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Remove the coolant reservoir. Remove the rear coolant recovery reservoir mounting stud. Disconnect the cooling tube from the blower motor. Disconnect the electrical connector. Remove the 5 blower motor and fan assembly mounting bolts. Remove the blower motor and fan assembly. Reverse proceedure to install.
The 2000 4.3 will fit in the Blazer. If the engine previously in the Blazer was a 4.3, it should be a direct changeover. Any parts differences you can use the parts off the old motor to make it work. Some connections may be different, but can be worked around.
It's not worth doing all that conversion, buy the time you spend the time and money to convert the 89 4.3 to work on the 98 blazer, it would be cheaper to install a 98 vortec rebuild. The 89 4.3 have a TBI fuel injection system and the ecm on the 98 will not work and the bad news is that the ecm on the 98 also controls the transmission shift points and the 89 will not, so even if you swap the ecm to have the 89 4.3 engine work. the transmission will not shift.
Sorry for the bad news but it would be cheaper to replace the 98 engine with the years of 1996 to 2001. Good luck and hope this helps.
http://www.a1electric.com/s10motor.htm. This link has pictures and step-by-step instructions. I found it and have both sides to replace. Hope this helps.
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