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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 07-02-2012, 11:19 PM
Dayton_e46 Dayton_e46 is offline
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318i E46 1998 major overheating issue

Hi I have a major overheating problem with my e46 318i 1998 (m43).

After 10mins of driving will overheat.

- I've bleed the system as per recommendations. No fix..
- I've replaced the thermostat as my lower radiator hose was cold and top hose was hot. No fix..
- I've replaced radiator cap. No fix..
- I've also had the radiator removed and cleaned, mechanic found a slight blockage of about 15%, clean radiator has now been re-installed but still overheating....

- No signs of head gasket issues as there is no water in oil..

Any suggestions?? Thanks everyone for your time

Last edited by Dayton_e46; 07-03-2012 at 02:30 AM.
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  #2  
Old 07-03-2012, 02:16 AM
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crowz crowz is offline
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Fan clutch bad?
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  #3  
Old 07-03-2012, 02:19 AM
Dayton_e46 Dayton_e46 is offline
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Fan seems to be working fine comes on and off
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  #4  
Old 07-03-2012, 02:33 AM
Dayton_e46 Dayton_e46 is offline
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Could it be a faulty water-pump?
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  #5  
Old 07-03-2012, 07:42 AM
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Try bleeding again, with the front end raised a bit. That`s a 4-cylinder engine, right ? Make sure you`re bleeding from the highest possible point on the engine/cooling system, and that you have the heater set to "FULL ON", with the fan blowing as well.
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  #6  
Old 07-03-2012, 09:40 AM
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Hi. Check pipe connector at the rear of the head-
http://forum.e46fanatics.com/showthr...pipe+connector
As already mentioned, water pump may be faulty.
I bled mine by putting the heaters on full then took the cap off, started the engine and kept squeezing the top hose until the fluid reached the top of the tank, then stopped and topped up coolant as required, keep checking the temp gauge. Kept doing that until no more bubbles and coolant was at the correct level. Worked for me. Jim
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  #7  
Old 07-03-2012, 03:32 PM
Dayton_e46 Dayton_e46 is offline
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Thanks guys,

I recently replaced the pipe at the back of the head as it was leaking coolant from there.

I have also jacked the car up from the front and tried bleeding it that way but there in an endless amount of air still in the system??
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  #8  
Old 07-03-2012, 06:35 PM
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Originally Posted by Dayton_e46 View Post
Thanks guys,

I recently replaced the pipe at the back of the head as it was leaking coolant from there.

I have also jacked the car up from the front and tried bleeding it that way but there in an endless amount of air still in the system??
All it takes is *one* stubborn air bubble to cause an annoying overheat condition....try tapping all cooling system components with a rubber mallet to (hopefully) dislodge any bubbles.
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  #9  
Old 07-03-2012, 06:38 PM
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smolck smolck is offline
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What about your water pump? I'd start there since nothing else seems to be working.
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  #10  
Old 07-03-2012, 07:55 PM
Dayton_e46 Dayton_e46 is offline
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Yeah I'm thinking about just pulling the water pump off and checking that because everything else has been replaced except the water pump now..

I'll also try using a rubber mallet first to see if I do have a stubborn air pocket somewhere in the system. Thanks everyone you've all been a great help
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  #11  
Old 07-04-2012, 04:44 AM
Dayton_e46 Dayton_e46 is offline
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NOW I'M STUFFED!!

I inserted a M6 screw in water-pump thread to press out water pump evenly from gear case but the housing on the water pump cracked off now i have no means of removing the water pump.
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  #12  
Old 07-05-2012, 02:55 AM
Dayton_e46 Dayton_e46 is offline
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Head was tested and is damaged

I replaced the water pump, still overheating. So I got fed up with it got the mechanic to test it and after all the head is damaged. In the process of removing the head to get it crack tested etc I've been quoted $770AUS to get a change over cylinder head that's been reconditioned. What a money pit this car has been
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  #13  
Old 09-13-2012, 04:26 PM
navish navish is offline
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Overheating

Couple of things you need to do

1 to make sure you bleed the cooling system properly.
2is thermostat working
3 water pump

now if all these are fine the you need to buy " k seal" .
It will sort your problem out as i have same on my 1999 318i
it worked fine have no problem now
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  #14  
Old 09-13-2012, 06:17 PM
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Quote:
Originally Posted by navish View Post
Couple of things you need to do

1 to make sure you bleed the cooling system properly.
2is thermostat working
3 water pump

now if all these are fine the you need to buy " k seal" .
It will sort your problem out as i have same on my 1999 318i
it worked fine have no problem now
You`re 2+ months late to the party....
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  #15  
Old 09-15-2012, 02:32 AM
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Hi. It would be nice to know the outcome from the original poster. Jim
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