LT Motor Running Hot
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
I am full aware that the thermostat does not get rid of heat.235 is just kinda scary for me.Plus that extreme heat cycling is not good on the heat gaskets-ambiant temp to 235 & back constintly.The 160 degree thermostat did help with the temp rising slower but thats all it did.If my engine got to 260 degrees & was not leaking coolant I would get a waterhose & spray water on the radiator.Shutting the engine down at 260 degrees,the engine temp will continue to climb
Burning Brakes
Joined: Oct 2009
Posts: 773
Likes: 2
From: Minneapolis MN
Melting Slicks
Joined: Feb 2008
Posts: 3,286
Likes: 6
From: Palm Beach
Those are normal temps with the AC off. The fans run in tandem. Hi and Lo speed.
My LT4 runs about 200 with the AC on. I just put in my new DeWitt but havent driven it yet as the engine is out. Will be interesting to see if it makes a change.
Eddie
Eddie
My LT4 runs about 200 with the AC on. I just put in my new DeWitt but havent driven it yet as the engine is out. Will be interesting to see if it makes a change.
Eddie
Eddie
Safety Car
Joined: Dec 2008
Posts: 3,588
Likes: 10
From: North New Jersey
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
I also think the Dewitt is a good investment. The bigger the radiator, the better it is going to get rid of the heat. But whatever you have, you got to put air thru it for it to work.
About 6 or 7 years ago I installed the switch to turn on the secondary fan at my discretion. Try to keep things if stopped in traffic under 210 and definitely under 220. I do have the GM radiator but is a bit wider that the original radiator which was replaced 6 years back.
I run 193 on the open road till it gets 90-100* and all bets are off. I will run about 200-205 or so when it's just that hot which it is in Orlando. With that kind of heat off the road the cooling system is working as hard as it can.
Last edited by pcolt94; May 25, 2010 at 04:04 PM.
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
I am talking about the entire system, block AND coolant. You shut the engine off and the entire system temperature falls. Yes the coolant stops circulating and thus picks up heat from the block, but when you shut the heat source off (the engine), the systems temperature starts downward! Otherwise you are violating the second law of thermodynamics and that ain't happening!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!
Melting Slicks
Joined: Feb 2008
Posts: 3,286
Likes: 6
From: Palm Beach
Eddie
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Thread Starter
Burning Brakes
Joined: Mar 2008
Posts: 1,073
Likes: 8
From: Houston TX
If the block is hotter than the coolant the heat will transfer into the coolant. Once the block and the coolant are in equilibrium with each other they will begin to cool (at different rates...liquid vs. metal).
This can also be interpreted as the block will immediately start cooling, while the coolant temp will increase slightly before starting to decline.
Melting Slicks
Joined: Feb 2008
Posts: 3,286
Likes: 6
From: Palm Beach
As per heat transfer principals:
If the block is hotter than the coolant the heat will transfer into the coolant. Once the block and the coolant are in equilibrium with each other they will begin to cool (at different rates...liquid vs. metal).
This can also be interpreted as the block will immediately start cooling, while the coolant temp will increase slightly before starting to decline.
If the block is hotter than the coolant the heat will transfer into the coolant. Once the block and the coolant are in equilibrium with each other they will begin to cool (at different rates...liquid vs. metal).
This can also be interpreted as the block will immediately start cooling, while the coolant temp will increase slightly before starting to decline.
Eddie
Cruising
Joined: Jun 2010
Posts: 14
Likes: 1
From: New Port Richey Florida
The fans are coming on at the correct temp(228 degrees) but even when the fan is on the temps still creep up.Sometimes up to 240 degrees.It happened one time.Now anytime the temp gets to 230-235 I turn on the heater which brings temps down quickly.Is anyone elses Lt-1 running like this in hot weather?Sorry to hijack
Cruising
Joined: Jun 2010
Posts: 14
Likes: 1
From: New Port Richey Florida
2nd Gear
Joined: Aug 2010
Posts: 2
Likes: 0
I am full aware that the thermostat does not get rid of heat.235 is just kinda scary for me.Plus that extreme heat cycling is not good on the heat gaskets-ambiant temp to 235 & back constintly.The 160 degree thermostat did help with the temp rising slower but thats all it did.If my engine got to 260 degrees & was not leaking coolant I would get a waterhose & spray water on the radiator.Shutting the engine down at 260 degrees,the engine temp will continue to climb
Safety Car
Joined: Aug 2006
Posts: 4,147
Likes: 452
From: Port St. Lucie West Florida
i have a lt1 with stock system except for a Dewitts rad. The Dewitts is a great rad. but with the stock system it was about 2 dg. cooler than orig rad. It does cool down faster when cruising (from stop and go traffic)
Burning Brakes
Joined: Oct 2009
Posts: 773
Likes: 2
From: Minneapolis MN
Thread Starter
Burning Brakes
Joined: Mar 2008
Posts: 1,073
Likes: 8
From: Houston TX
I see this thread has been revived, so I will just add emphasis on how important it is to make sure your radiator (behind the A/C condenser) is clean of debris...Taking it out and cleaning it will most likely need to be done every several years.
