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I have a 1981 300d with 200,000 miles. The heat works fine at times. However,if I turn it off, then turn it back on a little later, it blows cold air. I have found that if I stop and turn car off then re-start it, the air will be hot again. (the heat seems to only work on high. And only comes out of defroster and upper vents, nothing out of the lower foot vents) My commute is about an hour. If I keep the heat on the whole way (glad it has a sun roof!!), the air will turn cool after about 45-50 minutes. Any suggestions???

Thank you
 
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