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No Hot Air?
I think I have some kind of vacuum leak, but would like some additional information.
I have a 2005 chevy colorado and I do have the fan resistor issue, but that isnt my problem here. My heater started blowing cold air, after turning it on and off once or twice, I hear a "thumping" kind of noise. It sounds like it is coming from behing me, almost under the bed somewhere. Any ideas? Things I can check?
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