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Thread: Changed coolant reservoir, car won't start now. 2004 325i

  1. #1
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    Exclamation Changed coolant reservoir, car won't start now. 2004 325i

    Found the fault of the coolant leak, the expansion tank was cracked, simple replacement swapped for a new, but car will not start now.

    Car sat in the garage for 3 days, day one I took out the defective tank and was able to confirm the tank was cracked. Waited for two day shipping for the new one and today I replaced it without any issues. Except the car won't start. Lights go on and you can hear a buzz noise in the second position, going to the third position and it won't turn on. I tried this twice and realized the battery may of drained(it is 0f outside, but about 35f in the garage). So I tried jumping it with another car and there was a slight difference as the car did rumble a bit but not start. What am I missing? I took confirmed everything I unplugged was plugged back in.

    Sorry if my explanation doesn't describe it very well, I can make a video if needed.

  2. #2
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    Cooling system wouldn't cause a no-start, unless you accidentally clobbered something during the repair. I think the battery is a more likely culprit. Might have a bad cell...
    Johnny Murray

  3. #3
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    Charge the battery and recheck

  4. #4
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    Remove battery and visit your local autoparts retailer for a free battery load test.
    A jack of all trades, master of none.

  5. #5
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    Battery is 2-3 months old and I've tried using my jump starter and using another vehicle to jump start it

  6. #6
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    Quote Originally Posted by nuby View Post
    Battery is 2-3 months old and I've tried using my jump starter and using another vehicle to jump start it
    So it cranks but won't start then? Did coolant get somewhere it should not have during removal?

  7. #7
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    When batteries are discharged at below freezing temps, they also freeze!
    quit the jump starting, get that battery inside and on a charger,
    for at least an overnight charge and thaw!
    A jack of all trades, master of none.

  8. #8
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    I will bring the battery in to charge up and get back to it

  9. #9
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    So it cranks but won't start then? Did coolant get somewhere it should not have during removal?
    Everything just poured straight down into the pan, I didn't see any electrical down there
    Last edited by nuby; 01-07-2018 at 11:53 PM.

  10. #10
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    Most likely you left something on and your battery completely dried. Take it out and charge it, should be good to go.

  11. #11
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    Battery was taken to the shop and completely charged and verified it held it's charge

  12. #12
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    This the buzz sound I get in the second position,
    and the attempt at starting the car.

  13. #13
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    Is the fuel pump kicking on?

  14. #14
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    Quote Originally Posted by dhurley34 View Post
    Is the fuel pump kicking on?
    I don't know what I'd be looking for to see if the fuel pump was kicking

  15. #15
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    Turn the key on and listen for the pump to prime (buzzing from under the back seat).

    On a side note. When the tank cracked, did the engine run hot? Reason I ask, is that does not sound like a healthy cranking engine.

  16. #16
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    Quote Originally Posted by dhurley34 View Post
    On a side note. When the tank cracked, did the engine run hot? Reason I ask, is that does not sound like a healthy cranking engine.
    The temp never went to an unsafe level, all the tank did was leak through the crack over a span of a couple hours

  17. #17
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    The clue I get from that video is to check your CPS sensor.
    A jack of all trades, master of none.

  18. #18
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    Quote Originally Posted by MIKYZZ4 View Post
    The clue I get from that video is to check your CPS sensor.
    Wouldn't the dash light up with a couple errors? I'll see if I can check out the cps, I'm assuming your talking about the intake correct?

  19. #19
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    Crankshaft Position Sensor, or as BMW calls them "pulse generator", as there is not much movement of the tach during engine turnover.
    Try to confirm with a diagnostic scan, or checking and testing of the connections and sensor resistance(ohms).
    A jack of all trades, master of none.

  20. #20
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    Quote Originally Posted by dhurley34 View Post
    Turn the key on and listen for the pump to prime (buzzing from under the back seat).
    Fuel Pump is definitely working

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