't blow.
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need more info to assist
the air nor the heat will blow.could this be the thermostat?