Heayer doesn't work
The resistors provide resistance in the circuit, dropping voltage to
the blower motor to slow the motor speed down. On high, the blower
receives full voltage through the blower relay.
If you had High but no
other speeds, then the resistor pack is usually the culprit. If you have all other speeds but high, the most common problem is going
to be the blower motor itself, relay, or the switch panel.
check this by turning the fan speed to "high", unplug the blower motor,
and check to see that you have roughly at least 12v at the plug. If you
have 12v, that means the switch panel is activating the relay and the
relay is working. Over time, heat kills the magnetic properties of the
magnets inside an electrical motor. Without enough magnetic energy, you
may not get enough opposing force to spin the rotor full speed when the
windings energize, but still enough to spin at lower speeds.
Another thing you can check is the connector at the blower motor and
the switch panel. Sometimes these will heat up, start to deform, and
cause a bad connection. The bad connection may be able to handle the
lower current draw on low speeds, but the higher resistance from the
bad connection won't be able to handle the higher current while in the
full speed position.
Hope this helps, keep me posted. be glad to help you get your heater working again soon.
Jan 07, 2010 |
1995 Chevrolet Tahoe