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milknit59
 
Join Date: Oct 2007
Location: newburgh, ny
Posts: 22
325i Runs hot

i have a 1987 325i convertible e30. it started running hot awhile back. have heat. i changed out the thermo switch at the radiator after testint the connection per bently. car still running hot. it only runs hot when sitting. driving down road needle stays in safe zone. bought another thermo switch and still running hot.
any ideas?
thanks
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1987 325i conv
2002 318 is
1986 735 i
Old 11-18-2007, 05:47 AM
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You will need to troubleshoot between the thermostat, water pump, fan clutch, and there is a remote chance that you radiator may be clogged up.
Old 11-18-2007, 09:48 AM
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milknit59
 
Join Date: Oct 2007
Location: newburgh, ny
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i replaced the thermo last week and i believe the water pump is working because both top and bottom hoses are hot. also there is heat. for some unknown reason the aux. fan will not kick on also i blead the system and a steady stream of fluid came out. no air bubbles
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1987 325i conv
2002 318 is
1986 735 i

Last edited by milknit59; 11-18-2007 at 10:39 AM.. Reason: forgot something
Old 11-18-2007, 10:38 AM
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Test the primary fan clutch. The primary fan should keep you from overheating in most circumstances.

Test the aux fan switch to make sure it is ticking on. If so then see if the aux fan is getting power. If so the fan is dead if not then its a relay or fuse.

Make sure to run the heater and rev the engine while bleeding it.
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Old 11-18-2007, 07:10 PM
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milknit59
 
Join Date: Oct 2007
Location: newburgh, ny
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it appears that there is a faulty fan clutch, however the aux fan does not work properly

the aux Fan works when jumped at the harness
the aux fan goes on when the ac button is pushed on
the aux Fan does not go on when temp goes up, there is a new thermo switch installed

all fuses and relays appear to be fine

now what?
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1987 325i conv
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1986 735 i
Old 11-23-2007, 06:00 AM
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By the time the temp needle moves past TDC the aux fan should already be on.

I would say aux fan switch in the side of the radiator, but you say you replaced that right?

I'd have to look at a wiring diagram but I think there are two relays on high and one low speed. I cant think of what else distinguishes the AC operation of the aux fan from the fan switch operation. Check the wiring between the fan switch and the relays.
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Old 11-23-2007, 06:20 PM
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milknit59
 
Join Date: Oct 2007
Location: newburgh, ny
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Angry

yea i replaces the switch in the side of the radiator twice bedause i thought the fist new one was bad, i swapped out diff. relays to see if they worked abd everything seems fine and again i can get the aux fan to run if i jump to connections at the switch harness
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Old 11-26-2007, 12:28 PM
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I reread the thread and looked at the wiring diagram.

Since your fan switch is working and jumping at the switch is activating the fan then I would say the radiator is not getting hot enough to trip the fan switch. If the engine is running too hot at the same time then the radiator isn't getting enough coolant flow so I say:

air in the system
thermostat
water pump
blockage/obstruction
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Old 11-26-2007, 01:52 PM
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milknit59
 
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ok jeron im with you on all that
i replaced the thermostat a few weeks back and bled the system
i get heat. doen't that mean the water pump is working?
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Old 11-27-2007, 09:43 AM
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If the water pump were not working at all it would overheat quickly. Since it runs cool at high rpm then the water pump is at least partially working but it needs higher rpm to get sufficient flow. Check the tensioner of the water pump belt.

A partial obstruction could cause the same effect.

Air in the system could also cause the same effect but usually you will not get heat at idle.

Water pumps are pretty cheap. I'd replace it, pull the radiator and make sure it is clean inside and flows water easily, flush water through the engine and make sure it looks clean as well.
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Here: 1997 M3/4 Byzanz/Magma ~ 2006 Yamaha R6 ~ 1997 R1100RT ~ 1991 Ford F-150 5.8l ~ 2015 Kia Optima
Gone: 2001 330i Silver/Grey ~ 98 Camry V6 ~ 97 Camry I4 ~ 97 Mazda 626 I4 ~ 93 Sentra SE-R ~ 88 Toyota Truck I4
Old 11-27-2007, 11:25 AM
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milknit59
 
Join Date: Oct 2007
Location: newburgh, ny
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Angry

ok here i am again
this is what has been replaced with new:
1. thermo switch in radiator
2. water pump
3. primary fan clutch
4. water pump
5. thermostat

this is what i have now
temp guage pushing red zone
no aux fan, no primary fan, no patience

is there a thread for junk BMW's
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1987 325i conv
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1986 735 i
Old 12-01-2007, 04:14 PM
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I know you are tired of hearing the word AIR?
But if you will humor me.
How are you bleeding the air?
The reason I ask is I've been fooled more than once. As a matter of fact, I hate to admit it but just recently, and I've done it dozens of times on e30 e 36 and Z3.
I thought had the air out, the car does fine on the hiway, and as soon as I stop at a red light the car overheats.
Also, the reservour will lie to you if there is any air present in the system.

I don't mean to make it sound simple, because somtimes it isn't, but what you describe sounds like it could be air driving you crazy, and to the poor house.
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74 911 targa blk on blk, Carrera fend., tires & whls. gone, missed
85 325e bought new, totaled after 20 years & 465K miles, trouble free service.
01 Ford Ranger 4dr stpsd 4wd. I drive,here
88 325i convert. only 98k miles,gone, sold
93 325i.here, 98 Z-3 roadster. gone, 08 128 cabro gone
Old 12-01-2007, 10:16 PM
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milknit59
 
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when i bleed the system i start the engine and let it warm up
turn the heat on
under the hood i back oof the bleed screw on the thermo housing whole the engine is reved up a bit
every time i have done this all i got was a steady stream of green antifreeze
since i imediately see a steady stream i close it up and i am on my way
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Old 12-02-2007, 10:41 AM
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I've never been able to get it done on the first burping.
You may need to bleed it again after you drive it a little.
I always carry a jug of water with me on a short once around the block.
Leave the cap a little loose or leave the vent loose on the short drive.
But don't go far enough to let it over heat.
Stop on the side of the road if you have to.
As soon as the gauge starts to climb, stop and check the level.
If it is low you might hve solved your problem.
If not, it did't cost anything but a little time.
I sometimes even find it low and get some air out when I check it the next day after a commute to work.
Good luck with it. Hope this helps.
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74 911 targa blk on blk, Carrera fend., tires & whls. gone, missed
85 325e bought new, totaled after 20 years & 465K miles, trouble free service.
01 Ford Ranger 4dr stpsd 4wd. I drive,here
88 325i convert. only 98k miles,gone, sold
93 325i.here, 98 Z-3 roadster. gone, 08 128 cabro gone
Old 12-02-2007, 07:06 PM
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coldbear1's description on bleeding the air sounds way too familiar. LOL

I'm constantly answering questions about our cooling systems and yet I still cant bleed mine the first time every time.
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Here: 1997 M3/4 Byzanz/Magma ~ 2006 Yamaha R6 ~ 1997 R1100RT ~ 1991 Ford F-150 5.8l ~ 2015 Kia Optima
Gone: 2001 330i Silver/Grey ~ 98 Camry V6 ~ 97 Camry I4 ~ 97 Mazda 626 I4 ~ 93 Sentra SE-R ~ 88 Toyota Truck I4
Old 12-02-2007, 08:25 PM
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milknit59
 
Join Date: Oct 2007
Location: newburgh, ny
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Question

one more try
loosened reservoir cap and drove to post office and back 10 miles total. now in driveway with reservoir cap off and idling for about 20 min
temp guage reads between 1/2 & 3/4 marks. i think this is better than before
but i still have no aux fan
both top and bottom radiator hoses are hot
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1986 735 i
Old 12-03-2007, 12:53 PM
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milknit59
 
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forgot ot say it is only 35 degrees here. would that matter
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Old 12-03-2007, 12:54 PM
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I would think so.
I can't imagine why the aux fan should ever come on at 35F ambient temp.
Unless the a/c is on. Don't have much experience with that though. I live in Florida.
But I am very familiar with overheating at more like 95-100F.
Did the coolant level drop?
Did you have to add coolant?
Did it boil over?

Have you tested the temp sensors?
There are several of them.
__________________
74 911 targa blk on blk, Carrera fend., tires & whls. gone, missed
85 325e bought new, totaled after 20 years & 465K miles, trouble free service.
01 Ford Ranger 4dr stpsd 4wd. I drive,here
88 325i convert. only 98k miles,gone, sold
93 325i.here, 98 Z-3 roadster. gone, 08 128 cabro gone
Old 12-03-2007, 01:54 PM
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milknit59
 
Join Date: Oct 2007
Location: newburgh, ny
Posts: 22
even at 35 degrees if the temp rises high enough the aux fan should come on
no coolant loss while driving with lllse cap
put add in local paper to sell
thanks anyway
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1987 325i conv
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1986 735 i
Old 12-06-2007, 01:07 PM
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You might try 100% H2O without any antifreeze. Water has better cooling capacity than antifreeze. Worked for me in Nevada. Just don't forget to winterize your car!
Old 10-24-2017, 11:15 AM
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