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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 01-08-2010, 07:15 AM
guntersr guntersr is offline
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Heater does not heat up

Hello I have a 525i 2003 and the heat doesnt heat up until you run the temp up to about 80when I put it on 70 the air is warm but not hot....most of the time the air feel luke warm! has anyone else had this problem and what did you do to fix it....The radiator has been replaced and all hoses are good.
Thanks
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  #2  
Old 01-08-2010, 08:18 AM
KeithS KeithS is offline
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Is the temp gauge in the middle? Have you tried adjusting the temp wheel between the center dash vent to more red dots?
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  #3  
Old 01-08-2010, 01:32 PM
guntersr guntersr is offline
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Yes the temp gauge is in the middle and the red dots are on three red dots....Do you have any idea what the problem is?
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  #4  
Old 01-08-2010, 01:41 PM
Waveho Waveho is offline
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If you are not suffering from cooling system problems (clogged system limiting delivery of coolant to the heater core) then I would look to a faulty FSU (blower resistor); do a search on this forum for FSU and you might find what you are looking for.
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  #5  
Old 01-08-2010, 02:36 PM
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ashton540 ashton540 is offline
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Quote:
Originally Posted by guntersr View Post
Hello I have a 525i 2003 and the heat doesnt heat up until you run the temp up to about 80when I put it on 70 the air is warm but not hot....most of the time the air feel luke warm! has anyone else had this problem and what did you do to fix it....The radiator has been replaced and all hoses are good.
Thanks
I would consider 70 to be luke warm.. Does your air conditioning work properly?
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  #6  
Old 01-08-2010, 03:15 PM
franka franka is offline
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I too found that you have to crank the temp way past 70 and then it works pretty well.

I also noticed that I have heat in a short distance and short time period. Its warm air before the engine temp gage is 25% up assuming 50% is the straight up, fully warm position.

Wish I had seat heaters.
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  #7  
Old 01-08-2010, 04:58 PM
guntersr guntersr is offline
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No problem with AC it works great......Let me ask you if put it on air circulating in the car or drawing air from outside car makes a difference?
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  #8  
Old 01-08-2010, 06:27 PM
guntersr guntersr is offline
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Question:.....Would the coolant ( Not BMW) cause the heat not to be as hot as it should be?
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  #9  
Old 01-08-2010, 07:00 PM
occhis occhis is offline
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Quote:
Originally Posted by franka View Post
I too found that you have to crank the temp way past 70 and then it works pretty well.

I also noticed that I have heat in a short distance and short time period. Its warm air before the engine temp gage is 25% up assuming 50% is the straight up, fully warm position.

Wish I had seat heaters.
Seat heaters definitely rock.
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  #10  
Old 01-08-2010, 07:04 PM
occhis occhis is offline
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What brand did you use?
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  #11  
Old 01-08-2010, 09:18 PM
edjack edjack is offline
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guntersr,

Has it always been this way, or just since the cooling system work. OR, since the very cold weather you've been having?

It could be perception, or air in the system, due to a les-than correct system bleed. OR, it may be a failing heater valve. Is the heat the same on both sides, or different? If different, the valve may be bad.
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  #12  
Old 01-09-2010, 09:19 AM
guntersr guntersr is offline
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actually noticed it during this cold weather....I live in the Atlanta Ga area.....
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  #13  
Old 01-09-2010, 11:22 AM
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bmw_n00b13 bmw_n00b13 is offline
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Could be low coolant or a locked-open thermostat. Mine has given the open-thermostat symptom a few times...and then it goes away. (Yes, cooling system overhaul is planned, but money and the problem of no garage space get in the way).

As for seat heaters, in both my car and my grandfather's car, I find that the temperature comes up before the seats get warm. They're really nice, but the car's pumping hot air as the seats warm up.

When you put it on the defrost setting, does the air get hot? The computer that controls the heating is highly variable, and tries to make itself as unobtrusive as possible, so it seldom blows noticeably hot air, unless you ask it to.
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  #14  
Old 01-11-2010, 03:14 AM
bishoOo bishoOo is offline
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it happened to me twice:

the first time it was due ro low coolant in the car.. found a leak and made an overhaul for the engine coolant system. or you can add coolant every once and a while!

the second time it happened i changed something like a thermostat for the heater it self...

dont know whats the name of that part exactly, but its the part the opens and closes when u switch on the heater. its a heater thermostat i guess!
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  #15  
Old 01-12-2010, 05:36 PM
KTRAXO KTRAXO is offline
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I'm havin the same problem , I have noticed that when the temp gauge goes up the heat works ok and when the temp gauge stays down in the blue line it only blows warm air, and I'm pretty sure is the t'stat.
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  #16  
Old 01-18-2010, 06:55 PM
KTRAXO KTRAXO is offline
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I replaced the t'stat and water pump and problem solved, I also had the engine light on and now is off.
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  #17  
Old 01-18-2010, 07:08 PM
xraye39 xraye39 is offline
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Quote:
Originally Posted by guntersr View Post
The radiator has been replaced and all hoses are good.
Thanks
Who refilled and bled the cooling system? Ya might have an air pocket in the heater core or your thermostat could have failed and be in the stuck open mode.
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