Restoring a 2001 750iL that sat for 3 years

[XAlt]

Been trying to trace a coolant leak but cant find it. I would top it off, drive for a bit, then coolant would be low next time I check it.
Did compression test, losing pressure very slowly but cant find any leaks. Any suggestions?

If you just bled the system, it's normal for it to go down for a while.

Keep topping off.

[masu3701]

If you just bled the system, it's normal for it to go down for a while.

Keep topping off.

Checked coolant today, and level was Ok. the floating stick was over the opening of the tank.
Went for a drive, after 10 minutes I get check coolant level message. I stop the car, oven the hood and some coolant had escaped from the extension tank cap.
I did tight it up and left. 3 minutes down the road just before I get home, car started to overheat. Shut engine, get out to check level and all the coolant was leaking from the bottom of the radiator.
Put the car on the lift, and yes the radiator was leaking badly from the bottom corner. Replaced it with an old one that was laying around. Haven't replaced the coolant yet. will fill it up tomorrow.

Now am wondering why it did blow up? is it because of air in the system? though I bled it, but I guess not.

[XAlt]

The radiators are made of plastic bits, they're the same as the ones on the 740, which is what I'm assume you're using.

If it was new, I assume it'd be a QC issue, especially with the newer Behrs.

[masu3701]

The radiators are made of plastic bits, they're the same as the ones on the 740, which is what I'm assume you're using.

If it was new, I assume it'd be a QC issue, especially with the newer Behrs.

its was a Behrs, and it looked somehow new. The old one I just installed, havent tested yet is from a 740.

[mooll]

^ they can look new and be 10 years old. bought one from a 540 used that was dated 2006 but still lasted about a year and it looked brand new...

[masu3701]

^ they can look new and be 10 years old. bought one from a 540 used that was dated 2006 but still lasted about a year and it looked brand new...

I must be doing something wrong.. replaced the radiator, added coolant, bled, but after driving a a bid the coolant escapes from the expention tank cap.
When fill coolant, does the flooting stick have to come all the way up pass the opening of the tank? Am i over filling?

[XAlt]

I must be doing something wrong.. replaced the radiator, added coolant, bled, but after driving a a bid the coolant escapes from the expention tank cap.
When fill coolant, does the flooting stick have to come all the way up pass the opening of the tank? Am i over filling?

Stick has to be level with the neck.

You're overfilling for sure. The cap is venting and doing its job.

[mooll]

maybe come give u a hand, u seem pretty lost lol

[masu3701]

maybe come give u a hand, u seem pretty lost lol

Would definitely use a hand.

[XAlt]

Would definitely use a hand.

http://www.meeknet.co.uk/e31/E31_Coo...g_Bleeding.htm
ignore the bits about BMW coolant


4700910934_1f4960721c.jpg

Should always be like this. If it goes down, add more.

[masu3701]

http://www.meeknet.co.uk/e31/E31_Coo...g_Bleeding.htm
ignore the bits about BMW coolant


4700910934_1f4960721c.jpg

Should always be like this. If it goes down, add more.

Will check the level tomorrow and add if it went loo low.

[masu3701]

I am reading that the 750il coolant system does self bleed. Is that correct?

[XAlt]

I am reading that the 750il coolant system does self bleed. Is that correct?

No.

It is exactly like the 740. Drain and refill accordingly.

[masu3701]

Found a small leak on the bottom right corner of the old radiator I installed. it leaks more when pressure build up.
When I did a pressure test before refilling, I didn't notice much of pressure loss. Only a very little over time.
Ordering new radiator. this cooling system is becoming a nightmare

[XAlt]

Found a small leak on the bottom right corner of the old radiator I installed. it leaks more when pressure build up.
When I did a pressure test before refilling, I didn't notice much of pressure loss. Only a very little over time.
Ordering new radiator. this cooling system is becoming a nightmare

Radiators do that all the time, it's the nature of the beast.

[masu3701]

My radiator just came in. Will try again, hopefully I get it right this time.

[masu3701]

My radiator just came in. Will try again, hopefully I get it right this time.

Havent had a chance to replace radiator .. this morning i added coolant to correct level then took the car on 5 miles trip..coolant still coming out from extansion tank cap when under load. Checked oil dip stick and it looks ok..checked oil cap and can see some water. Doesnt look like coolant though, but there are alot yellowish gank in there. Would that be cause of the fact that the car sit for a while?
No water at the exhaust pipe. All dry.

Trying to make sure its not a blown head gasket.



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[mooll]

MILK SHAKE
looks like blown head gasket imo idk tho wait for others to chime in
i was suspicious...
you DID change the oil, right? it sat a while, that was one of first things isuggested you should do iirc

[XAlt]

Havent had a chance to replace radiator .. this morning i added coolant to correct level then took the car on 5 miles trip..coolant still coming out from extansion tank cap when under load. Checked oil dip stick and it looks ok..checked oil cap and can see some water. Doesnt look like coolant though, but there are alot yellowish gank in there. Would that be cause of the fact that the car sit for a while?
No water at the exhaust pipe. All dry.

Trying to make sure its not a blown head gasket.



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Change the oil and filter. It's essential.

I see a greenish hue.

[masu3701]

New radiator installed. Added coolant, bled system, then went on a 12 miles trip, no coolant coming out of extension tank, and no overheating. I just get "Check coolant level"
Hope I got it right this time.

[mooll]

so what up with those pics/ the oil? just was old and had water in it? looked pretty bad..

[masu3701]

[QUOTE=mooll;29623435]so what up with those pics/ the oil? just was old and had water in it? looked pretty bad..[quote]

Haven't changed the oil yet. Trying to make sure its not a head gasket before I start doing more work to the car. The guy I bough the car from said he had it and sat for 6 months, and the sticker is from 2015. So am thinking that the car sat for more then 6 months.

[mooll]

it's 35 bucks for 10 quarts of Valvoline high mileage 10w40 oil and 7 bucks for a filter ( same as 740? just one oil filter? )...that oil looked horrid man, makes no sense that u ran it like that. what if u find out its a good engine, then you've been running it with old, watery oil. i mean i guess it doesnt really matter but thats just my opinion and multiple ppl did tell you to change it and if it was me i would have and again just saying that oil looked pretty bad imo

[cbtech]

bad censor on the bottom of the expansion tank will cause that

[MKIVJZA80]

second that. do cheap flush and filter. worth 50 bucks