overheating problem
overheating problem okay, so my car has been overheating and i cannot figure it out.
the car has new rad hoses, a new heater core, new heater core lines, new thermostat, new coolant, and I've bleed and bleed the system of air and the coolant is full, the fans seem to kick on intermediately, sometimes, but not always, I've replaced the relays for them as well. it's like 30 degrees outside so the car shouldn't even get about 190 degrees while cruising, but it'll get up to 210 after about 15-20mins of cruising 55mph, and then stay there, if i give it gas while it's in gear to accelerate the car quickly overheats, if i throw it in neutral and let off the gas the car will quickly cool off, and it'll continue to do the same thing if i try and accelerate any. yet if i'm sitting at idle and i give it gas it will cool off a little, then after a few mins it will overheat.
wtf idk what to do.
help please
the car has new rad hoses, a new heater core, new heater core lines, new thermostat, new coolant, and I've bleed and bleed the system of air and the coolant is full, the fans seem to kick on intermediately, sometimes, but not always, I've replaced the relays for them as well. it's like 30 degrees outside so the car shouldn't even get about 190 degrees while cruising, but it'll get up to 210 after about 15-20mins of cruising 55mph, and then stay there, if i give it gas while it's in gear to accelerate the car quickly overheats, if i throw it in neutral and let off the gas the car will quickly cool off, and it'll continue to do the same thing if i try and accelerate any. yet if i'm sitting at idle and i give it gas it will cool off a little, then after a few mins it will overheat.
wtf idk what to do.
help please
When exactly do they kick on? Are you saying they don't come on when they're supposed to? Best thing to do is get ahold of some scanning software to see if your PCM is reading coolant temperature correctly.
Do you have the radiator/air deflector in place?
Do you have the radiator/air deflector in place?
i have no idea, prolly about 30% but since it's been overheating often and i've been having to drain it and refill it i haven't filled it with 50% coolant because i'm tired of having to drain it and buy new coolant.
yes i have the air deflector in place. idk when or if they kick on or not, the only way to tell is if the car is on jack-stands and feeling them come on from underneath, and last time i had it on jack-stands they were coming on, but it'll get hot and nothing seems to be kicking on, like it'll get around 220 and it keeps getting hot like nothing's holding it back, and i can't hear the fans whenever they're on or not over the motor running.
yes i have the air deflector in place. idk when or if they kick on or not, the only way to tell is if the car is on jack-stands and feeling them come on from underneath, and last time i had it on jack-stands they were coming on, but it'll get hot and nothing seems to be kicking on, like it'll get around 220 and it keeps getting hot like nothing's holding it back, and i can't hear the fans whenever they're on or not over the motor running.
yes i have the air deflector in place. idk when or if they kick on or not, the only way to tell is if the car is on jack-stands and feeling them come on from underneath, and last time i had it on jack-stands they were coming on, but it'll get hot and nothing seems to be kicking on, like it'll get around 220 and it keeps getting hot like nothing's holding it back, and i can't hear the fans whenever they're on or not over the motor running.
If you don't have any aftermarket PCM programming (per your sig), your temps are fine. "Overheating" is defined as getting into and past the red. These cars are made to operate around 200 - 235 degrees (default fans kick on at 227 and 235 degrees for low and high).
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Launching!
Joined: Feb 2009
Posts: 280
Likes: 0
From: bodymore
Seconded, water pump temp sensor goes to the PCM, driver side head the gauge on the dash. A lot of people forget the temp sensors. My fans were cutting on late a few weeks ago and my car was overheating and it was mostly because of the thermostat and the water pump temp sensor.
Sounds like your car is running fine. Idling in traffic it can get up to 230, but fans will kick on and bring it back down. Cruising at 55 and the gauge in the middle (190-210ish) is normal.
Check your temp sensors.
Last edited by trippinholyman; Feb 14, 2010 at 12:03 PM.
When you say new coolant was used did you replace everything in the cooling system? Did you keep track as to how many quarts you used in your mix? The LT1 cooling system has an approximate 15qt capacity. Did you do all of this because there was a problem initially or was the car fine and then started overheating after all of these things were replaced? Where did you get the thermostat? Are you sure it is LT1 specific?
Seconded, water pump temp sensor goes to the PCM, driver side head the gauge on the dash. A lot of people forget the temp sensors. My fans were cutting on late a few weeks ago and my car was overheating and it was mostly because of the thermostat and the water pump temp sensor.
Sounds like your car is running fine. Idling in traffic it can get up to 230, but fans will kick on and bring it back down. Cruising at 55 and the gauge in the middle (190-210ish) is normal.
Check your temp sensors.
Sounds like your car is running fine. Idling in traffic it can get up to 230, but fans will kick on and bring it back down. Cruising at 55 and the gauge in the middle (190-210ish) is normal.
Check your temp sensors.
When you say new coolant was used did you replace everything in the cooling system? Did you keep track as to how many quarts you used in your mix? The LT1 cooling system has an approximate 15qt capacity. Did you do all of this because there was a problem initially or was the car fine and then started overheating after all of these things were replaced? Where did you get the thermostat? Are you sure it is LT1 specific?
Sounds like you replaced everything in the cooling system except the most important part, the radiator.
Get the thing warmed up and drop the cooling fans so you can feel the radiator, you will probably find only a small part of it hot the rest will be cool because it isn't circulating coolant thru it.
Get the thing warmed up and drop the cooling fans so you can feel the radiator, you will probably find only a small part of it hot the rest will be cool because it isn't circulating coolant thru it.
On The Tree
Joined: Nov 2009
Posts: 114
Likes: 0
From: Canby, Oregon
Arghhh overheating issues frustrated me so much on my LT1! Good thing you know about LS1tech so you can get some good answers and figure out the problem. I just found out about this site after i took it out..
if i give it gas while it's in gear to accelerate the car quickly overheats, if i throw it in neutral and let off the gas the car will quickly cool off, and it'll continue to do the same thing if i try and accelerate any. yet if i'm sitting at idle and i give it gas it will cool off a little, then after a few mins it will overheat.
wtf idk what to do.
help please
wtf idk what to do.
help please
Did you try a pressure check? Just giving some ideas.Hope this helps. Good luck
