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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 01-20-2005, 03:36 PM   #1 (permalink)
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alright so my coolant is leaking somewhere or evaporating. I fill it up every three weeks(and by fill up i mean put more in it.) and if i forget it starts to overheat. SO i took it to my mechanic..he said nothings wrong with it, he pressure tested it. HE also change the fluid. I changed the radiator car and the thermostat...I cant firgure out why the hell its doing this.
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Old 01-20-2005, 04:14 PM   #2 (permalink)
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Did you bleed the system after changing the thermostat ?
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Old 01-20-2005, 07:59 PM   #3 (permalink)
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Quote:
Originally posted by Torque@Jan 20 2005, 04:14 PM
Did you bleed the system after changing the thermostat ?
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yea why. We just emptied it as much as we could and filled it back up, no flush though.
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Old 01-21-2005, 12:44 AM   #4 (permalink)
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Quote:
Originally posted by Numark318i+Jan 20 2005, 06:59 PM--><div class='quotetop'>QUOTE(Numark318i @ Jan 20 2005, 06:59 PM)</div><div class='quotemain'><!--QuoteBegin-Torque@Jan 20 2005, 04:14 PM
Did you bleed the system after changing the thermostat ?
[snapback]275731[/snapback]
yea why. We just emptied it as much as we could and filled it back up, no flush though.
[snapback]275815[/snapback]
[/b][/quote]

just currious but what was your compression when you tested it? or do you mean presure test the radioator, you could be burning coolant, or leaking out of a gasket somwhere. other then that it shouldn't be evaportaing, unless you radiator is leaking.
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Old 01-21-2005, 12:54 AM   #5 (permalink)
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Quote:
Originally posted by Kowalski+Jan 21 2005, 12:44 AM--><div class='quotetop'>QUOTE(Kowalski @ Jan 21 2005, 12:44 AM)</div><div class='quotemain'>
Quote:
Originally posted by Numark318i@Jan 20 2005, 06:59 PM
<!--QuoteBegin-Torque
Quote:
@Jan 20 2005, 04:14 PM
Did you bleed the system after changing the thermostat ?
[snapback]275731[/snapback]

yea why. We just emptied it as much as we could and filled it back up, no flush though.
[snapback]275815[/snapback]
just currious but what was your compression when you tested it? or do you mean presure test the radioator, you could be burning coolant, or leaking out of a gasket somwhere. other then that it shouldn't be evaportaing, unless you radiator is leaking.
[snapback]275955[/snapback]
[/b][/quote]
well idk i didnt pressure test it.


Ill talk to my mechanic and my dad...maybe a gasket somewhere...it is 14 years old.
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Old 01-23-2005, 10:08 PM   #6 (permalink)
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i found that the hose from the expansion tank to the the radiator is negelected when replacing other coolant hoses. Inspect it.
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Old 01-24-2005, 12:20 AM   #7 (permalink)
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its not very uncommon to need to add coolant every three weeks on an old car.
I check my coolant every two days before i start it up, along with my oil. Just a good habbit to get into.

If you keep the coolant level full does it still overheat? If not there really isn't anything to worry about. Just keep checking all the time to make sure it is full. Good luck

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Old 01-24-2005, 10:25 PM   #8 (permalink)
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maybe your aux fan is not working. when the engine heats up, pressure builds up and the rad cap opens to let coolant out. maybe that's why you're losing coolant. also, maybe you replaced your rad cap with a lower pressure rad cap, and so it opens a lot sooner. does it heat up only when you're stuck in traffick?
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Old 01-25-2005, 03:31 PM   #9 (permalink)
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Quote:
Originally posted by e30 dude@Jan 24 2005, 10:25 PM
maybe your aux fan is not working. when the engine heats up, pressure builds up and the rad cap opens to let coolant out. maybe that's why you're losing coolant. also, maybe you replaced your rad cap with a lower pressure rad cap, and so it opens a lot sooner. does it heat up only when you're stuck in traffick?
[snapback]278587[/snapback]
well i got a new radiator cap...that didnt work.
I will try to fill it up every third day..i usualluy did it every two weeks.


Also my friend commented my fan is moving very slow.
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Old 01-25-2005, 04:06 PM   #10 (permalink)
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just get a new car..haha.

but overheating is usually due to coolant, or crapz radiatorz.
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Old 01-25-2005, 09:53 PM   #11 (permalink)
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do you have a overflow catch can? if so then you shouldn't be loosing coolant at all. the coolant might overflow from the cap, but then when it cools off it should come back into the radiator.

If you don't have a catch can then when the coolant boils over on hot days it will be lost and refill will be neccessary.

Also, you could have a broken fan clutch which is allowing the fan to spin at very low speeds (like your friend said). But this will really only affect you if you do a lot of stop and go driving or sitting in traffic. Once you start moving the air flow through the radiator will illiminate the need for a fan.

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Old 01-25-2005, 10:26 PM   #12 (permalink)
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I had an overheating problem on mine, I found it was related to air not being bled from the system. The bleed screw usually takes care of it, but in my case I had to loosen up the temperature sender on the top of the engine to "burp" the last little bit of air from the system.
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Old 01-27-2005, 12:16 AM   #13 (permalink)
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Quote:
Originally posted by Abdul@Jan 25 2005, 10:26 PM
I had an overheating problem on mine, I found it was related to air not being bled from the system. The bleed screw usually takes care of it, but in my case I had to loosen up the temperature sender on the top of the engine to "burp" the last little bit of air from the system.
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well no air...i made sure of that.

Spiff...i dont need ur shit...my cars great cept for the whole overheating thing


Yea Ima add fluid every few days...if i do that it wont overheat. THe fluid is cominfg out somewhere..not really a leak though.


haha..i convinced this girl..after drving my car, to buy a 1995 325is..lol.

and guess who can drive it..hopefully...lol
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Old 01-27-2005, 01:13 AM   #14 (permalink)
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yah, i would say that your fan clutch is shot

its pretty easy to change

just check the bentley and see what they say. they also have a way to diagnose if it is shot.
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