1990 Honda Accord Blower Stays High

1990 HONDA ACCORD
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LUDEDUDE
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1990 Honda Accord, 170 K miles. The blower motor stays on a higher speed and the switch won't turn the blower motor down or off. I can turn it up another notch but that's about all she wrote. Possibly the switch itself? Is there some type of relay box that controls the blower motor switch?
Any help with this problem is appreciated.
Dec 11, 2006 at 1:00 AM
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BRUCE HUNT
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Should be the switch you are looking for.
Dec 11, 2006 at 2:05 AM
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LUDEDUDE
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I replaced the fan motor switch in the heater control panel and the blower motor still stays on a high speed. I can disconnect the wiring plug from the fan speed switch and the blower motor still runs at high speed. Anything I'm missing here? What else would keep the blower motor running? Any hidden modules? My Chilton doesn't cover troubleshooting for the heater.

Thanks,ludedude
Dec 26, 2006 at 1:52 AM
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BRUCE HUNT
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  • 3,754 POSTS
There is a relay under the hood in the fuse box. Check that and possibly swap with another that is the same.
Dec 28, 2006 at 6:39 AM
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LUDEDUDE
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Bruce, I changed the 30 amp relay in the fuse box under the hood from a 91 Accord I'm fixing up for my nephew. That did the trick. I have some spare relays for my lude but the contacts are a little longer than the Accords. I than put the faulty relay from the 90 into the 91 fuse box and both heater fan switches are working correctly. I'll get a few new relays as spares just in case.
Thanks again for your help.

over and out,
ludedude
Dec 30, 2006 at 8:38 AM
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Suggested Repair

Replace the blower motor relay in the under-hood fuse box. A stuck relay kept the blower on high even with the speed switch disconnected; swapping the 30-amp relay fixed it.

Conversation Summary

A 1990 Honda Accord blower stayed on a high speed and would not turn down or off. Replacing the heater control panel switch did not help, and the motor still ran with the switch unplugged. The expert pointed to a relay in the under-hood fuse box. Swapping that 30-amp relay with one from another Accord stopped the constant high-speed operation.

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