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Chevrolet Express
Platform: GMT Van

94 G20 Aux heater diverter valve stuck to rear

Old Apr 9, 2026 | 10:54 PM
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Default 94 G20 Aux heater diverter valve stuck to rear

valve is fully functional and only actuates when vacuum is applied, but theres vacuum all the time when the engine is running and it sends all the heat to the rear aux unit.

from what i can gather the vacuum is controlled from the main dash climate control unit - but its full vacuum in every position.

how to troubleshoot?
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