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: How to Crank Start a Tractor - by Staff. This interestin discussion is from the Tractor Talk Discussion Forum. Remember that safety is your first priority - make sure you know what you are doing before attempting a potentially dangerous activity!
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