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1994 Firebird Formula 381ci LT1 / TH400+GV O/D
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Under what conditions do you experience the above overheating - at idle, during local part throttle driving, at freeway speeds under part or heavy throttle?

What is the coolant mixture?

When you open the radiator cap after a high temp event, is the coolant full, to the top of the fill neck?

Do you have the correct LT1-specific thermostat? What temperature?

Is the engine modified in any way? Stock program or reprogrammed PCM?

Manual or auto trans?

Is A/C functional?

Have you verified fan operation. A 94 can have two different fan strategies - early production: 2 relays, fan #1 on at 226°F, fan #2 on at 235°F. Or - late production: 3 relays, both fans on low speed at 226°F, both fans on high speed at 235°F.

Have you scanned the PCM for codes? There are codes for the coolant temp sensor in the water pump housing, and for the fan relay signal circuits.

Any signs of a blown head gasket?
 

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Administrator
1994 Firebird Formula 381ci LT1 / TH400+GV O/D
Joined
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14,975 Posts
No ac, auto trans, no codes no engine mods, the fans don’t cut on due to wiring, the thermostat is set at 180, the coolant is the a mix of water an coolant.
Are you saying the fans aren't working at all, or are you indicating the fans are controlled by some aftermarket device?
 
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