Running hot, where to start?
Thread Starter
Junior Member
Joined: Jul 2007
Posts: 41
Likes: 0
From: Birmingham, AL
Car: 1991 Camaro RS
Engine: 355
Transmission: BTO 700R4
Axle/Gears: 4th gen 3.73
Running hot, where to start?
My 10.5:1 355 runs hot (200-210) only when the weather is warm and I get on it. I rode through the mountains a few weeks ago in mid 80's weather and it ran around 200 or unless I was cruising. Well now its in the 90s and I know its going to run hot. I'm running just water and water wetter. I've flushed the entire cooling system. Should I look at replacing the radiator first or look at an aluminum water pump. I'm running a 180 degree thermostat. Whenever the engine gets hot it cools back down (180-185) within 5 minutes.
Junior Member
Joined: Apr 2008
Posts: 62
Likes: 1
From: South Carolina
Car: 87 Iroc-Z
Engine: 5.7L
Transmission: 700R4
Axle/Gears: 3.27 BW
Re: Running hot, where to start?
My 10.5:1 355 runs hot (200-210) only when the weather is warm and I get on it. I rode through the mountains a few weeks ago in mid 80's weather and it ran around 200 or unless I was cruising. Well now its in the 90s and I know its going to run hot. I'm running just water and water wetter. I've flushed the entire cooling system. Should I look at replacing the radiator first or look at an aluminum water pump. I'm running a 180 degree thermostat. Whenever the engine gets hot it cools back down (180-185) within 5 minutes.
Thread Starter
Junior Member
Joined: Jul 2007
Posts: 41
Likes: 0
From: Birmingham, AL
Car: 1991 Camaro RS
Engine: 355
Transmission: BTO 700R4
Axle/Gears: 4th gen 3.73
Re: Running hot, where to start?
you running a mechanical fan? how fast were you moving when it was 200 or less? you have the air dam in front to deflect the air up into the radiator. 200 is a little high at any speeds over 40
Thread Starter
Junior Member
Joined: Jul 2007
Posts: 41
Likes: 0
From: Birmingham, AL
Car: 1991 Camaro RS
Engine: 355
Transmission: BTO 700R4
Axle/Gears: 4th gen 3.73
Re: Running hot, where to start?
Electric fan. I was driving up the mountain and behind some traffic but I would say 30-60mph. The air dam is in good shape. I'm pointing to either the water pump or radiator. When its not 80+ degrees out it runs 170.
Re: Running hot, where to start?
my 406 with stock fans and radiator stays around 160-170 above 50 mph, i have a hiflow pump on it and 180 stat. probably wanna look into a nice water pump and get that fan turning on a little earlier
Thread Starter
Junior Member
Joined: Jul 2007
Posts: 41
Likes: 0
From: Birmingham, AL
Car: 1991 Camaro RS
Engine: 355
Transmission: BTO 700R4
Axle/Gears: 4th gen 3.73
Re: Running hot, where to start?
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Supreme Member
iTrader: (1)
Joined: Apr 2007
Posts: 1,196
Likes: 0
From: BUFFALO, NY
Car: '89 IROC-Z
Engine: 355
Transmission: 700r4 edge 3000 stall
Axle/Gears: 9-bolt 3.73
Re: Running hot, where to start?
thats not hot at all thats pretty normal. as long as its under 220 your fine
Supreme Member
iTrader: (1)
Joined: Aug 1999
Posts: 2,842
Likes: 6
From: Rowlett, TX
Car: 1988 GTA
Engine: 5.0 TPI
Transmission: T5
Axle/Gears: 9 Bolt, 3.45
Re: Running hot, where to start?
How old is the radiator? It might be worth flushing it out, or replacing it. Also, FYI it's hard on the water pump to run 100% water. Antifreeze lubricates the bearings in it. I always put a gallon of antifreeze in, and the rest water.
Senior Member
Joined: Nov 2005
Posts: 670
Likes: 1
From: Michigan
Car: 1984 Camaro Berlinetta
Engine: 355
Transmission: Th-350
Axle/Gears: 3.23
Re: Running hot, where to start?
If it a car stays under 200* w/o struggling then you have no problems.
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