what could cause this? on 1997 Ford Escort

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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.
(2) Answers
(3) Comments
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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