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#31
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For routine bleeding, such as after cooling overhaul (WP replacement etc.), I just do simple things: 1. Engine Cold and Off. 2. Open bleeder screw near the tstat (remove it but don't lose it). 3. Fill the reservoir with the 50-50 mixture until it is 1" above KALT or roughly about 2" from the rim. Now, be patient! It is a slow process and coolant will flow out of the bleeder hole. 4. Re-install the bleeder screw (just snug it, don't force it!), then make sure coolant is still about 2" from the reservoir rim. Replace the cap. Now go for a test drive in the neighborhood with heat on etc., drive until the engine is hot. Then go back home, park the SUV. Wait 1-2 hours, then check coolant level, it should settle down to MAX area. I have done this trick many times (overfill just a tiny above KALT when COLD) and it works. Very very easy.
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1998 E39 528i 5sp MT 2006 E53 X5 3.0 6sp MT |
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#32
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Hi all....
The day before yesterday my coolant looked a little low so I added some. Then after driving to work something went sideways. On my drive home from work my check coolant message came up. I live near my work so I drove home with a close eye on the temp gage. When I checked the bleeder screw I found the top had broken off. I took the hose off to make it easier to work on and it was a PITA to get the broken part out of the hole but I did finally. I don't really think I over tightened the bleeder screw but it is possible. Luckily I had one in my old used parts box. I saw somewhere that if you overfill the ET what isn't needed in the system will push out of the ET cap. Did I overfill the ET? Thoughts???? :
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I love this forum!!!! Alan 1999 BMW 328i sedan with auto...In progress... 2002 BMW X5 3.0i with auto...In progress... 2007 BMW Z4 3.0i 6 speed manual...In progress... |
#33
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If you overfill the pressure will build to either lift the 2bar (29psi) cap or burst / break something. An older system will typically have a part failure before the cap lifts. Many install a 1.2bar (17psi) cap. Better to slightly under fill than overfill.
A 50/50 glycol mix at 1.2bar has a boiling point of 270F. A 50/50 glycol mix at 2 bar is about 295F ( couldn’t find the exact number so used the estimate of 3F/psi from 280F@24psi)
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A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams 2003 X5 4.6is Estoril Blue 2005 Infiniti G35X 1972 Datsun 240Z 1991 Isuzu Impulse XS Sold 1972 Fiat 850 Spyder Donated 1972 Datsun 240Z Sold 1972 Datsun 510 Sold Last edited by jcp240z; 03-03-2019 at 01:08 AM. |
#34
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Where would one buy a 1.2bar cap that fits our reservoir?
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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M. |
#35
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I’ve been using an e30 1.4 bar cap for 5 years now. I feel way safer with it. The only retarded car in the world with a hose / expansion tank / radiator / valley pan exploding 2 bar cap.
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2006 4.8is, Black on White. SOLD Sniff Sniff. 2017 F85 x5m, Black on Red. BEAST MODE "The older we grow the greater becomes our wonder at how much ignorance one can contain without bursting one's clothes." - Mark Twain Unlock OBC post 5 |
#36
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Quote:
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I love this forum!!!! Alan 1999 BMW 328i sedan with auto...In progress... 2002 BMW X5 3.0i with auto...In progress... 2007 BMW Z4 3.0i 6 speed manual...In progress... |
#37
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Cool, thanks for the pointer! Got it from dealer for only $17.
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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M. |
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