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I have a 2002 Trailblazer. For the past several months, the anti-lock brake light has stayed on sometimes. The local dealer said we needed a new anti-lock module (at a cost of $900+) but the problem appears to be electrical, not the anti-lock brake module. If the antilock light stays on, the heating/cooling fan does not work either. Starting the car before putting on seatbelts prevents the light from coming on - sometimes. It may go out after a few minutes of driving; other times it stays on for the whole trip. It is very frustrating. Anyone else had this problem?
 
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