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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > No Heat passenger side PLEASE READ...



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      02-01-2013, 01:59 AM   #45
335i101
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Quote:
Originally Posted by polaris_tr
Quote:
Originally Posted by 335i101 View Post
Ok, I just want to say that I have researched this topic extensively but I still have some questions.

Vehicle: 2007 335i Coupe 08/06 build date has Dual climate and Auto.

Problem: Regardless of heat setting the passenger side blows cool air. Defrost, vent and footwell. (It is distributing the air properly, but always cool) so, I have eliminated FSR.

Driver footwell extremely hot (I can manually make adjustments so thus isn't huge but maybe a clue)

Antifreeze/coolant down a little of the past 4 months, no visible leaks. I also performed the electric water pump bleed procedure and was able to get some air out of the lines.


HEATER CONTROL VALVE/WATER VALVE: this has been frustrating as at first glance I thought that would've the problem. However, I can't find this piece under the hood (or online as a part to purchase). I have taken off intake and there is a piece with three hoses going to it but not a "electric harness.". It had a part number and that came back to A/C condenser. I am starting to think that this piece is electronic now or is on the other side of the firewall. Since I can't find it I have not been able to test if this is the problem.

Thermostat: I have read that these cars have electronic thermostat, which I can't find for the life of me!?!? Also,if it was thermostat wouldn't I always get heat on the passenger side??

Heater Core: No smell of anti-freeze, no wetness in passenger footwell, or misty windows.

So here are my "uneducated guesses"...
1) Heater core is half bad and not distributing het to passenger side (maybe that is why my feet get crazy hot as well)??

2) Heater control valve is bad, but hidden or else I am blind??

3) Flaps / actuator not working properly? Like I said if I push the air goes to vent etc...but maybe there is a damper or flap that sends hot air over to the passenger side?!?

I kind of doubt thermostat as it is only blowing cool air.

Heater Core: can it go half bad? Or half clogged??


Before I get 10 responses about knurl knob, YES it is at red and YES I have turned off the "snowflake"


Thanks for the help. I will include a pic or two of the closest thing I can find to a heater control valve/ water valve.

https://mail.google.com/mail/s/?view...1&disp=attd&zw
@335i101

You wrote this about 3 years ago I see but I have some problem like your's.My is 2006 E90 3.20i and passanger side is not heat.Driver side is very hot.Did you fix the problem?If you fixed may you tell me how?
Thank you very much...
I found out it was clogged heater core (through process of elimination).

I traded in the car.

FYI, there is another member on hear who wrote a DIY guide to replacing the core....was more than I could handle (both time wise and skills).

I wrote this 3 years ago and the thread was pretty much dead til about 3weeks ago...I have gotten several PM and posts regarding owners having the same problems. Good luck!

(From what I remember the dealership wanted 2500 or so...anyone under warranty if you think u r having problems, get it replaced now, b4 it's too late.
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      03-28-2013, 08:50 AM   #46
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I have just had the heater replaced in my E90 for the equivalent of $1000 by an indie. I do not wish that to anybody.

The service mentioned included:
- Replacing all the heater box (not only the heater core). All the heater box was literally flooded by cooland leaking from the core. Several air blend doors were stuck and not moving properly, rendering the air conditioning useless and erratic. When I saw the car interior and dashboard virtually butchered to pieces I wept silently. It was like heart surgery on an infant to me.

There are 3 types of heater box available for E90 so I was still quite happy they found the right used one at a reasonable price ($300)

- The leaking coolant was dripping down the air duct to back right passenger well, so all the upholstery was removed to get rid of roughly 5 litres (sic!) of coolant accumulated on the car floor under the upholstery within the period of 3 months. Luckily the sub-woofers under the seats were intact.

- The upholstery on the car floor was all removed, dried for two weeks and washed by Karcher cleaner to get rid of the moisture and coolant smell.

- They luckily managed to put it all together quite nicely tight so I'm very happy with the service. The air conditioning works flawlessly now.


The bottom line is this is probably the nastiest thing that can happen to your E90, and it's quite impossible to repair on your own (though there is one person in the thread that did it, i did not dare.

Check this before you buy the car. Check the foot wells of both driver and passenger for any moisture, check if there is no liquid oozing from the vents and try to rev up the engine to make sure the smell is not appearing and the windscreen is not fogging from the inside.

Thanks for this thread and cheers to all of you.
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      05-05-2014, 11:56 PM   #47
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Quote:
Originally Posted by polaris_tr
Quote:
Originally Posted by 335i101 View Post
Ok, I just want to say that I have researched this topic extensively but I still have some questions.

Vehicle: 2007 335i Coupe 08/06 build date has Dual climate and Auto.

Problem: Regardless of heat setting the passenger side blows cool air. Defrost, vent and footwell. (It is distributing the air properly, but always cool) so, I have eliminated FSR.

Driver footwell extremely hot (I can manually make adjustments so thus isn't huge but maybe a clue)

Antifreeze/coolant down a little of the past 4 months, no visible leaks. I also performed the electric water pump bleed procedure and was able to get some air out of the lines.


HEATER CONTROL VALVE/WATER VALVE: this has been frustrating as at first glance I thought that would've the problem. However, I can't find this piece under the hood (or online as a part to purchase). I have taken off intake and there is a piece with three hoses going to it but not a "electric harness.". It had a part number and that came back to A/C condenser. I am starting to think that this piece is electronic now or is on the other side of the firewall. Since I can't find it I have not been able to test if this is the problem.

Thermostat: I have read that these cars have electronic thermostat, which I can't find for the life of me!?!? Also,if it was thermostat wouldn't I always get heat on the passenger side??

Heater Core: No smell of anti-freeze, no wetness in passenger footwell, or misty windows.

So here are my "uneducated guesses"...
1) Heater core is half bad and not distributing het to passenger side (maybe that is why my feet get crazy hot as well)??

2) Heater control valve is bad, but hidden or else I am blind??

3) Flaps / actuator not working properly? Like I said if I push the air goes to vent etc...but maybe there is a damper or flap that sends hot air over to the passenger side?!?

I kind of doubt thermostat as it is only blowing cool air.

Heater Core: can it go half bad? Or half clogged??


Before I get 10 responses about knurl knob, YES it is at red and YES I have turned off the "snowflake"


Thanks for the help. I will include a pic or two of the closest thing I can find to a heater control valve/ water valve.

https://mail.google.com/mail/s/?view...1&disp=attd&zw
@335i101

You wrote this about 3 years ago I see but I have some problem like your's.My is 2006 E90 3.20i and passanger side is not heat.Driver side is very hot.Did you fix the problem?If you fixed may you tell me how?
Thank you very much...
Sorry haven't been in the forum in 2 yrs.

Yes, I solved the problem....I sold the car .

I do miss it though....
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      11-02-2014, 03:54 PM   #48
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Quote:
Originally Posted by 335i101
Quote:
Originally Posted by polaris_tr
Quote:
Originally Posted by 335i101 View Post
Ok, I just want to say that I have researched this topic extensively but I still have some questions.

Vehicle: 2007 335i Coupe 08/06 build date has Dual climate and Auto.

Problem: Regardless of heat setting the passenger side blows cool air. Defrost, vent and footwell. (It is distributing the air properly, but always cool) so, I have eliminated FSR.

Driver footwell extremely hot (I can manually make adjustments so thus isn't huge but maybe a clue)

Antifreeze/coolant down a little of the past 4 months, no visible leaks. I also performed the electric water pump bleed procedure and was able to get some air out of the lines.


HEATER CONTROL VALVE/WATER VALVE: this has been frustrating as at first glance I thought that would've the problem. However, I can't find this piece under the hood (or online as a part to purchase). I have taken off intake and there is a piece with three hoses going to it but not a "electric harness.". It had a part number and that came back to A/C condenser. I am starting to think that this piece is electronic now or is on the other side of the firewall. Since I can't find it I have not been able to test if this is the problem.

Thermostat: I have read that these cars have electronic thermostat, which I can't find for the life of me!?!? Also,if it was thermostat wouldn't I always get heat on the passenger side??

Heater Core: No smell of anti-freeze, no wetness in passenger footwell, or misty windows.

So here are my "uneducated guesses"...
1) Heater core is half bad and not distributing het to passenger side (maybe that is why my feet get crazy hot as well)??

2) Heater control valve is bad, but hidden or else I am blind??

3) Flaps / actuator not working properly? Like I said if I push the air goes to vent etc...but maybe there is a damper or flap that sends hot air over to the passenger side?!?

I kind of doubt thermostat as it is only blowing cool air.

Heater Core: can it go half bad? Or half clogged??


Before I get 10 responses about knurl knob, YES it is at red and YES I have turned off the "snowflake"


Thanks for the help. I will include a pic or two of the closest thing I can find to a heater control valve/ water valve.

https://mail.google.com/mail/s/?view...1&disp=attd&zw
@335i101

You wrote this about 3 years ago I see but I have some problem like your's.My is 2006 E90 3.20i and passanger side is not heat.Driver side is very hot.Did you fix the problem?If you fixed may you tell me how?
Thank you very much...
Sorry haven't been in the forum in 2 yrs.

Yes, I solved the problem....I sold the car .

I do miss it though....
Is it safe to drive the car with the defective heater core? Or will it harm other parts of the engine?
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      11-02-2014, 06:42 PM   #49
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Quote:
Originally Posted by GMe90 View Post
Is it safe to drive the car with the defective heater core? Or will it harm other parts of the engine?
Assuming that the leak is small, it won't hurt unless enough leaks to require more coolant (which will eventually happen). The passenger compartment will be flooded before that happens, though.
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      01-10-2015, 08:36 AM   #50
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I'm very interested in this, I'm taking my car(2010 328i) in next week for a new heater core. It's under CPO warrant, which is great, but I still don't fancy having them completely dismantle the dash and interior. What I don't understand is that I purchased the car with 13,000 miles on it, now I have 28,000. I have flushed the cooling system this year with a 50/50 mix of BMW coolant and distilled water. Prior to that, the cooling system had never been serviced, so whatever it is being filled with from the factory is whats causing the heater core blockage.
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      02-13-2015, 12:15 AM   #51
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My 2010 e92 335 has 30,000 miles and is on its third heater core. The original and replacement both clogged after about 15k miles. I hate this piece of shit. Both times, it was replaced under warranty despite the second time technically being out of warranty. A call to BMWNA cleared that up.

Now I'm dealing with a nice rattle in my dash on bumpy roads and it's making me hate my car. Our jester cores are pieces of shit and the labor to replace them is insane bc it's insanely hard to get to.

Fuck BMW
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