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

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2 answers
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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