Lots of things could cause a no-heat condition. Does any heat come out at all, or is the air cold no matter what speed the fan is at? Is your engine coolant at the proper level? Your thermostat may be stuck open, which prevents the engine from reaching proper temperature. It could be a duovalve problem, a collapsed hose, a cabin air temp sensor, etc etc. It would be a good move to see if there are any fault codes stored.

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