2012 Civic EX - Problems with boiling sound and smell from engine / power loss - Page 2
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Thread: 2012 Civic EX - Problems with boiling sound and smell from engine / power loss

  1. #11
    Greenhorn
    Join Date
    Jul 2019
    Posts
    6
    Quote Originally Posted by Paulcet View Post
    I have a '12 EX with 110k miles. No sounds or smells when parked. I rarely drive it hard, but I would expect 100°F days we have had recently would be as hot as your car, and I haven't noticed anything like what you are describing. A scan tool to plug into your OBDII port would be a worthwhile investment. Temperature sensors that disagree might point you in the right direction. I'd get the coolant checked for combustion gasses.

    * * *

    Some info to compare: I connected the Ultra Gauge and monitored the coolant temperature. When just driving easy, the temperature was pretty constant at about 90°C. When driving "hard" it fluctuated between 88° and 94°. Idling in the driveway with AC off after driving "hard" the temperature climbed to 100°C when the fans came on. Fans turned off at 98°. Very slight smell of coolant. Turning the engine off, the only sounds I could hear were of the refrigerant in the AC lines (I had turned the AC back on to move into my normal parking spot.)
    Thank you Paulcet, this is really helpful info and matches some of my research about the fans not kicking on until 208 deg F, and going off at 198 deg F. Yes, an OBD II reader that gives me more than error codes (mine only does that), would be hugely helpful. I'm thinking with the radiator never going above about 175 deg F in my testing that it makes sense the aux fans aren't kicking in. I've even replaced the relay switches that control the fans / temperature sensors top and bottom too.

    Your data is really useful to me and my better half. You rock, sir. Thank you, again.
    Last edited by Sailplanes2; 08-13-2019 at 12:04 AM.

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  3. #12
    Greenhorn
    Join Date
    Jul 2019
    Posts
    6
    Quote Originally Posted by 9thgensifamily View Post
    OP, does the noise not happen if you don't use A/C? Had a car a few years ago that sounded like "boiling water" after shutting it off, came from the A/C in my case. I never did anything due to that noise. I assumed high pressure refrigerant was traveling to the low pressure side on engine shut off...or something like that.
    Now that was a great question. Truly. I asked my fiance to drive it today in 95+ F weather without using the AC at all. She did and parked it in the garage and, sure enough, no boiling sound. You've given me another great way of testing this situation and perhaps you're right, it's an AC compressor cooling down type of situation.
    Might have nailed it right there, sir.

    Next step is to drive the car myself after work tomorrow with the AC off and get 'on it' a few times and see if I can re-produce the hot car, no boiling. After that, I will have the exhaust gas check done / perhaps take it into the dealership.

    You guys have really been a huge help in chasing this gremlin ! Thanks again, all

    Kurt

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