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What would cause a heater to blow warm air all the time regardless of whether the blend dial is set at hot or cold and the AC to blow hot air when blending with outside air?

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Wiki User
2010-11-19 11:46:52
2010-11-19 11:46:52

you have an ambient air temperature sensor normally located just under the front of the bumper in front of either your left or right foot well. if you've ever knocked or scraped the front bumper(even some shredded tyre on the motorway flicking up) from the underneath, this can break this temperature sensor and make your electrical management unit believe that its either extremely hot or extremely cold outside and it will blow out the opposite temperature regardless of what you choose.. you can buy replacements for around £20-50 replace yourself. hope this helps

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