1997 Pontiac Firebird Engine Temp guage fluctuating

Tiny
OMAR321
  • MEMBER
  • 1997 PONTIAC FIREBIRD
  • V8
  • 2WD
  • MANUAL
  • 129,000 MILES
My 97 pontiac firebird/trans am was recently worked on by a friend mechanic. The issue was the coolant leaking due to bad radiator. Another issue was the fan - was told that it was modified by the previous owner to keep it always running and thus the temp never reached optimum temp 210 (middle mark).

Fast forward. He undid the modification and put a new (fan relay in). Now the temp goes up to 210 but takes a while. Then it will even go past 210 during times of idling to about 240. On the freeway it tends to go too low to 180 deg.

Any ideas about the temp fluctuation? I'm concerned about over heating as this has happened once since the repair. I've been trying to determine when the fan starts but can't pick up the sound when the car is on. PS the thermostat was taken out and tossed, no replacement.
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Friday, February 26th, 2010 AT 8:10 AM

3 Replies

Tiny
SCOTTY DEE
  • MEMBER
Did you say there is no thermostat in place? Is there any type of an orafice in lieu of the t-stat?
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Friday, February 26th, 2010 AT 9:17 AM
Tiny
OMAR321
  • MEMBER
Correct, thermostat was taken out and after determining it was defect the mechanic threw it out and said it's not necessary to replace it because it never gets cold enough for water to freeze (here in sacramento, ca). I do not know if there is anything in place of the thermostat. I could ask the mechanic if it's important.
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Saturday, February 27th, 2010 AT 6:29 AM
Tiny
SCOTTY DEE
  • MEMBER
It's not a matter of whether it gets cold enough to freeze, you've got to have a thermostat in place in order for the engine to work properly.
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Saturday, February 27th, 2010 AT 7:13 AM

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