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Message: <blockquote data-quote="Hemikiller" data-source="post: 410456" data-attributes="member: 25">OK, so the temperature doesn't change when you move the lever?For warm air, coolant has to flow through the heater core. There is a flow control valve on the heater hose that closes when the mode selector is placed into the AC position. Those can get corroded with age and stick closed, that would prevent you from having hot air. Your heater core could be disconnected, or plugged as well. For cold air, the AC unit has to engage the compressor. The mode selector triggers a microswitch that turns the compressor on, after it passes through the deicing switch. You can check for voltage at the compressor clutch. If it's present, then something is up with the clutch. If not, then you need to diagnose from the clutch back to the mode control. Link to wiring diagrams below. [URL unfurl="true"]https://wiki.7173mustangs.com/[/URL]</blockquote>

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