Thread: L36 Overheating

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  1. #1 L36 Overheating 
    SE Level Member overdose666's Avatar
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    2003 Monte SS with 140k

    Hit the danger zone on the temp gauge today, got it home and checked it out. Definitely blew the t-stat gasket. Bout 2 weeks ago it overheated on me, all the gaskets were fine but i had boiled off most of my coolant, oil was clean and i tore down to the LIM and didnt see any stray coolant, at that time i replaced the T-stat and flushed the coolant. For the past few months I've had issues with the coolant boiling off, even after a 10 min drive to taco bell, when i stop i can hear the coolant in the over flow boiling.

    In spring of 2010 I replaced the water pump, LIM gasket, t-stat, and radiator fans. All of which are holding up fine. I know theres a bigger issue causing this but I cant figure it out.

    Any suggestions?
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  2. #2 Re: L36 Overheating 
    Moderator dsmuts's Avatar
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    Upper intake manifold cracked?
    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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  3. #3 Re: L36 Overheating 
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    water pump? correct chemistry of the coolant? purged the coolant system at the thermostat housing? enough coolant in the system?

    Colleen
    : CAI, HV3, 2.5" d/p w/h/f cat. Full suspension, PowerSlots w/Hawk HPS, GR2s, Sonar projectors. Needs tune. Awaiting install of FBod brakes.
    Shianne: 98 L36 MM5. Good start to a LONG project.
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  4. #4 Re: L36 Overheating 
    GTX Level Member QUICKSILVER462's Avatar
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    The radiator cap is directly responsible at keeping pressure raising the boiling point. You have not stated that you inspected or replaced it.
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  5. #5 Re: L36 Overheating 
    SE Level Member overdose666's Avatar
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    Quote Originally Posted by QUICKSILVER462 View Post
    The radiator cap is directly responsible at keeping pressure raising the boiling point. You have not stated that you inspected or replaced it.
    That I havent and ti completely slipped my mind, that will probably be the next thing i try.

    UIM is solid, with a new gasket and no visible leaks. When the coolant was last touched i did a thorough flush, and got it topped off. I'm not sure of the warranty the new water pump came with, but the gasket is fine and its not making any odd noises so I'll assume its fine for now, although i may come back to it.
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  6. #6 Re: L36 Overheating 
    SE Level Member overdose666's Avatar
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    Radiator cap was bad, I feel stupid lol. Atleast it was a cheap fix.
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