My 1987 5.7 TPI Iroc has some issues. First off, my voltmeter reads low at times, ex. when fans come on, head lights are on, and the voltmeter stays low until they are shut off. Also I checked to see if both fans work and it appears that the pass. fan doesn't work. When the fans kick on to cool the engine (I have 160' themostat, fan switch, themomaster chip) only the driver side fan should come on right? Then if you turn on the a/c the pass. side should come on to, right? I turned on my a/c and the pass. did not come on at all. Should I replace the fan motor?

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1999 Camaro SS LS1 m6 12.6@112mphw/1.9 60ft
1987 Iroc-Z 5.7 TPI best et. 14.3@94mph w/2.0 60ft.
1984 Camaro