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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 07-03-2005, 11:18 AM   #1 (permalink)
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My 86 325es runs hot - at higway speeds, the temp gauge is in the upper half of the spectrum. Add some steep hills or the hot desert sun and it actually goes in the red and I have to blow heat inside my car to keep it from overheating.

I recently noticed that I can't remember the last time the auxilary fan (In front of the radiator) turned itself on. Is there any way to test this fan?
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Old 07-03-2005, 06:54 PM   #2 (permalink)
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Quote:
Originally posted by DeathMetal@Jul 3 2005, 11:18 AM
My 86 325es runs hot - at higway speeds, the temp gauge is in the upper half of the spectrum. Add some steep hills or the hot desert sun and it actually goes in the red and I have to blow heat inside my car to keep it from overheating.

I recently noticed that I can't remember the last time the auxilary fan (In front of the radiator) turned itself on. Is there any way to test this fan?
[snapback]359266[/snapback]
When you turn on your A/C the fan should automatically come on no matter what the temp of the engine is. The first thing I would check is the resitor, they do go out and it's the cheapest thing to replace when dealing with the aux fan.
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Old 07-03-2005, 09:03 PM   #3 (permalink)
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cool. Where is this resistor?
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Old 07-04-2005, 12:31 AM   #4 (permalink)
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Quote:
Originally posted by DeathMetal@Jul 3 2005, 06:03 PM
cool. Where is this resistor?
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i just had the same problem, start with the fan first.. but hopefully it wont come to what i had a problem with.. the water jackets are really tiny in the m20 and prone to clogging.. had to take my motor apart and clean out the water jackets and replace the HG because the HG was clogged with a bunch of calcium which severely restricted the waterflow.

big pita.
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Old 07-06-2005, 09:18 AM   #5 (permalink)
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You would think that at higway speeds, you'd have enough airflow, regardless of fans, to keep the engine in the normal range. The auxillary fan isn't for cooling the engine... although it helps a little. It's there to blow air through the condenser for your A/C.

I think maybe the problem lies elsewhere, but I hope it doesnt come to what nukeduster thinks it is.
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Old 07-06-2005, 10:55 AM   #6 (permalink)
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Quote:
Originally posted by offabroadway@Jul 6 2005, 08:18 AM
You would think that at higway speeds, you'd have enough airflow, regardless of fans, to keep the engine in the normal range. The auxillary fan isn't for cooling the engine... although it helps a little. It's there to blow air through the condenser for your A/C.

I think maybe the problem lies elsewhere, but I hope it doesnt come to what nukeduster thinks it is.
[snapback]360043[/snapback]
That's what I thought as well but then I thought that maybe, since the fan is not working, its stationary blades are obstructing part of the air-flow into the radiator.
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Old 07-08-2005, 01:36 AM   #7 (permalink)
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your issue is beyond the aux fan. time to start troubleshooting the cooling system. make sure your coolant is full and purged of air and the water pump and thermostat are operating properly to start with. with those three items in check you should be able to maintain a proper temp even without the clutch or aux fan, as long as you're not running the ac or sitting in traffic or beating the piss out of the car.

i ran my car with no fans up until last month. i was able to keep the temp gauge a few needles below 1/2 at all times except for using the ac or sitting in traffic, at which point it only went to about the 5/8 position and went right back down as soon as i was moving again

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The auxillary fan isn't for cooling the engine
it most certainly is. its triggered at 196 and 210 degrees for low and high speed operation respectively.
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Old 07-11-2005, 01:17 PM   #8 (permalink)
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My gut feel is the water pump if she runs hot at speed. With my E32 I could run normal temp at speed but not in traffic and it was the fan clutch, even the aux fan running at it's high speed cold not cool this beast. Old rule of thumb was that you do not need a fan for engine cooling above about 45 MPH constant speed as long as the water pump is good.
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Old 07-11-2005, 01:29 PM   #9 (permalink)
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The waterpump is brand new and the hoses are hot - that means that the coolant is being pumped. My concern is that the stationary blades of the non-functioning aux fan are somehow interfering with the airflow to the radiator at speed. Is this possible?
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Old 07-11-2005, 06:23 PM   #10 (permalink)
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Possible but not too likely. Does the aux fan run with AC selected? If she does not run then either the fan resistor is bad or the fan switch (the part that screws into the radiator). I have the how to for E32 but not E30, someone on the board have a Bentley and care to wade in?
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Old 07-11-2005, 11:13 PM   #11 (permalink)
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yes the blades will impede flow, but it will not cause you to run hot. i ran with the aux fan in place but not working as well as with it gone, no difference. what's the deal with your clutch fan? do you have one? how about the thermostat? coolant full and free of air?

like i said before, as long as you have full air free coolant, a working water pump, and working thermostat, then you should not be running hot, especially on the highway. if all of those items check out, then my only guess is clogged water passages like what nukeduster had.
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Old 07-14-2005, 10:19 AM   #12 (permalink)
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Old 07-16-2005, 05:21 AM   #13 (permalink)
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the AUX fan is need to cool the engin. one day i plug out the aux fan to see if it will make a difference and yes the temp needle creapes up high, plus i dont even have a fan shroud and a bad fan clutch(it just spin with no force)
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Old 07-16-2005, 11:32 AM   #14 (permalink)
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Alright! New development: The AUX fan works when I turn on the AC, which means that the fan motor itself is fine. This leads me to believe that the temperature switches are bad, Does anyone have a link to a "how-to" on checking and replacing these switches?
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Old 07-16-2005, 01:26 PM   #15 (permalink)
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Quote:
Originally posted by DeathMetal@Jul 16 2005, 10:32 AM
Alright! New development: The AUX fan works when I turn on the AC, which means that the fan motor itself is fine. This leads me to believe that the temperature switches are bad, Does anyone have a link to a "how-to" on checking and replacing these switches?
[snapback]362763[/snapback]
there is three wires that goes to the switch. the middle wire is the negative/ground. just get a wire to middle wire and jump it to the other wire on the connection, the fan should come on. i forgot what wires are for the low speed and the high speed but when you try it you will find out.
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