2006 GTO OverHeating?
Thread Starter
Staging Lane
Joined: Jan 2006
Posts: 99
Likes: 0
From: Edinburg, Tx
2006 GTO OverHeating? well i've been doing some reading but have yet stumbled upon someone with the same problem.. the car (2006 GTO) will overheat after drive around the block then idling.. if i start the car and let it idle it will reach 208 which is when the fans turn on and fall to 196 which is the turn off point.. once i drive the car and temp goes over 208 it will not go down and start overheating. the motor is a 408, stock ported heads and intake with a d1sc procharger..i've already changed the thermostat, radiator, water pump, head gaskets, and added a fan(pusher) infront of radiator... any information will be greatly appreaciated.
Answer these?
When it does overheat, does the coolant boil over/out? Or does it just get hot and NOT loose coolant and not bubble and make noise in the radiator?
When you take the cap off (cold engine) and start it up and wait for the engine to reach operating temp....do you see the coolant flow i nthe radiator? AND....does the coolant level stay topped off or does it drop down?
edit......anything, like a bag or newspaper, jammed up in front of your condensor.
When it does overheat, does the coolant boil over/out? Or does it just get hot and NOT loose coolant and not bubble and make noise in the radiator?
When you take the cap off (cold engine) and start it up and wait for the engine to reach operating temp....do you see the coolant flow i nthe radiator? AND....does the coolant level stay topped off or does it drop down?
edit......anything, like a bag or newspaper, jammed up in front of your condensor.
Thread Starter
Staging Lane
Joined: Jan 2006
Posts: 99
Likes: 0
From: Edinburg, Tx
Cap and antifreeze with water wetter are all new. Actually it is the second new cap.
Answer these?
When it does overheat, does the coolant boil over/out? Or does it just get hot and NOT loose coolant and not bubble and make noise in the radiator?
When you take the cap off (cold engine) and start it up and wait for the engine to reach operating temp....do you see the coolant flow i nthe radiator? AND....does the coolant level stay topped off or does it drop down?
edit......anything, like a bag or newspaper, jammed up in front of your condensor.
When it does overheat, does the coolant boil over/out? Or does it just get hot and NOT loose coolant and not bubble and make noise in the radiator?
When you take the cap off (cold engine) and start it up and wait for the engine to reach operating temp....do you see the coolant flow i nthe radiator? AND....does the coolant level stay topped off or does it drop down?
edit......anything, like a bag or newspaper, jammed up in front of your condensor.
2. yes the coolant flows and stays topped off.
3. nope.. nothing infront of radiator.
Today im gonna try just changing the temp sensor and if that doesnt work some different heads.. thank you for ya'lls input.. i really appreciate it.
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If nothing else it seems like you have replaced most other parts with new.
Hope this helps.
--Glenn
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Verdad Gallardo Probably a bad (new) t-stat.
Next time it gets hot, like up above 220*, pull over, pop the hood and put your hand on the intake. If you can leave your hand on the intake for more than 10 full seconds....you're not getting hot. Go get a new temp sensor. If you can't keep your hand on there for more than a few full seconds......get a new t-stat.
You can also take the t-stat out, hook the housing and hose back up. Go for a drive on the highway at steady cruise speed for 15 minutes. If temps stay normal, get a new t-stat. (in the city, stop and go, without the t-stat, you'll get hot, so don't do that too long).
.
Next time it gets hot, like up above 220*, pull over, pop the hood and put your hand on the intake. If you can leave your hand on the intake for more than 10 full seconds....you're not getting hot. Go get a new temp sensor. If you can't keep your hand on there for more than a few full seconds......get a new t-stat.
You can also take the t-stat out, hook the housing and hose back up. Go for a drive on the highway at steady cruise speed for 15 minutes. If temps stay normal, get a new t-stat. (in the city, stop and go, without the t-stat, you'll get hot, so don't do that too long).
.
This may sound dumb but did you change the thermostat, radiator, water pump, head gaskets, and added a fan(pusher) infront of radiator after it started to overheat or was that done when you put the 408 in? And were these aftermarket parts?
I ask because I chased my tail on our truck FOREVER because the water pump was leaking so I went to autozone and got a new one along with a t-stat. Put it in and the truck kept overheating. I wasn't losing coolant at all though this time. Confused the heck out of me until I finally pulled the water pump back off and the impeller part was loose from the pulley part if that makes sense? So in other words, I could turn the pulley part and it wasn't moving the impeller...
Now I always check to make sure they are moving together haha. Anyways, the chances of that happening twice are pretty rare I'm sure but it might be a thought if it gets down to it I guess.
I ask because I chased my tail on our truck FOREVER because the water pump was leaking so I went to autozone and got a new one along with a t-stat. Put it in and the truck kept overheating. I wasn't losing coolant at all though this time. Confused the heck out of me until I finally pulled the water pump back off and the impeller part was loose from the pulley part if that makes sense? So in other words, I could turn the pulley part and it wasn't moving the impeller...
Now I always check to make sure they are moving together haha. Anyways, the chances of that happening twice are pretty rare I'm sure but it might be a thought if it gets down to it I guess. 
Thread Starter
Staging Lane
Joined: Jan 2006
Posts: 99
Likes: 0
From: Edinburg, Tx
Probably a bad (new) t-stat.
Next time it gets hot, like up above 220*, pull over, pop the hood and put your hand on the intake. If you can leave your hand on the intake for more than 10 full seconds....you're not getting hot. Go get a new temp sensor. If you can't keep your hand on there for more than a few full seconds......get a new t-stat.
You can also take the t-stat out, hook the housing and hose back up. Go for a drive on the highway at steady cruise speed for 15 minutes. If temps stay normal, get a new t-stat. (in the city, stop and go, without the t-stat, you'll get hot, so don't do that too long).
.
Next time it gets hot, like up above 220*, pull over, pop the hood and put your hand on the intake. If you can leave your hand on the intake for more than 10 full seconds....you're not getting hot. Go get a new temp sensor. If you can't keep your hand on there for more than a few full seconds......get a new t-stat.
You can also take the t-stat out, hook the housing and hose back up. Go for a drive on the highway at steady cruise speed for 15 minutes. If temps stay normal, get a new t-stat. (in the city, stop and go, without the t-stat, you'll get hot, so don't do that too long).
.
This may sound dumb but did you change the thermostat, radiator, water pump, head gaskets, and added a fan(pusher) infront of radiator after it started to overheat or was that done when you put the 408 in? And were these aftermarket parts?
I ask because I chased my tail on our truck FOREVER because the water pump was leaking so I went to autozone and got a new one along with a t-stat. Put it in and the truck kept overheating. I wasn't losing coolant at all though this time. Confused the heck out of me until I finally pulled the water pump back off and the impeller part was loose from the pulley part if that makes sense? So in other words, I could turn the pulley part and it wasn't moving the impeller... Now I always check to make sure they are moving together haha. Anyways, the chances of that happening twice are pretty rare I'm sure but it might be a thought if it gets down to it I guess.
I ask because I chased my tail on our truck FOREVER because the water pump was leaking so I went to autozone and got a new one along with a t-stat. Put it in and the truck kept overheating. I wasn't losing coolant at all though this time. Confused the heck out of me until I finally pulled the water pump back off and the impeller part was loose from the pulley part if that makes sense? So in other words, I could turn the pulley part and it wasn't moving the impeller...
Now I always check to make sure they are moving together haha. Anyways, the chances of that happening twice are pretty rare I'm sure but it might be a thought if it gets down to it I guess.However i was reading in another forum that the fans procharger supplies tend to go out at time.. no completely die but not flow the cfm they are supposed to.. going to give spal a call tomorrow and see what they tell me.. i'll keep ya'll informed.. thanks for the suggestions though.
Registered User
Joined: Jun 2012
Posts: 1
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My stock '06 loses coolant when it overheats. It seems to be leaking from the reservoir, but I pulled it and no problem there. It does boil over. I changed the water pump, and T-stat, and can't see any other ares that are leaking. No water in the oil either.
