How Do I Replace a Thermostat on Chevy S-10 Pickup on 1998 Chevrolet S10

its blowing out cold air and the windows are frosting over inside

Asked by for the 1998 Chevrolet S10
I'd not be too sure that it is exclusively a thermostat problem . Is your antifreeze reservoir up to the full mark , & does the engine temp gauge register up to operating temp ? or is it down on the cold side ? If it registers on the cooler side of the gauge & the fluid is low you may have an antifreeze leak - perhaps the heater core if the windows are fogging .
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