overheating issues
Thread Starter
Race Director
Joined: Dec 2000
Posts: 14,697
Likes: 584
From: Sioux Falls SD
overheating issues
over the weekend the car started overheating to the extremes, coolant looks good and so does oil so pretty sure no head gasket problems.
i just replaced the water pump and thermostat and still the same thing.
i am running a dewitts radiator, i have driven the car quite a bit since installing the radiator
fans are coming on also when they are supposed to.
any ideas??
pretty much have ruled out anything cooling system related i am guessing pretty sure no air in the system or it would have shown up well before now.
upper big rad hose is getting hot but the bottom big passener one is not getting warm during engine operation
i just replaced the water pump and thermostat and still the same thing.
i am running a dewitts radiator, i have driven the car quite a bit since installing the radiator
fans are coming on also when they are supposed to.
any ideas??
pretty much have ruled out anything cooling system related i am guessing pretty sure no air in the system or it would have shown up well before now.
upper big rad hose is getting hot but the bottom big passener one is not getting warm during engine operation
Last edited by dvandentop; Jul 2, 2010 at 09:46 PM.
Drifting
Joined: Mar 2005
Posts: 1,424
Likes: 21
From: Placitas New Mexico
Sure sounds like air in the system. Have you tried removing the small hose going into the driver's side head (it come off a tee by the radiator) and blowing in the coolant reservoir? Keep blowing until water comes out. I had to do this a week ago after a t-stat change that was causing overheating
Racer
Joined: Sep 2005
Posts: 279
Likes: 1
From: montrose colorado
The LS2 cooling system is the hardest I have ever had to get the air out. I used a minivac hand vac pump and hooked it to the small hose comming form the head to the tank and pulled a vac on it until water came out, I could actually add coolant/water to the tank as I was pulling a vac on the engine. Was able to get all the water that drained out of the rad back in, worked great.
Hay, I see you are from Sioux Falls, SD, I will be there in about 12 days for the BHCC. Are you attending??
Later
Donald
Last edited by DONALD HALL; Jul 2, 2010 at 10:22 PM.
Former Vendor
Joined: Jan 2000
Posts: 5,593
Likes: 631
From: Brighton
Yeah I have one, and your not going to like it. It's possible to ballon the flat cooling tubes if you see pressures 50 psi or higher. This would make the tubes expand and crush the fin so no air could get through the core. It could be a pressure cap or stat malfunction or a blown head gasket.
It's hard to see the effects of this so I'll post both a good fin and a crushed fin. Another way to tell is to drop a piece of paper in front of the core and see if you have any pull.
It's hard to see the effects of this so I'll post both a good fin and a crushed fin. Another way to tell is to drop a piece of paper in front of the core and see if you have any pull.
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Pull the driver's side head coolant line and purge the system by blowing into the tank. Blow until you get water out the line, put the line back on, then top off.
I had the same problem after replacing a thermostat, it's amazing how quickly it overheated due to air in the system.
I had the same problem after replacing a thermostat, it's amazing how quickly it overheated due to air in the system.
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Thread Starter
Race Director
Joined: Dec 2000
Posts: 14,697
Likes: 584
From: Sioux Falls SD
Pull the driver's side head coolant line and purge the system by blowing into the tank. Blow until you get water out the line, put the line back on, then top off.
I had the same problem after replacing a thermostat, it's amazing how quickly it overheated due to air in the system.
I had the same problem after replacing a thermostat, it's amazing how quickly it overheated due to air in the system.
where do i blow into the tank? also do i have the cap off during this??
Tdewit that is really hard to see the difference in the 2 pics besides a few bent fins on the radiator. so you are saying with the car running before the fans turn on a piece of paper should stick to the rad?
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 25
From: Austin Texas
You had an overheating problem, then replaced the water pump and thermostat but still the same overheating problem? Could it be that the "problem" was/is just a faulty sensor or gauge?
Or; Since you have no water flow thru the hose maybe your replacement thermostat is not opening?
Or; Since you have no water flow thru the hose maybe your replacement thermostat is not opening?
Former Vendor
Joined: Jan 2000
Posts: 5,593
Likes: 631
From: Brighton
You don't always have mixed oil & water with a bad head gasket or a cracked/warped head. Sometimes a connection between the cylinder and the coolant can happen without involving the oil. This might happen only when you at maximum temperature when pushing it hard.
Thread Starter
Race Director
Joined: Dec 2000
Posts: 14,697
Likes: 584
From: Sioux Falls SD
temps are getting to 210 or so sitting in the garage after around 2 minutes running.
fans ran on high speed but are not bringing the temp down.
i tested out both old and new thermostat and they both opened up fine when up to temp by dropping them into hot water
can only go in onw way and there is an alignment tab
fans ran on high speed but are not bringing the temp down.
You had an overheating problem, then replaced the water pump and thermostat but still the same overheating problem? Could it be that the "problem" was/is just a faulty sensor or gauge?
Or; Since you have no water flow thru the hose maybe your replacement thermostat is not opening?
Or; Since you have no water flow thru the hose maybe your replacement thermostat is not opening?
can only go in onw way and there is an alignment tab
Pro
Joined: Apr 2004
Posts: 559
Likes: 43
From: Bonita Springs FL
Thread Starter
Race Director
Joined: Dec 2000
Posts: 14,697
Likes: 584
From: Sioux Falls SD
250-260 when i was on the road course and it was purging fluid at a track day.
it has been to the track 4 days previous to this with the new radiator and now issues so something has gone bad it seems.
it has been to the track 4 days previous to this with the new radiator and now issues so something has gone bad it seems.
Thread Starter
Race Director
Joined: Dec 2000
Posts: 14,697
Likes: 584
From: Sioux Falls SD
tom just checked out the fins and they all look fine, i guess compression test is next.
dkal all is good down low for no obstructions etc..
going to try 1 more flush and without thermostat to see what i can find.
dkal all is good down low for no obstructions etc..
going to try 1 more flush and without thermostat to see what i can find.