Blower Motor - Only high
RolandMD
12-24-2010, 10:28 AM
I know I have seen it on here before, but all I can find are threads that state "no high on blower motor." Mine is the exact opposite. All I have is high speed, with no low, mid, mid-high. Thoughts?
Thanks,
Roland
Thanks,
Roland
LMP
12-25-2010, 03:38 AM
I'd think the resistor pack is shot between B and A below
www.avigex.ca/xport/hvac_diagram_front.jpg
Pull it off and verify. www.avigex.ca/xport/heaterrelay.jpg
...but you had hi speed relay connector problems before...so consider this possibility, as even the lower speeds are fed through the high speed relay in released state...
...or for some reason, though improbable, the high speed relay does not fall back fully to its release position (to allow contact to all lower speeds). ThIs could be easily tested by pulling the relay out and installing a jumper wire from 87A to 30.
www.avigex.ca/xport/hvac_diagram_front.jpg
Pull it off and verify. www.avigex.ca/xport/heaterrelay.jpg
...but you had hi speed relay connector problems before...so consider this possibility, as even the lower speeds are fed through the high speed relay in released state...
...or for some reason, though improbable, the high speed relay does not fall back fully to its release position (to allow contact to all lower speeds). ThIs could be easily tested by pulling the relay out and installing a jumper wire from 87A to 30.
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