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Rear blower motor won't shut off, runs all the time on high when ventilation system is on

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  • Anonymous Mar 13, 2014

    x5 blower motor won;t shut off



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Check rear blower control switch for operation and for fault. You may need a multimeter to check electrical outputs.

Posted on Nov 04, 2012


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The relay for the manual blower system is a different relay from the others. It has terminal 87 which is the high amp terminal. It comes through fuse 3 on the relay center, a 30 amp fuse. It it is right hand underhood.

The relay also contacts terminal 87A which is the lower power circuit that gets 25 amp from fuse 5D in the instrument panel fuse block. That supplies the 3 lower speeds and when switched to high applies voltage to the relay switching it from the 25 amp circuit to the 30 amp circuit.

The SAME wiring supplies the blower from the relay on to the blower. The blower uses only one ground which is terminal B on the blower motor. Your motor should have run the same but when you disconnected the terminal socket for both A and B from the blower motor, there was no ground. You do have to supply your own ground!

Easy check is fuse 3 in the relay center. Hope it's blown. Might question why it blew, but that's an easy replacement. I might indicate impending blower motor failure with age and high current loads.

it could indicate the relay is stuck on the 87A contact and not switching under power to the other terminal. Could be primary circuit blown not pulling the relay or could be the contacts are physically burned to the most-used contact.

Jun 06, 2011 | Chevrolet Corvette Cars & Trucks

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Blower stays on when car is turned off won't stop running until I disconnect the battery cable, tried the blower fuse that didn't work. 1995 olds auroa

If you pulled the 10 amp fuse in the I/P fuse block and the blower still worked than the the blower motor module is most likely the problem. It is fed by a 30 amp fus4e in the fuse block under the rear seat. That fuse is always hot and always supply power to the blower motor module. If you pull that fuse and the blower stops than it's pretty likely the blower module is the problem.

The blower module is located near the blower motor. It is usually held in place with 2 screws and will have four or five wires at the connector.

May 10, 2011 | Oldsmobile Aurora Cars & Trucks

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