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Message: <blockquote data-quote="derekastregal" data-source="post: 2432364" data-attributes="member: 353906">ok i have an old mazda mpv. still runs decent even though it burn alot of oil and has a small leak in the gas tank which im looking for a new tank as i type this. so anyway im in chgo so we have really cold winters here. my ac does not work anymore but when i turn on the heater it sometimes feels like the air flow is not as powerful as it use t be and also it will blow cold air and then as i drive it will blow warmer air but sometimes go back to just luke warm or cold air. so is this just cause its an old car or is there something i can do to fix this. can a car low on oil make t blow colder and wnen there is more oil in it will be warmer?new spark plugs? i dont know all i know is its gnna be 10 dgrees tomm and im gnna freeze my but off</blockquote>