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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 03-07-2014, 08:21 AM
TeeBear TeeBear is offline
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Location: Houston, TX
 
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Mein Auto: 2003 BMW 325I
325I Running Hot, replaced

Hi, I have a 2003 325I with 158k miles and it's running hot. I've replaced the thermostat and thermostat housing, the radiator hoses, the expansion tank, and the expansion tank hose. I had the radiator and fan replaced last year. The water pump was pressurized and appears to be ok. Does anyone have any suggestions on what the problem could be?
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  #2  
Old 03-07-2014, 09:18 AM
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hexy27 hexy27 is offline
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Mein Auto: 2002 330i
Did you properly bleed the system to get all the air out? Procedure is in the WIKI

One thread per topic is sufficient........
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  #3  
Old 03-07-2014, 09:26 AM
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ahull ahull is offline
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Mein Auto: ist schnell! (03 330i SC)
Auto or manual?
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2003 330i TiAg Sport Pkg ~90k miles
DIY MODS: AA Stage I supercharger, Meyle HD FCAs w Powerflex CABs, Bilstein shocks, Meyle HD Rtabs, Angel Eyes, Clear Corners/Markers w/ LEDs, LED tails, ZHP rims, Akebono pads, AUX input
DIY E46 Merit Badges: Sunroof resurrection, CCV, OFHG, VCG w/ VANOS seals, DISA, Cooling Refresh I, steering giubo, window regs, Magnetic Infandibulator (see wiki)
DIY On deck: Rear Diff bushing. UUC SSK, clutch job eventually, Wavetrac LSD
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  #4  
Old 03-07-2014, 12:16 PM
TeeBear TeeBear is offline
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Location: Houston, TX
 
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Mein Auto: 2003 BMW 325I
Quote:
Originally Posted by hexy27 View Post
Did you properly bleed the system to get all the air out? Procedure is in the WIKI

One thread per topic is sufficient........
The system has been properly bled. My car is at an auto shop now but they can't seem to find out what the problem is.

(The second thread was an accident. I'm new to this)
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  #5  
Old 03-07-2014, 12:17 PM
TeeBear TeeBear is offline
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Location: Houston, TX
 
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Mein Auto: 2003 BMW 325I
Quote:
Originally Posted by ahull View Post
Auto or manual?
Auto
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  #6  
Old 03-07-2014, 12:24 PM
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ahull ahull is offline
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Mein Auto: ist schnell! (03 330i SC)
Does it run hot while driving or when idling? Sorry meant to ask in the same post. And which fan was replaced? Your car has two - one one the pump and an elec in front of rad
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2003 330i TiAg Sport Pkg ~90k miles
DIY MODS: AA Stage I supercharger, Meyle HD FCAs w Powerflex CABs, Bilstein shocks, Meyle HD Rtabs, Angel Eyes, Clear Corners/Markers w/ LEDs, LED tails, ZHP rims, Akebono pads, AUX input
DIY E46 Merit Badges: Sunroof resurrection, CCV, OFHG, VCG w/ VANOS seals, DISA, Cooling Refresh I, steering giubo, window regs, Magnetic Infandibulator (see wiki)
DIY On deck: Rear Diff bushing. UUC SSK, clutch job eventually, Wavetrac LSD

Last edited by ahull; 03-07-2014 at 12:26 PM.
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  #7  
Old 03-07-2014, 12:48 PM
TeeBear TeeBear is offline
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Location: Houston, TX
 
Join Date: Mar 2014
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Mein Auto: 2003 BMW 325I
Quote:
Originally Posted by ahull View Post
Does it run hot while driving or when idling? Sorry meant to ask in the same post. And which fan was replaced? Your car has two - one one the pump and an elec in front of rad
It starts to run hot after driving about 40 miles. The fan in front of the radiator has been replaced. It's at an auto shop now but they can't seem to find out what the problem is.
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  #8  
Old 03-07-2014, 01:24 PM
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ahull ahull is offline
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Location: Carolina
 
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Mein Auto: ist schnell! (03 330i SC)
Quote:
Originally Posted by TeeBear View Post
It starts to run hot after driving about 40 miles. The fan in front of the radiator has been replaced. It's at an auto shop now but they can't seem to find out what the problem is.
Get them to check the strength of the pump mounted fan clutch. Supposedly a weak one can be stopped by hand, although I'd wear a glove or use a piece of rubber hose to gently drag on the blades to see. I think it's an oil filled clutch so maybe once it warms up it gets weak when the oil thins.
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2003 330i TiAg Sport Pkg ~90k miles
DIY MODS: AA Stage I supercharger, Meyle HD FCAs w Powerflex CABs, Bilstein shocks, Meyle HD Rtabs, Angel Eyes, Clear Corners/Markers w/ LEDs, LED tails, ZHP rims, Akebono pads, AUX input
DIY E46 Merit Badges: Sunroof resurrection, CCV, OFHG, VCG w/ VANOS seals, DISA, Cooling Refresh I, steering giubo, window regs, Magnetic Infandibulator (see wiki)
DIY On deck: Rear Diff bushing. UUC SSK, clutch job eventually, Wavetrac LSD
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  #9  
Old 03-07-2014, 01:33 PM
TeeBear TeeBear is offline
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Location: Houston, TX
 
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Mein Auto: 2003 BMW 325I
Quote:
Originally Posted by ahull View Post
Get them to check the strength of the pump mounted fan clutch. Supposedly a weak one can be stopped by hand, although I'd wear a glove or use a piece of rubber hose to gently drag on the blades to see. I think it's an oil filled clutch so maybe once it warms up it gets weak when the oil thins.
I'll tell them to check. I'll keep you posted. Thanks.
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  #10  
Old 03-07-2014, 01:36 PM
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crowz crowz is offline
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Mein Auto: 2000 323i, 97 528i
Might be a bad fan clutch (the mechanical one). Usually they run cool at high speeds and overheat below a certain speed. I believe mine got hot under 45mph and at idle for sure.

Its a cheap item to fix. Bought mine at autozone I think for $50 or something.
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  #11  
Old 03-07-2014, 01:37 PM
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crowz crowz is offline
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Quote:
Originally Posted by ahull View Post
Get them to check the strength of the pump mounted fan clutch. Supposedly a weak one can be stopped by hand, although I'd wear a glove or use a piece of rubber hose to gently drag on the blades to see. I think it's an oil filled clutch so maybe once it warms up it gets weak when the oil thins.
I mentioned the drag against the fan blades before and everyone went ballistic so I just mention replacing it now

Its how I diagnosed mine when it went bad.
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  #12  
Old 03-07-2014, 01:57 PM
TeeBear TeeBear is offline
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Location: Houston, TX
 
Join Date: Mar 2014
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Mein Auto: 2003 BMW 325I
Quote:
Originally Posted by crowz View Post
I mentioned the drag against the fan blades before and everyone went ballistic so I just mention replacing it now

Its how I diagnosed mine when it went bad.
Ok, thanks
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  #13  
Old 03-07-2014, 10:36 PM
samster1 samster1 is offline
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Location: canada
 
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Mein Auto: 2002 bmw 320i
If you didn't mention the fact that the thermostat had been changed I would of probably told you to change that, cause your getting a symptom of a thermostst that is not opening completly, did you notice that if you put the heat on in the car if the temp gauge would come down a little......I always say begin with the simple thing s first, check the strength of the coolant, cause to watered down I've seen on occasion cause a car to run a little hotter cause water has a lower boiling point then actual coolant, check that you have the right level of coolant cause not enough coolant can cause the car to run a little hotter, cold the little rod in the expansion tank should be right up the air, and hot should be just about flush with the rim of the tank......keep us up to date...hope it helped.....
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