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1994 Pontiac Firebird OVER HEATS

Tiny
CHRISMT
  • MEMBER
  • 1994 PONTIAC FIREBIRD
  • V8
  • AUTOMATIC
  • 96,000 MILES
Hi guy's

I have a 94 pontiac formula 5.7 LT1
I hope you can help I have put a new water pump, therm, and tried to bleed the system and still over heats. The car was sitting for a couple of years in a garage. Before I got it. I tried everything I can think of too get the air out of the system, or is there another problem. Today I started the car at idle temp was good as soon as I tried to drive it the temp rises and over heats. And I can not find any leaks I pressure tested the system. Please help im lost
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Tuesday, May 20th, 2008 AT 9:09 PM

7 Replies

Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
Did you check/replace your engine coolant temperature sensor?
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Tuesday, May 20th, 2008 AT 11:33 PM
Tiny
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  • MEMBER
  • 4 POSTS
I jacked up the front and filled the system with both bleeders open and still the car over heats after you drive down the block. The I tried a tool that you hook to a air compressor that sucks down the system while the other end is in a bucket with antifreeze and water so when you open the valve the presure sucks the antifreeze in And still does the same thing. Could the radiator just be pluged when it over heats the fluid does not seem like it's 280 degrees.
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Wednesday, May 21st, 2008 AT 1:46 PM
Tiny
LEGITIMATE007
  • MECHANIC
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What way did you bleed the system?
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Wednesday, May 21st, 2008 AT 9:27 PM
Tiny
CHRISMT
  • MEMBER
  • 4 POSTS
]I jacked up the front and filled the system with both bleeders open and still the car over heats after you drive down the block. The I tried a tool that you hook to a air compressor that sucks down the system while the other end is in a bucket with antifreeze and water so when you open the valve the presure sucks the antifreeze in And still does the same thing. Could the radiator just be pluged when it over heats the fluid does not seem like it's 280 degrees.
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Friday, May 23rd, 2008 AT 12:57 AM
Tiny
LEGITIMATE007
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Did you check/change your engine coolant temp sensor?
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Friday, May 23rd, 2008 AT 7:20 AM
Tiny
CHRISMT
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No I have not. But would that make water shoot out of the over flow if the car drives about a block? Could the radiator just be plugged so there is no flow.
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Friday, May 23rd, 2008 AT 10:37 AM
Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
No, but it would make it overheat. You said you replaced the themostat, it could be clogged somewhere, why dont' you do a serious radiator flush, that should unclog whatever is going on. Pressure check the radiator cap too. What temp is the thermostat rated at.
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Friday, May 23rd, 2008 AT 10:58 AM

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