Question about 2010 BMW X5 xDrive

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When defrost is turned on , the whole windshield gets so fogged you can not see anything

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There may be a leak in your heater core inside of the care. This would cause moisture to be blown up onto the windshield.
Take the car to a mechanic to verify this.

Posted on Nov 15, 2014

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1 Answer

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Is the heater control in the defrost position? Most cars will automatically turn the air conditioning compressor on when defrost is selected to dehumidify the air being directed on the windshield. This keeps the windshield from fogging up, and helps defog the windshield more quickly if it is already fogged up.

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Assuming that it is working in frigid conditions, sometimes The
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May I assume you've tried the 'defrost' setting? Front or rear windshield? I'd be looking at control to turn on 'defrost'. As for the in/out, there's an inlet and outlet hose to the core.

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It is normal for the A/C compressor to come on during defrost mode. This is done to prevent provide dry air to the windshield to prevent fogging when the defroster is turned on. The blend door is designed to allow heat to the windshield, but also some of the cool air from the evaporator to prevent fogging.

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There is too much moisture inside the cabin. Either something is leaking water into the car, or your fresh air setting is not working on the hvac system. You can not run the system on recirculate and get rid of the moisture.

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1 Answer

My car smells like it is overheating but does not and the windows fog. when i put my windshield defroster on, it takes a long time to do anything and sometimes the fog gets worse.


it sounds like you have a heater core leak. If it smells sweet and the floor is wet on the passenger side, it is a leaky heater core. Costly repair.

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Was there a smell along with it fogging up the window like antifreeze? If it did the heater core is leaking and needs to be replaced. It will be kind of a sweet smell.

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