overheating 3.8 series 1 s/c engine - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-05-2007, 03:28 PM   #1
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Default overheating 3.8 series 1 */c engine

ok,yesterday my car overheated to the point that it was inches away to hit the red markings on my tempeture gauge.I pulled over,and carefully popped the cap open,and the gasket on the radiator cap ir ripped in two pieces,you guys think thats why my car is overheating,or id it another problem that maybe you guys have in mind!
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Old 08-05-2007, 09:11 PM   #2
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Which areas were wet with coolant? If you are overheating the thermostat may have stuck closed or a leak should be present.

It sounds like you found an issue with the radiator cap...but are there any other spots that are wet? The coolant outlet under the nose of the supercharger is a composite from the factory and does degrade/break over time until it is replaced with a metal piece. That is another possibility.
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Old 08-07-2007, 03:43 PM   #3
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naw naw,there was no leakage whats so ever,i just ppped my cap open and the gasket was ripped in two pieces,plus the other day,i was juming a 69 mustng cause it was dead on his battery and i rompped my car to 3500 rpm for at least 3 minutes ann guys,my dam exhaust manifolds turned bright red.i mean bright red,like there were freken burning,i dont think thats normal,whats wrong with my car,why is the manifolds turning bright red?
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Old 08-07-2007, 03:48 PM   #4
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Do you have a scantool? I suggest you check for KR.
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Old 08-07-2007, 05:21 PM   #5
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Revving your car for that long to 3500 under no load? VERY bad.

Glowing manifolds? Probably running lean. Check your fuel pressure, and don't ever rev your motor that high for that long.
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Old 08-07-2007, 06:03 PM   #6
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You shouldn't have to rev to jump another car.
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Old 08-08-2007, 01:36 AM   #7
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some people think its that my cat is clogged,what do you guys think?
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Old 08-08-2007, 03:38 AM   #8
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You may have burned some valves
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Old 08-08-2007, 04:22 AM   #9
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so then, there was coolant in the radiator then? sounds like thermostat or WP? and red hot is lean. and probably had a huge amount of KR due to the heat. that probably did nothing good for that engine. i've overheated mine, and it still runs perfectly, but then again isn't supercharged, so you MIGHT be ok if you track down the problem.

definitely change your oil now tho, oil is never any good after an overheating.

didn't see it mentioned, but were you getting any codes?
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Old 08-08-2007, 09:33 AM   #10
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Quote:
Originally Posted by SSEi93
some people think its that my cat is clogged,what do you guys think?
Please read the posts above... Those people that responded were giving you their advice on what they thought the causes could be.
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