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Anonymous
Anonymous Posted on Aug 25, 2011
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My AC/Heater works on low speed med speed but does not work on High speed what could it be? all it does when i put it on High speed is cut off please help.

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  • Posted on Aug 30, 2011
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When you move the selector over to "high"; on the inside of the control module, it's a pressure type of switch that when pressed down far enough, it is suppose to turn up fan. If the pressure type switch is worn out on the "high" side of this switch then of course it wouldn't work properly.

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  • Posted on Aug 25, 2011
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You dont mention what Engine or AUTO or MANUAL A/C . If AUTO A/C, Blower Motor Control Module is likely bad. If Manual A/C the blower motor relay is bad. The relay is near the blower motor taped to the harness.

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Check the blower motor resistor.

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Ac/heater will only work on low when you move it to med or high it shuts off
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