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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E46 (1999 - 2006)

E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 01-25-2013, 11:04 PM
BMW318i_E36 BMW318i_E36 is offline
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Location: Oakville, Ontario
 
Join Date: Mar 2006
Posts: 1,015
Mein Auto: 2006 BMW 330XI, 11 X5 35d
Heating problems !

Have a 2003 BMW 325i with Automatic Gearbox.
I have a problem, first of all, heat doesn't come on until the temperature guage is at the middle, otherwise cold air. When the car is warmed up, still not getting that much heat, it does get warm, but not hot, no matter what the temperature, either at 20 degrees centigrade or 32 degrees centigrade, the highest, it does not get warmer. Also, noticed no eat coming down to the floor. I had the thermostat replaced about a month ago, because I got the engine.
Can anyone please help me with this issue ?
Thanks
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  #2  
Old 01-25-2013, 11:37 PM
scarede46er scarede46er is offline
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Mein Auto: 2001 BMW 325i ZSP
What brand of thermostat did u put in it? Plus did you bleed the system properly? What is the coolant level?
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  #3  
Old 01-25-2013, 11:49 PM
xin668 xin668 is offline
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Mein Auto: 745li
Since you replaced the thermostat, I am assuming that you car has sufficient amount of coolant. Otherwise you would have noticed it. There are a couple areas that I would check. One is the valve actuator that controls the amount of warm/hot coolant to pass through the heater core in the car. The other one is the coolant pump. I heard from a friend that some year's BMWs' coolant pump impeller was made of plastic! That sounds crazy, and it is a potential failing point that the impeller just seperated from the coolant pump over time, and coolant can't circulate through the heater core! Hope it is not the latter that you are dealing!
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Old 01-26-2013, 12:44 AM
BMW318i_E36 BMW318i_E36 is offline
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Location: Oakville, Ontario
 
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Mein Auto: 2006 BMW 330XI, 11 X5 35d
I don't know which brand, all I know is, it was replaced, and no engine light after that !
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  #5  
Old 01-26-2013, 09:44 PM
GoForthFast GoForthFast is offline
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Location: New York
 
Join Date: Jul 2004
Posts: 2,362
Mein Auto: '04 330Ci 6-speed
Pump is not the problem. If it failed, your engine would overheat quickly.
And composite vaned pumps last a good long time. Bad ones are long gone from early cars.
You probably need to bleed the air out of the system. usually needs it more than a couple of times after refilling the coolant.
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