I have a 1987 s10 4wheel drive 2.8 eng blazer.My heater blower doesnt work the ac doesnt work either.The fuses are good in the fuse panel.Cranked up and running there is no power to the heater motor with blower switch on or no power to the ac compressop wire when the ac is on. Where do I look now? Also ther is no power to the connection on the fire wall where the red wires connect.The red wire from the heater motor connects at this point.Two other red wires come of this connection and go into the harness.Am I missing a fuse somewhere else ? thanks for any help.I just got this blazer and am trying to check it out.This is not all of its problem but the other question is rpm related.