BMW 335xi ** NO HEAT IN THE CABIN **

f30fan123 · 01-12-2021, 08:46 AM

I have a 2014 BMW 335xi that is producing NO HEAT in the cabin at all. I've searched the forums for solutions to this issue and the only answer I found was to replace the thermostat. So I did. Unfortunately I still have no heat inside of the car. Even after bleeding the system multiple times.

Another issue I am having that might be related to my heat issue is the amount of air being pushed through the vents. When I have the fans turned all the way up I can hear the blower motor pushing air through but it feels like there is not a lot of air coming through the actual vents. I have checked the blower motor and there is no debris in the housing. The motor seems to be working just fine.

The only ideas I have at this moment are that the heater blend actuator is not working properly and that is causing low air pressure and as a result, no heat to the inside. Another possibility is that my heater core is clogged but strangely enough, if I leave my fans turned off and the car is up to temperature, I can turn the fans on low and for a few seconds I can feel heat through the vents.

Has anyone else had this issue before on their F30??? I am looking for any ideas/help I can get at this point being that its getting nice and cold up here in Ohio and I now have to wear a winter hat, gloves, and jacket just so I don't freeze on the way to work.

thejeremyman9 · 01-12-2021, 10:46 AM

Its probably the blend door actuators in the dash as you mentioned, especially if you have decreased airflow. This really isnt the best section for this question, i have seen several similar threads in the TSB section, so i would check there:

https://f30.bimmerpost.com/forums/fo...play.php?f=437

f30fan123 · 01-12-2021, 11:20 AM

Thanks for the redirection, I will navigate through that section and try to gather some more information.

Bimmertech80 · 01-20-2021, 10:43 AM

The heater cores get clogged with sand. You can try flushing it but it never works

435gc · 01-20-2021, 02:43 PM

Quote:

Originally Posted by Bimmertech80

The heater cores get clogged with sand. You can try flushing it but it never works

Lol. Try this solution. It won't work.

01-12-2021, 08:46 AM	#1
f30fan123 New Member 0 Rep 7 Posts Drives: Bmw 335xi Join Date: Jan 2021 Location: Ohio iTrader: (0)	BMW 335xi NO HEAT IN THE CABIN I have a 2014 BMW 335xi that is producing NO HEAT in the cabin at all. I've searched the forums for solutions to this issue and the only answer I found was to replace the thermostat. So I did. Unfortunately I still have no heat inside of the car. Even after bleeding the system multiple times. Another issue I am having that might be related to my heat issue is the amount of air being pushed through the vents. When I have the fans turned all the way up I can hear the blower motor pushing air through but it feels like there is not a lot of air coming through the actual vents. I have checked the blower motor and there is no debris in the housing. The motor seems to be working just fine. The only ideas I have at this moment are that the heater blend actuator is not working properly and that is causing low air pressure and as a result, no heat to the inside. Another possibility is that my heater core is clogged but strangely enough, if I leave my fans turned off and the car is up to temperature, I can turn the fans on low and for a few seconds I can feel heat through the vents. Has anyone else had this issue before on their F30??? I am looking for any ideas/help I can get at this point being that its getting nice and cold up here in Ohio and I now have to wear a winter hat, gloves, and jacket just so I don't freeze on the way to work.
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01-12-2021, 10:46 AM	#2
thejeremyman9 Major General 4368 Rep 7,620 Posts Drives: 2015 BMW 335i Join Date: May 2019 Location: Cali iTrader: (0)	Its probably the blend door actuators in the dash as you mentioned, especially if you have decreased airflow. This really isnt the best section for this question, i have seen several similar threads in the TSB section, so i would check there: https://f30.bimmerpost.com/forums/fo...play.php?f=437
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01-12-2021, 11:20 AM	#3
f30fan123 New Member 0 Rep 7 Posts Drives: Bmw 335xi Join Date: Jan 2021 Location: Ohio iTrader: (0)	Thanks for the redirection, I will navigate through that section and try to gather some more information.
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01-20-2021, 10:43 AM	#4
Bimmertech80 New Member 11 Rep 12 Posts Drives: BMW 435i xdrive coupe Join Date: Mar 2020 Location: Atlanta, Georgia iTrader: (0) Garage List 2015 BMW 435i xdrive [0.00]	The heater cores get clogged with sand. You can try flushing it but it never works
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