Chevrolet Repair: heating, chevy s10 blazer, s10 blazer

Question
I have replaced the thermostat on my vehicle and it still blows nothing but cold air..what else do I need to check?    Its a 2000 chevy s10 blazer

Answer
The only other 2 most common faults are:

1. The temperature selector switch on the dash.

2. The DAMPER DOOR control module under the dash at the haeter core hosuing.

BOTH items require TESTING by a qualified technician in order to determine WHICH one is at fault.


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