front windscreen defroster blowing cold air

dirty elf · 12-16-2019, 09:06 AM

My front defroster seems to be blowing cold air. This has the opposite effect... it fogs the windscreen! Thankfully this only happens on the passenger side.

Any idea why this is happening? Is it a setting I inadvertently turned on? I have tried setting the passenger temp control to max and setting the middle dial to full red. It still blows cool air on the passenger side. I can feel quite the difference in the air temperature with just my hand.

Not sure where to start looking. Really don't want to take it to the dealer...

Billfitz · 12-16-2019, 09:57 AM

It's probably a clogged heater core. Cold air from the heater on the passenger side is a well known and often posted problem.

dirty elf · 12-16-2019, 06:59 PM

Any tips on troubleshooting or fixing?

chowser51 · 12-27-2019, 09:03 PM

Flush your heater core. Shouldn’t take too long. It should be readily apparent if that was the cause.

coffeeslugg · 01-21-2020, 06:58 PM

Quote:

Originally Posted by chowser51

Flush your heater core. Shouldn’t take too long. It should be readily apparent if that was the cause.

Anybody have a DIY on how to do this?

12-16-2019, 09:06 AM	#1
dirty elf BSME 9 Rep 114 Posts Drives: 2004 M3, 2014 320i Join Date: Feb 2011 Location: Orlando iTrader: (0) Garage List 2014 BMW 320i [0.00] 2004 BMW M3 [0.00]	front windscreen defroster blowing cold air My front defroster seems to be blowing cold air. This has the opposite effect... it fogs the windscreen! Thankfully this only happens on the passenger side. Any idea why this is happening? Is it a setting I inadvertently turned on? I have tried setting the passenger temp control to max and setting the middle dial to full red. It still blows cool air on the passenger side. I can feel quite the difference in the air temperature with just my hand. Not sure where to start looking. Really don't want to take it to the dealer... __________________ 2004 Silver-Grey ///M3 Coupe 6MT 2014 Black Sapphire Metallic 320i Sedan 8AT 2024 ????
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12-16-2019, 09:57 AM	#2
Billfitz Lieutenant General 8243 Rep 16,081 Posts Drives: '15 328iX GT Join Date: Jan 2015 Location: New Hampshire iTrader: (0)	It's probably a clogged heater core. Cold air from the heater on the passenger side is a well known and often posted problem.
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12-16-2019, 06:59 PM	#3
dirty elf BSME 9 Rep 114 Posts Drives: 2004 M3, 2014 320i Join Date: Feb 2011 Location: Orlando iTrader: (0) Garage List 2014 BMW 320i [0.00] 2004 BMW M3 [0.00]	Any tips on troubleshooting or fixing? __________________ 2004 Silver-Grey ///M3 Coupe 6MT 2014 Black Sapphire Metallic 320i Sedan 8AT 2024 ????
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12-27-2019, 09:03 PM	#4
chowser51 Colonel 2025 Rep 2,808 Posts Drives: F33 430 and F39 M35i Join Date: Feb 2009 Location: Cleveland, OH iTrader: (3) Garage List 2018 BMW 430i xDrive [0.00]	Flush your heater core. Shouldn’t take too long. It should be readily apparent if that was the cause.
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