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1 29th July 15:52
john manner
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Default 1999 Blazer 4x4 Problem


I have a Blazer that refuses to shift into 4x4 when it is cold outside.
During the summer, it shifts perfectly fine. Because of this fact, I'm
thinking it is the shift motor. I would love to pull the code on it,
but my scan tool will not read ABS or 4x4 codes, only a Tech2 will do
that. You also can not ground a terminal on the scan port to flash the
codes. Any help would be welcome.
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2 29th July 15:52
adam f
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Posts: 1
Default 1999 Blazer 4x4 Problem


sounds to me like u may be right, but does it have the 4 button system or 3?
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3 29th July 15:52
john manner
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Default 1999 Blazer 4x4 Problem


It has the 4-button Auto 4x4 System
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4 29th July 15:52
adam f
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Default 1999 Blazer 4x4 Problem


Probally the same problem, the TCCM is going out.
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5 29th July 15:53
john manner
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Default 1999 Blazer 4x4 Problem


You had the same issue? It worked find in the summer, but had problems
in the Winter?
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6 29th July 15:53
adam f
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Default 1999 Blazer 4x4 Problem


yeah and in the winter, it quit working completely and never worked again
till we bought a new computer for it.
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