Are you saying the air turns warm or the system is changing modes ie switching from the dash vents to floor and or defrost? If you're having mode changes, the vacuum check valve is likely failed. Its normally located in the vacuum line that goes through the firewall near the evaporator case. Make sure there are no cracks or breaks in the vacuum supply line. If it's turning warm going up hill, you may have an engine performance problem. Check the simple stuff like dirty air filter, worn spark plugs, under inflated tires, unload the extra weight, etc.
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Today's Featured Article - Talk of the Town: Best Tractor? - by Staff. This recent discussion on the Tractor Talk discussion board here at the on-line magazine drew quite a bit of response. We see the question of "Which tractor is best for me?" asked quite often. We thought you might find the responses interesting. As always, the names of the people participating in the discussion have been left out - we did not request their permission to reprint their names in this article. However you can find this discussion in it's entirety in the Tractor Talk archives.
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