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N52 330i Upper Radiator Hose/Heater Core Inlet Hose Leak
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12-05-2016, 04:18 PM | #1 |
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N52 330i Upper Radiator Hose/Heater Core Inlet Hose Leak
Hey I was wondering if anyone has replaced the heater core inlet hose on a 2006 330i or maybe any e90/e92 with an N52 since they'll probably be similar. I haven't really found a DIY. Looks like I have a leak at where the heater core inlet hose tees into the underneath of the upper radiator hose.
If you have, is it doable from the top or do I need to get underneath? How difficult of a DIY is this and any special tools or seals or maybe o-rings? |
12-10-2016, 08:25 AM | #2 |
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Not sure which choses you are referring to but i did thé pne that runs over the radiator, between the expansion tank to the nipple on the water pipe between the oil filter assembly and the radiator. That nipple broke during disassembly because the plastic was cooked. Install of these 2 hoses was short. I had to drain and vent the coolant. Overall about 3 hours of relaxed work and 200 on parts and expedite shipping to get the big hose that broke in 1 day
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12-10-2016, 10:28 AM | #3 | |
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The one that seems like it's gonna suck tees off the bottom of the upper radiator hose. It goes straight down, then turns and heads straight toward the firewall. It's one of the heater core hoses I think, from looking at part manuals. I'll have to take a better look at it today. I think I know the hose you're talking about. It's pretty small and taps into the top of the upper radiator hose. |
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12-11-2016, 06:12 AM | #4 |
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You must have missed my DIY of replacing the entire set of nine (9) cooling system hoses on the '06 N52. The hose you are talking about runs off a tee from the upper radiator hose and goes off to the firewall heater core connection. You have to get the air box out of the way to work on it. The heater core connections are a bit of a bitch to work on. DIY is here:
http://www.e90post.com/forums/showthread.php?t=936250
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A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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12-11-2016, 09:18 AM | #5 | |
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Another discovery was that instead of the valve cover gasket being bad like I thought, almost all of the valve cover bolts were loose! Especially in the corner where the most oil leaked, they weren't even hand tight! So I tried tightnening them but was super scared of breaking them. Ended up snapping one of them in the corner by the oil filter housing. Ordered a new set of bolts and going to replace them all since they're one time use. And going to grab a more accurate torque wrench since I don't trust mine. |
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12-11-2016, 12:36 PM | #6 | |
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A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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12-11-2016, 08:44 PM | #7 | |
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The loose bolts make sense because the loosest bolts were on the front passenger side and there was a lot of oil leaking there but nowhere else. So I'm going to try the bolts for now, if not then I'll have to do the valve cover gasket and some other stuff. It's the metal gasket on the early n52 as well so hopefully it's not ruined. |
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12-12-2016, 04:18 AM | #8 | |
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A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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12-12-2016, 07:01 AM | #9 | |
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01-30-2023, 09:22 PM | #10 |
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O-ring Replacement on Heater Core Hose at Upper Radiator Hose Tee Lower Connection
I am in the process of replacing my radiator (with a CSF all-aluminum radiator), upper and lower radiator hoses, and coolant expansion tank and hose. Doing this cause I had a leak somewhere near the radiator and my expansion tank float broke not too long ago. After putting in the new parts, topping up with a coolant flush kit and water, and running the engine, I noticed a leak coming from the upper radiator hose tee lower connection (heater core hose?). I thought, weird, I inspected everything and things looked ok, and even put a light film of silicone grease on the mating fittings to hopefully prevent the hoses from seizing to the fittings if I were to have to replace anything in the future. With my inlet air manifold removed and the car running (I know, risky) I was able to push and pull on that lower hose connection on the upper radiator hose and see coolant gushing out as I flexed it. Turned the car off, removed that hose and inspected. Couldn't see anything obvious like a torn inner hose o-ring or damaged fitting sealing surface, so I decided to remove the inner o-ring and measure with a set of calipers. I noticed that the lower connection on the tee fitting of my new Rein upper radiator hose was about .865" diameter, while the old Contitech measured at .881" diameter. I suppose .016" diameter variation might be ok, although that tolerance does seem kind of wide. Measured the ID of the o-ring and it was around .874". The o-ring had some compression set, and some flat surfaces on it so I'm pretty sure there's no contact on the o-ring ID with the Rein hose's smaller fitting diameter. I couldn't find the part on RealOEM, not sure it's sold by BMW or the particular diagrams are not accurate or missing, so I bought some from McMaster-Carr (PN 1288N172 ) for $6.21 per 5-pack...Viton 75 Durometer AS568-212 size (7/8 ID [.859 actual] / 1-1/8 OD [1.137 actual]. I'll update again in the next day or two once I get the parts and install...
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04-29-2023, 05:02 PM | #11 | |
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