This may have a simple answer, but if so; i haven't found it yet, so here goes.
While driving my 2000 z3 recently the top radiator hose popped off the radiator. The clamp was still on the hose but the hose was not connected to the radiator. Obviously all of the coolant gushed out, luckily i was able to make it to a gas-station before it overheated.
I was able to re-attach the hose; tighten the clamp down, refill and bleed the reservoir. It ran fine again for several days; then did the same thing; upper hose popped off.
This has happened three times now, I am uncertain as to where to start. The hose seems intact and fits on snugly, the clamp seems to be tightening down; although i don't know the spec for this.
Any suggestions?
Is the radiator spout intact?
-Abel
- E36 328is ~210-220whp: Lots of Mods.
- 2000 Z3: Many Mods.
- 2003 VW Jetta TDI Manual 47-50mpg
- 1999 S52 Estoril M Coupe
- 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
- 2019 M2 Competition, self-tuned, 504whp
- 2016 Mini Cooper S
Yes, as best as i can tell it doesn't appear to have any damage. Logically, im guessing either the hose/clamp won't hold under normal pressure, or I'm generating more pressure than normal. Not sure how to go about figuring that one out.
Check inside the hose and see if part of the neck broke off. I once had issue and neck looked ok, until I realized that a perfect 1/2" of the neck broke off and was in the hose.
Current Cars
2008 BMW M5 6 spd
1995 BMW 540i 6 Spd
2016 M4 Cabrio 6 spd
2017 X5 35d MSport
2017 i3 94ah Rex
Former Cars
2013 135i MSport Cabrio DCT
2012 BMW X5 35d Sport
2000 BMW Z3 2.8 Roadster MSport Impala Brown
1992 BMW 535i 5 Spd
2011 BMW X3 2.8i MSport Alpine White
1995 BMW 530iA Artic Silver
1986 BMW 635CSi Bronze Mettalic
2009 Dodge Ram 2500
-Abel
- E36 328is ~210-220whp: Lots of Mods.
- 2000 Z3: Many Mods.
- 2003 VW Jetta TDI Manual 47-50mpg
- 1999 S52 Estoril M Coupe
- 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
- 2019 M2 Competition, self-tuned, 504whp
- 2016 Mini Cooper S
A couple of things come to mind. A blown head gasket can cause this by allowing combustion pressure into the coolant system. Let's hope that's not your problem.
I'm also worried about this: "...luckily I was able to make it to a gas-station before it overheated." Aluminum engines tolerate almost no additional operation once coolant is lost. Many of these engines have been destroyed by attempting this. Let's hope yours is not one of them.
That is a good point too. I've seen a blown headgasket X3 2.5 shoot water 5+ feet in the air from the expansion tank as I was *trying* to bleed it after a new thermostat/wp (which didn't fix the overheating). Exhaust gases making it into the coolant system while revving it a little, to get the coolant moving.
-Abel
- E36 328is ~210-220whp: Lots of Mods.
- 2000 Z3: Many Mods.
- 2003 VW Jetta TDI Manual 47-50mpg
- 1999 S52 Estoril M Coupe
- 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
- 2019 M2 Competition, self-tuned, 504whp
- 2016 Mini Cooper S
Thank you all for the advice. I'll check the radiator neck for damage and go from there. Last two times is popped off the engine was revving about 3000 rpm. The blown head gasket theory certainly sounds plausible. Assuming i have to tear into her to replace the head gasket, and assuming the block isnt warped from the initial pop-off, what else should i plan to do while i'm at it?
I'd check the "neck" as well. I had it happen to me and I didn't see it at first. It's what made me overhaul my cooling system. The same thing happened to me while I was pulling out of a parking lot. I ended up clamping the hose all the way at the tip in order to hold and not put any pressure on the neck itself.
Broken neck would be preferable to head gasket.
As mentioned earlier, check that your hose neck on the radiator has the ridge intact at the end which gives the hose/clamp something to grip on.
If thats ridge is intact, are you running (stock type) black rubber hoses? I have seen aftermarket silicone hoses (usually blue in color) that simply won't stay connected to the neck, no matter how tight the clamp is.
-Donny
Update
I pulled the upper hose off the radiator and inspected the neck. At first glance it is fully intact.
Feeling the radiator hose I noticed something 'hard' inside it. I dumped it out and removed to semi-circular pieces of plastic.
Needless to say it looks like the last 1/8 inch of the neck split off the radiator in a perfect circle.
This portion is wider in diameter than the remaining neck and I'm assuming was what kept the hose in place when clamped on.
I've temporarily relocated the clamp closer to the radiator; until I can buy a new one.
Thanks all for the advice.
Next question, where is a good replacement available from?
I had the same issue. Hose popped off two times. Bought a replacement radiator from a local guy with life time warranty (not a wise decision, but had to do it - ~$160). Months passed and no issue at all. I have exact same car, 2000 2.3 with 119K on it.
Good luck.
If you're looking for basic value (but you do get what you pay for) look at www.Rockauto.com (more specific https://www.rockauto.com/catalog/x,c...oling%2BSystem ) , they have some options, including a radiator for $132 +~$10 shipping.
-Abel
- E36 328is ~210-220whp: Lots of Mods.
- 2000 Z3: Many Mods.
- 2003 VW Jetta TDI Manual 47-50mpg
- 1999 S52 Estoril M Coupe
- 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
- 2019 M2 Competition, self-tuned, 504whp
- 2016 Mini Cooper S
Thank you for the validation; glad to hear i am not the only one who has experienced this. When you say 'local guy' any suggestions where i might start my search. I live in Arkansas, so not a lot here locally that i am aware of.
This is what mine looked like when the hose popped off... if this is what happened... radiator should be replaced.
1993 E36 325i (RIP)
1995 E36 325i (SOLD)
1987 E30 325i (SOLD)
1990 E34 535i (SOLD)
2001 Z3 2.5i Roady (SOLD)
2001 Z3 3.0i Coupe (SOLD)
1997 E36 328IC (SOLD)
Definitely the neck. Happened to me as well.
2001 Z3 3.0i -Oxford Green/Sandbeige
2016 428xi -Estoril Blue II/Black
2018 430iC- Estoril Blue II/Black
2018 330it - Melbourne Red/Venetian Beige/Black
Bookmarks