Make sure it is FULL of coolant, if so check the heater hoses to see if they are getting hot, at least as warm as the upper radiator hose.
If all is good there you may have a blend door disconnected/broken under the dash..
__________________ No matter how carefully you choose your words, they'll always end up being twisted by others! 1993 Thunderbird LX 3.8L AOD.
1997 Explorer XLT 4X2 4.0L SOHC 5R55E
1997 F-250 HD Extended cab, long bed, 5.8L, E4OD.
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