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    Coolant hose exploded...

    So, in a pretty eventful night, I ended up stuck in traffic at 12 in the morning. I was going downhill, so I was just idling the car, and working the brake while the car stayed in neutral. Then I heard a 'pop' and white smoke came pouring out of my hood. After opening the hood, I see this:




    I would assume the hose failure was due to being very old, but is there anything else that would cause high coolant pressure? My temp gauge was happily sitting at center. I've never seen it go past center, but it certainly starts from cold as the car warms up.

    Now, when I was driving, I heard a 'tap-tap' sound that wasn't engine speed related, but only seemed to be audible when I was really moving. I pulled over the first time I heard it, and found a loose connector. I stuck it back in place, thinking I conquered the noise, but it came back. After that hose exploded on me, I looked again, but that connector was still there. Possibly related?

    Who sells the most affordable silcone version of that hose? I did some brief searching, and it looks like they have the radiator upper and lower hoses easily available, but haven't seen one for the water pump to t-stat yet. Is there a 'pet-name' for that hose?

    Lastly, what would you recommend to clean all this coolant out of the engine bay? Just Simple Green + roll of paper towels?

    Thanks in advance!
    DD - 1986 325ES w/M20B25 swap, 4.10 LSD
    DD - 1998 R1
    Rest In Pieces - 2000 A4 1.8TQM

    #2
    Mine did that during a drift event.... heard the pop and smoke everywhere....

    It's interesting tho that my hose broke right at the part where it meets the radiator on the top right (e radiator)

    I always just thought that since i was beating the shit out of my car it broke... I dunno why yours exploded like that at idle???


    '89 325i - Totaled... good bye my love...
    '87 327i budget stroker - SOLD!!!
    '92 240sx - ca18det powered drift toy - SOLD!!!
    '89 325i - coupe - NEW daily
    '96 Audi A6 Quattro- Grocery getter/baby hauler
    '99 Busa - weekend wheelie monster

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      #3
      That "tap-tap" sound was probably the fan hitting the hose. You're missing the plastic clamp that holds the hose back and prevents that from happening.

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        #4
        Good call... I'll check it out. I wasn't the one who did the swap, so I'm still figuring out what has been done to the car. There seems to be a lot of loose trinkets here and there. A missing clamp certainly doesn't sound far fetched.
        DD - 1986 325ES w/M20B25 swap, 4.10 LSD
        DD - 1998 R1
        Rest In Pieces - 2000 A4 1.8TQM

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          #5
          Originally posted by bmwguru007 View Post
          That "tap-tap" sound was probably the fan hitting the hose. You're missing the plastic clamp that holds the hose back and prevents that from happening.
          the OP did say that it wasnt engine speed related, so unless he has a electric fan...

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            #6
            Bad engine mounts will also allow the hose to come in contact with the fan. You may want to check those too.

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