Thread: 98 GTP with excessive pressure in cooloing system

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  1. #1 98 GTP with excessive pressure in cooloing system 
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    PLease help

    I have recently completed a head gasket job on a 98 GTP and all of a sudden after driving it fine for about a week I started to notice a bulge in the upper radiator hose and went to bleed it and discovered a ton of air/pressure
    I bleed it all out and it keeps coming back
    There is no water in oil no leaks anywhere and Im stumped
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  2. #2 Re: 98 GTP with excessive pressure in cooloing system 
    Turbo is the way to go. BillBoost37's Avatar
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    Do a compression and cylinder leak down test. Both cold and warm. if you have a leak of combustion gasses into the coolant jacket, it would be happening at the HG.

    Which bolts and what torque etc did you use?
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  3. #3 Re: 98 GTP with excessive pressure in cooloing system 
    Moderator dsmuts's Avatar
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    Maybe your radiator cap is bad. Did you reuse the stock head bolts or put new in?
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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