Mechanics

LT1 THERMOSTAT REPLACEMENT

Chevrolet Corvette

My 95 Vette (Chevrolet Corvette 1995 60,000 miles 5.7 L.) Started running hot yesterday. Everything seems in order (fluid level/fans running) and I am assuming the thermostat is stuck partially closed. I am a fair mechanic and would like to replace the thermostat. Is it located on the top-front of the engine at the point the upper radiator hose connects to the engine?
Avatar
Sazaisan
May 31, 2007.




Yes, the upper radiator hose connects to the housing. You should flush the cooling system also if it hasn't been done regularly, according to the owners manual.
AD

Tiny
Rudpro
Jun 4, 2007.
OK, so I replaced the thermostat (it was the easiest thermostat I have ever replaced), and flushed the cooling system again (I did that last November also) and the engine still runs hotter than I think it did before and hotter than I think is should. By the way, the thermostat is connected to the lower radiator hose, not the upper one. I checked the fan fuses and they are OK and the fans come on at 225 degrees. At highway speeds the temp stays down around 208 but as soon as I start driving city streets the temp goes up to 230 sometimes. Is this normal? I thought it ran closer to 205 before, but I could be mistaken. The memory is the second thing to go when we get to be my age.

Tiny
Sazaisan
Jun 7, 2007.
Sorry about that. I looked at the picture and thought it was the top. I should have read the procedure.


http://www.2carpros.com/forum/automotive_pictures/74660_Vette_1.jpg



Your 'vette should not be running at 230 degrees. First, replace your radiator cap or have it pressure tested. A cap that doesn't hold pressure could cause it to overheat. Some questions. Did you use Dex-cool anti-freeze and mix it 50-50 with distilled (or filtered) water? Did you jack up the front end when filling the cooling system to get the air out? You might have air in the system if you didn't. Did you flush the engine block with the car idling, temperature control on high, flushing water through the heater hose that attaches to the block? Or did you only flush the radiator? Do you have an analog gauge on the dash that might not be accurate? You may want to take the radiator out and clean the fins with a high pressure garden hose, also check for debris betwen the radiator and AC condensor. While it's out flush it again paying attention to how the water flushes through. You might have scales inside the radiator restricting flow. You could try doing a chemical flush yourself or take the radiator to a radiator repair shop and have them flush it. They can do a more thorough job of flushing and while the radiator is out, clean your AC condensor with a garden hose.

Tiny
Rudpro
Jun 8, 2007.
OK, so I replaced the thermostat (it was the easiest thermostat I have ever replaced), and flushed the cooling system again (I did that last November also) and the engine still runs hotter than I think it did before and hotter than I think is should. By the way, the thermostat is connected to the lower radiator hose, not the upper one. I checked the fan fuses and they are OK and the fans come on at 225 degrees. At highway speeds the temp stays down around 208 but as soon as I start driving city streets the temp goes up to 230 sometimes. Is this normal? I thought it ran closer to 205 before, but I could be mistaken. The memory is the second thing to go when we get to be my age.[/Quote: d284b29b59]

Did you open the air bleed screw on top of the thermostat housing (waterneck)?
Check the front of the radiator and condenser for blockage. These cars are like Hoover vacuum cleaners going down the road, I know, I've had a " 94 Vette and have a '96 Vette now.

My 2 cents,
GWH

Tiny
GWH
Aug 10, 2007.

AD