my jeep over heats and heater blows cold air

1998 JEEP CHEROKEE
250 MILES
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CHINOBALLZ
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so the other mornin i started it and heated it up started drivn and relized the windows stop defrostn i then noticed i was over heatn i pulled over and popd hood the rad valve was steamin so i shut off and parked it i came bak to it later thinkn it was low on anti frezze but it wouldnt let put lots in i started it and tried the heater and the fan worked but blow cold air . it was minus 37 when it started messin up
Jan 19, 2012 at 5:59 PM
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DOCFIXIT
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Couple possibilities thermostst stuck closed or coolant frozen
Jan 19, 2012 at 6:53 PM