Site Account
 -Online Users

 -General Forum
 -Tech Forum
 -News Archives





General Forum : New Radiator in!

- BMW E21 Community
   - General Forum
      - New Radiator in!
melloh   Posted Sunday, Apr 8th 10:00am [Edit] [Quote] [IMS] [View car]
Post nr. 531
California, USA (San Jose)
1980 320is, 1991 318is
Just wanted to share my joy, here. New rad, new water pump, & new set of hoses installed today w/ full flush. Man it feels good. Turns out the "Super Duty Cooling System " radiator that Top-End sells is just an oem replacement made by Nissens that can be bought for like $40-80 less anywhere else.... so a few bucks wasted, but oh well. Too late now. Was able to start it up and ran it @ temp for ~5min to circulate the water and so far, no leaks anywhere! Tomorrow morning will top it off. WOO HOO!

Next on the list if to tweak that WUR (thanks JRCOOK!) to get my sys pressure right, then find out what the popping sound is @ revs over 4k, and then deal w/ surface rust (oy... not excited about this one)... a lot of which I was enlightened to today. But, for now, the car is finally streetable!

ArnZ   Posted Sunday, Apr 8th 12:40pm [Edit] [Quote] [IMS] [View car]
Post nr. 87
Qld, Australia
BMW 323i
good work mate,
feels good when ur car is back to normal and able to be used again

melloh   Posted Sunday, Apr 8th 10:38pm [Edit] [Quote] [IMS] [View car]
Post nr. 536
California, USA (San Jose)
1980 320is, 1991 318is

Ok, so tooling around the streets, it stays at or under 1/2 - great!

So, decided to do a "traffic simulation" (or drive-thru) and have the car sit and idle for 5 mintes. It slowly crept up and up and up, over the 3/4 mark. at this point, I turned the heater vents on full and revved to 2k to cool it down to 5/8 and shut it down. Got out of the car to find it had been dripping out of the overfill tube at the top of the radiator neck. Any ideas what I can do now (besides never stopping)? Is it a bubble? Bad thermostat (it's ~5 yrs old)? Thaoughts anyone? Thanks much.

BruceH   Posted Monday, Apr 9th 2:49am [Edit] [Quote] [IMS] [View car]
Post nr. 1116
Atlanta, GA USA
81 323 Baur, 85 745
Have you checked your fan clutch?

melloh   Posted Monday, Apr 9th 9:16am [Edit] [Quote] [IMS] [View car]
Post nr. 539
California, USA (San Jose)
1980 320is, 1991 318is
Uhhh... no clutch? I think my car has no fan clutch (m10). its bolted to the water pump and spun by belt. I replaced the water pump and it's definitely spinning. I suppose I could do the newspaper test, but I honestly dont think I need to b/c that, as I understand, is usually for cars w/ fan clutch (correct me if I'm wrong, tho).

BruceH   Posted Monday, Apr 9th 3:13pm [Edit] [Quote] [IMS] [View car]
Post nr. 1117
Atlanta, GA USA
81 323 Baur, 85 745
Sorry, I was thinking of the 323. No newspaper test needed as no clutch on the m10.

Greg323i   Posted Monday, Apr 9th 6:40pm [Edit] [Quote] [IMS] [View car]
Post nr. 317
Melbourne, Australia
1982 Hennaröt 323i
Did you bleed the cooling system, or is that just 323i specific as well?

melloh   Posted Monday, Apr 9th 9:34pm [Edit] [Quote] [IMS] [View car]
Post nr. 540
California, USA (San Jose)
1980 320is, 1991 318is
I highly doubt bleeding is engine-specific (though I'm guessing you were being facetious ). I'm not exactly sure what classifies as bleeding. Everything (rad, twin channels, block) was completely drained and flushed until water came out clean and clear. Then, I hooked everything up (pump, T-stat, hoses, radiator) and topped off the rad. Ran it (w/ heater set to high) for ~5 min at temp (revved @ ~2k to increase flow), let it sit and cool overnight, then toppped off the rad. My doubt has now been raised as to whether or not this is the correct precedure....

sunbeam***   Posted Monday, Apr 9th 9:55pm [Edit] [Quote] [IMS] [View car]
Post nr. 287
wirral UK
1982 323i
If your cooling circiut does not have a bleed valve then i suggest leaving the uppermost coolant hose loose the engine side of the stat is best , then top up the system (with the heater valve to hot) and make sure all of the air is expelled from the loose top hose and water runs before tightening the clamp.

Greg323i   Posted Tuesday, Apr 10th 3:51am [Edit] [Quote] [IMS] [View car]
Post nr. 319
Melbourne, Australia
1982 Hennaröt 323i
Nah, not being facetious. Owning a 6-cylinder, I'm not sure if the 4-cylinder has a bleed screw, which is located on the top of the thermostat housing on my car. That needs to be opened when the system is being filled until coolant comes out of it and then closed off.

melloh   Posted Wednesday, Apr 11th 3:56am [Edit] [Quote] [IMS] [View car]
Post nr. 541
California, USA (San Jose)
1980 320is, 1991 318is
Unfortunately, as you all surmised, there is no bleed valve. So, should I completely drain the sys again and start over?

myersport   Posted Wednesday, Apr 11th 4:50am [Edit] [Quote] [IMS] [View car]
Post nr. 184
east tennessee
'82 320iS. '91 327iC
The fill point on the m10 engines is the highest point of the cooling system, therefore no bleed screw. If you are still getting overheating problems, it is possible that you have head gasket problems. Or a bad gauge. I have experienced both, with exactly the same symptoms you are describing.

melloh   Posted Wednesday, Apr 11th 5:47am [Edit] [Quote] [IMS] [View car]
Post nr. 542
California, USA (San Jose)
1980 320is, 1991 318is
Huh.. thos certainly are not pleasant thoughts. Are there any at-home methods of determining what it may be?

g323   Posted Wednesday, Apr 11th 8:14am [Edit] [Quote] [IMS] [View car]
Post nr. 120
323i 1982
melloh, what i do if i cant find a bleed screw is the following.

I unplug the highest coolant hose i can find, and i fill it up with water, to the top. Or alternatively, you can make your highest coolant flow point even higher.

BruceH   Posted Wednesday, Apr 11th 3:32pm [Edit] [Quote] [IMS] [View car]
Post nr. 1118
Atlanta, GA USA
81 323 Baur, 85 745
You can test for combustion gases in the coolant with a kit . Simple and relatively cheap. This could eliminate the head gasket.

Thread Administration

Copyright © 2001-2005 All rights reserved. Powered by Unified.