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 - Preventing Tractor Theft - by Staff. The discussion started with the following message: I have a JD A without key start or any locking device. Is there a best way to secure it so the chances of it being stolen are reduced? Following are some of the answers that were received: Take the rotor out of the distributor and hide after each use. The would-be thieves at least couldn't just get on and drive away.
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