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Thread: Blew coolant bottle cap below 220f

  1. #1
    Senior Member mr_maxime's Avatar
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    Exclamation Blew coolant bottle cap below 220f

    The car started heating up and I noticed the coolant spraying in the back. Temp gauge still showed below 220.

    Adding more coolant now since I'm on the side of the road. Any idea what it could be?

  2. #2
    One of those purists you keep hearing about. sdg3205's Avatar
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    Thermostat is lying or there is air in the system.
    Dave

    Here, somewhere.


  3. #3
    Senior Member mr_maxime's Avatar
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    I just got home after adding coolant.

    Thankfully, I was 4 miles from home and a good Samaritan came to help me. It took 1.5 gallons of coolant to get it back to a proper level. Temp gauge was back down while driving home. The water pump pulley was still turning when the car was running. There was no back pressure on the coolant pipes next to the pump, which the samaritan said it meant the thermostat was open. AC was on so the fans were on. My alternator belt did break about 2 weeks ago which led to the car overheating past 220. I hadn't bled the system since, but I will once it cools down.

  4. #4
    One of those purists you keep hearing about. sdg3205's Avatar
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    Quote Originally Posted by mr_maxime View Post
    I just got home after adding coolant.

    Thankfully, I was 4 miles from home and a good Samaritan came to help me. It took 1.5 gallons of coolant to get it back to a proper level. Temp gauge was back down while driving home. The water pump pulley was still turning when the car was running. There was no back pressure on the coolant pipes next to the pump, which the samaritan said it meant the thermostat was open. AC was on so the fans were on. My alternator belt did break about 2 weeks ago which led to the car overheating past 220. I hadn't bled the system since, but I will once it cools down.
    The samaritan is incorrect. No system pressure is indicitvie of a bad rad cap or system leak. Nothing to do with the thermostat.

    You need to pressure test.
    Dave

    Here, somewhere.


  5. #5
    TGTF (Too Greek to Function) AugustneverEnds's Avatar
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    I am really surprised your car blew the pressure cap, you refilled it without bleeding the system and managed to drive 4 miles. If 10287 had ANY air enter through the cap I wouldn't make it 1000ft without having to purge the air out. I strongly suspect your cap is defective and you have a leak somewhere.
    Nick A.
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    1988 BMW 325iS
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  6. #6
    Delorean Guru
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    Quote Originally Posted by mr_maxime View Post
    I just got home after adding coolant.

    Thankfully, I was 4 miles from home and a good Samaritan came to help me. It took 1.5 gallons of coolant to get it back to a proper level. Temp gauge was back down while driving home. The water pump pulley was still turning when the car was running. There was no back pressure on the coolant pipes next to the pump, which the samaritan said it meant the thermostat was open. AC was on so the fans were on. My alternator belt did break about 2 weeks ago which led to the car overheating past 220. I hadn't bled the system since, but I will once it cools down.
    If you previously overheated the motor you may have overheated it to the point where you damaged the head gaskets. Now combustion gasses can enter the cooling system, overpressurizing it and blowing out coolant. There is a quick and easy test. If you did pop the head gaskets the only cure is to replace them. There can be other bad effects from overheating, it depends on how hot it got. They include warped heads, bad liner seals, coolant in the oil, etc. BTW, when you lose that much coolant (1.5 Gal), the temperature gauge can no longer give you an accurate reading.
    David Teitelbaum

  7. #7
    Senior Member mr_maxime's Avatar
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    I know i checked the coolant level this weekend, maybe I didnt put the cap back on properly. Would that cause any issue?

  8. #8
    One of those purists you keep hearing about. sdg3205's Avatar
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    Possibly, because you're increasing the likelihood of expansion and a boil over by removing the variable of pressure.
    Dave

    Here, somewhere.


  9. #9
    Senior Member mr_maxime's Avatar
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    I did bleed the coolant from the water pump about half an hour ago. I just checked the oil and it is not milky.

    When I previously overheated it was below the first red tick. I'm going to lose it if that was the start of the damn problems cause that was a brand new DMC belt that broke with less than 60 miles of use.

  10. #10
    One of those purists you keep hearing about. sdg3205's Avatar
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    Blew coolant bottle cap below 220f

    What red tick?

    Never mind, I get it - the gauge.
    Dave

    Here, somewhere.


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