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Message: <blockquote data-quote="ORVietVet" data-source="post: 20731" data-attributes="member: 9438">Back to the 2007 Mazda 3. I was still not completely satisfied with the heat output at idle. I did pull the heater core hoses off and the heater core was not clogged up at all. Then I noticed that when it sat idling, I could see little air bubbles come back to the reservoir. I put an rpm prop on it, after filling the reservoir, and watched. The air bubbles would appear every so often and level would drop. I then shut off and filled up. I then ran at a higher speed and saw just a few more air bubbles and all of a sudden the heat at idle was way better. I got it fixed and the air out of the system.</blockquote>