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On my 2004 Seville SLS there is cold air blowing out heat vents at idle.Engine is at normal operating temp. Drive down the street and and it is ok. Coolant seems to be full. Any ideas?
Heater Core I'm guessing. I had a sebring coupe that would do that. Made it hard to defrost my windows. I got my coolant flushed and it took care of it for a while. Problem came back though.
Your problem could be something completely different. These sevilles are their own breed.
Check the water pump belt tensioner. Then check the purge line.
Thanks. Gotta start somewhere.
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