305 TBI standard operating temp?

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Jun 12, 2010 | 12:15 AM
  #1  
Well I'm finally driving my Firebird again! But I have a question regarding engine temp, since it seems to like running warmer than my other car.

When I bought the car, the relay for the cooling fan went bad, so the owner hot-wired the fan to an in-dash switch, rather than fixing it the right way (seems like a lot of effort for a half-assed fix to me, but whatever, lol). I had this fixed. I also had a coolant temp sensor replaced.

Driving around today, I noticed (particularly in crappy traffic) that the engine was getting as hot as about 230 F or so, but when it reaches that point, the fan kicks back in and cools it back down to about 210-200F or so. Sometimes a bit lower at cruising speeds on the freeway.

Just wondering if this is normal for a 305, or if I should check out the radiator/coolant levels? thanks!
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Jun 12, 2010 | 12:20 AM
  #2  
Re: 305 TBI standard operating temp?
Quote: Well I'm finally driving my Firebird again! But I have a question regarding engine temp, since it seems to like running warmer than my other car.

When I bought the car, the relay for the cooling fan went bad, so the owner hot-wired the fan to an in-dash switch, rather than fixing it the right way (seems like a lot of effort for a half-assed fix to me, but whatever, lol). I had this fixed. I also had a coolant temp sensor replaced.

Driving around today, I noticed (particularly in crappy traffic) that the engine was getting as hot as about 230 F or so, but when it reaches that point, the fan kicks back in and cools it back down to about 210-200F or so. Sometimes a bit lower at cruising speeds on the freeway.

Just wondering if this is normal for a 305, or if I should check out the radiator/coolant levels? thanks!
I would change the thermostat to a lower one...180 degrees...you probably have 195 installed...at the same time I would make sure no part of my radiator was plugged...that it was flowing properly...the 230 is 30 degrees too high for me but stop and go sucks too...lol
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Jun 12, 2010 | 01:38 AM
  #3  
Re: 305 TBI standard operating temp?
The TBI cars are fan switch operated (not ECM) at 238º for the fan (or, by HVAC controls set to A/C). A cooler thermostat on a stock car is useless.
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Jun 12, 2010 | 01:44 AM
  #4  
Re: 305 TBI standard operating temp?
How about this = http://www.mamotorworks.com/corvette-3-138-944.html Would that help .If so, I'm thinking of just buying the fan switch for $19.99 and putting it were the stock switch is.
(The stock fan is just a back-up fan for my primary fan,that is automatically on with start-up and manually switched. )
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Jun 12, 2010 | 01:52 AM
  #5  
Re: 305 TBI standard operating temp?
SW505 $9 @ Autozone, 215° turn on.
Regardless, a 180° t-stat isn't going to improve anything on a stock motor.
Especially, a stock TBI.
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Jun 12, 2010 | 02:20 AM
  #6  
Re: 305 TBI standard operating temp?
Quote: The TBI cars are fan switch operated (not ECM) at 238º for the fan (or, by HVAC controls set to A/C). A cooler thermostat on a stock car is useless.
Thanks!

Yeah, I'm just making sure it's normal before I start getting worried. I'm not bothering w/any mods to the 305. In the process of getting a few more things fixed on the car before body work & paint, then doing a 5.7 +trans swap of some kind
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Jun 12, 2010 | 03:09 AM
  #7  
Re: 305 TBI standard operating temp?
I've seen mine hit 260 before on really hot 104 degree day running the A/C. I was in stop and go traffic for 3 miles.
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Jun 14, 2010 | 09:26 AM
  #8  
Re: 305 TBI standard operating temp?
Quote: SW505 $9 @ Autozone, 215° turn on.
Regardless, a 180° t-stat isn't going to improve anything on a stock motor.
Especially, a stock TBI.
All I know is my car (stock 305 tbi) almost never gets to 220 with my 180 thermo. In fact I rarely go over 200 degrees. When I had the 195 thermo in I ran a lot higher. Now maybe because I also added the TPI induction mod but either way my car has never got close to running hot or the fan turning on unless the AC is involved. I made these changes in 2007.
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