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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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