My 91 300 E 4matic blower quit. It had been making some squeal noise in the past weeks. I replaced the blower. Still not work. The fuses are OK, both the 8amp and 25 amp inline. Tested the aux coolant pump and had .81 amps and then went to 1.0 amps when warmed up. My book says replace the aux over .8 amps. I shot some WD40 in the aux motor bearings and amps dropped to .5. Still no blower on any setting. I have 14+ volts to the blower(red wire) and -.22 volts (blue wire). If I take the blue terminal to ground the blower runs. Should I replace the aux pump or is there something that I am missing and should check out first. Thanks for any and all shared knowledge.

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Handyjay