Radiator Problem/question
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This is a discussion on Radiator Problem/question within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; hey ive noticed that my coolant level fluxuates a lot in the reserve. Its low when im easy on the ...

  1. #1
    Registered User Yellowsubi's Avatar
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    Radiator Problem/question

    hey ive noticed that my coolant level fluxuates a lot in the reserve. Its low when im easy on the car then after enthusiastic driving it fills up. Is this normal? also after driving pretty hard i can hear bubbling coming from the radiator cap up by the intercooler.. is that a bad sign as well? car doesnt overheat at all except i saw it creep higher than normal spot when going up a longgg hill

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    Registered User Sarra's Avatar
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    Quote Originally Posted by Yellowsubi View Post
    hey ive noticed that my coolant level fluxuates a lot in the reserve. Its low when im easy on the car then after enthusiastic driving it fills up. Is this normal? also after driving pretty hard i can hear bubbling coming from the radiator cap up by the intercooler.. is that a bad sign as well? car doesnt overheat at all except i saw it creep higher than normal spot when going up a longgg hill
    The overflow acts as an expansion bottle. The radiator cap (which is located on the water box) has a pressure rating on it; when you heat the car up under normal driving, you heat the coolant up and it expands, increasing pressure in the coolant system. Once it hits that pressure rating, the radiator cap allows coolant to flow from the water box to the overflow bottle. When you romp on it, you run more boost, higher revs, and heat up the engine more, which increases the pressure more, hence more coolant in the overflow.

    If you go drive really hard on a 120 degree day and let that overflow fill up a bit, then park the car and come check it a few hours later at night, when the ambient temp is in the 60's, the coolant will get pulled back into the waterbox through the hose going into the overflow. That will prevent the upper radiator hose from collapsing; if it does collapse, you've got a defective radiator cap.

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    Registered User Yellowsubi's Avatar
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    that all makes sense, thanks a lot, but is it normal for me to hear soft boiling noises coming from that upper radiator cap (water box cap)?

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