Could be the belt needs adjusting. While, hopefully, answer 1 is correct, it is also possible that a bearing or other component INSIDE the compressor is worn, and beginning to "gall." Also, that first answer is assuming that the squeaking sound is coming from the compressor, belt, or pulleys. It is also possible that the bushings [bearings] in the BLOWER motor are galling.j3h.
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The crankshaft sensor on the 1998 NISSAN ALTIMA is located next to the radiator side of the harmonic balancer
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hammer
Motor
1
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1998 Nissan Altima GXE has a timing chain. Check your model at: http://www.courtesyparts.com/watches-c-7738.html
Mine is at 260000
15.9