Coolant boiling out of overflow
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Northstar Engines and System Technical Discussion Discussion, Coolant boiling out of overflow in Cadillac Engine Technical Discussion; ^ does this mean bad headgaskets? its not my caddy but a friend of mine has an 96 STS with ...
  1. #1
    CadillacSTS42005's Avatar
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    Coolant boiling out of overflow

    ^ does this mean bad headgaskets? its not my caddy but a friend of mine has an 96 STS with this problem and it has overheated a few times. I was thinking maybe the return line could be blocked or the cap could be bad. I know overflow is a sign but i though it was usually just overheating.

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    krimson_cardnal's Avatar
    krimson_cardnal is offline Cadillac Owners Enthusiast
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    Re: Coolant boiling out of overflow

    seems like you have identified the first issues to check out. wouldn't jump right to a head gasket.

    baby steps, eliminate the obvious first.

    what's the maintenance history on the cooling system??

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    Re: Coolant boiling out of overflow

    he bought the car about a year ago it only has 78K on it and before it was bought i believe he changed all the fluids

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    gabriel84 is offline Cadillac Owners Member
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    Re: Coolant boiling out of overflow

    I have a 99 sts.. when I start it I can smell coolant coming out the mufflers along with a white smoke for about 15 minutes..I have to be refilling the coolant frequently.. it doesnt overheat though.. I dont know what to do

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    Re: Coolant boiling out of overflow

    Yes, that is one sign of a bad head gasket. This has been discussed many many times. Check to be sure the purge line is clear. Check the water pump belt tensioner. Check the cap. Check to be sure the thermostat is opening when it should.

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    Re: Coolant boiling out of overflow

    i know its been discussed many times and i hate to be guilty of perhaps one of the things i hate the most about people on this forum posting topics without searching to see if its already been explained, however the car doesnt have alot of miles and hes kept up with the maintenance and has no other signs of HG failure no coolant loss just boiling out and none coming out of the exhaust just overheating and boiling out.

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    Re: Coolant boiling out of overflow

    Well, sometimes shit happens, but don't condem the head gaskets til you check the simple, easy & cheap things first.

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    Re: Coolant boiling out of overflow

    thats what i figured but he lives an hr and a half away and if it was the heads i was gonna tell him not to waiste his time and gas to come here for me to tell him your fuked man haha

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    Harry Yarnell is online now Cadillac Owners Fanatic
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    Re: Coolant boiling out of overflow

    Are the fans coming on? What's the temp numbers from the INFO display?

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    Re: Coolant boiling out of overflow

    idk i left him a message and hes comin over tomarrow for me to look at it thanx alot thus far guys!

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