Auto Air Conditioning & Heater Repair: no heat or defrost 2000 Chevy Blazer, radiator hoses, chevy blazer

Question
Put new thermostat in.  Still no heat just cold air blowing in.  

Answer
What mechanical work has been performed on the vehicle recently ?. As most problems that occur after a recent repair was made can be traced back to the area of where the repair was made.


Are the heater hoses and radiator hoses HOT to the touch when the vehicle is at normal operating temperature ?.

Is the COLD air going out of the proper vents when you select DEFROST, FLOOR, PANEL, etc,etc ?.

Write me a bOOK about what it is doing and NOT doing.


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