Question about Mazda B2300

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If I start my truck and turn the A/C on it works, but once I start driving it goes to hot air.

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I see two possibilities to check first.

Check if your belt is loose. Usually there should be around 1/2 inch of give or play on the longest area of belt between two pulleys. If the belt is loose, then when you accelerate, the belt slips past the AC pulley, and can not turn the compressor.

Next, it is possible that the blend door, which allows heat from the heater core into the mix of cold/warm air is not working right. It could be stuck open so that you have warm air mixing in with the cold air. As the engine gets warm, that heat transfers in through the blend door.

If you start your vehicle, and let it sit for 15-20 mins, will the cold air go to hot air also? If so, then this could be the problem.

Let me know how you progress!

Brian

Posted on Jul 14, 2008

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