HELP!! Overheating Question.
Thread Starter
Burning Brakes
Joined: Feb 2004
Posts: 1,246
Likes: 2
From: McKinney TX
HELP!! Overheating Question.
Car had been occasionally overheating, but nothing severe. Today, decided to replace thermostat to see if that could be the problem. Now, it overheats immediately? Never acted like this before. Obviously, it could be a more severe problem like a water pump, BUT, it never did this before with the old t-stat...just random over heating. Now it happens no matter what. What could it be now? Did I refill the coolant wrong?
Team Owner
Joined: Mar 1999
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From: San Jose/Bear Valley CA
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Check to see if you have circulation.... (possible bad pump) Once the cap is back on, check to see if you have pressurization... (stiff hoses) then check to see if you have debris in front of your radiator.. A big garbage bag will do the trick.. and put you in the situation you are in now...
VR
VR
Team Owner
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did you do the drain and fill correctly?? if not like stated above air may be your problem...also when is the last time you really cleaned the fins on the radiator and ac?? need to pull the shroud off to really clean them good
Le Mans Master
Joined: Aug 2005
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From: DP(oh you know where) IL
St. Jude Donor '06
Originally Posted by pewter99
did you do the drain and fill correctly?? if not like stated above air may be your problem...also when is the last time you really cleaned the fins on the radiator and ac?? need to pull the shroud off to really clean them good
100%
Drifting
Joined: Oct 2003
Posts: 1,540
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From: bloomfield nj
did you burp the coolant system?
do the cooling fans come on?
do you have heat?did you have heat prior to changing the stat?
do you have white/gray smoke out the tail pipes?
have you been topping up the coolant often lately?
do the cooling fans come on?
do you have heat?did you have heat prior to changing the stat?
do you have white/gray smoke out the tail pipes?
have you been topping up the coolant often lately?
Melting Slicks
Joined: Mar 2005
Posts: 2,252
Likes: 181
From: NE OH
Here's my understanding of what you said was going on:
A) Prior to t-stat change, occasional overheating.
B) After T-stat change, immediate overheating.
Based on the above, I'd say you didn't get the air out of the system.
As for the occasional overheating, take a look at the other suggestions relating to debris, etc.
A) Prior to t-stat change, occasional overheating.
B) After T-stat change, immediate overheating.
Based on the above, I'd say you didn't get the air out of the system.
As for the occasional overheating, take a look at the other suggestions relating to debris, etc.
Thread Starter
Burning Brakes
Joined: Feb 2004
Posts: 1,246
Likes: 2
From: McKinney TX
Okay, got air out of system. Doesnt overheat as fast. Unfortuntely, it still overheats once you put a load on it. By replacing with a new thermostat, we've made the previous problem worse. BTW, this is actually JoshVette's car... see this problem.. http://forums.corvetteforum.com/show...ht=overheating
Fans come on properly.
Air out of system.
Radiator checked.
My only thought now is water pump. But, weird that the new t-stat has magnified the problem.
Fans come on properly.
Air out of system.
Radiator checked.
My only thought now is water pump. But, weird that the new t-stat has magnified the problem.
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Drifting
Joined: Oct 2003
Posts: 1,540
Likes: 0
From: bloomfield nj
does the cooling fan[s]come on?
are you getting heat?
still sounds like you have some air possibly.
are both radiator hoses hot to the touch?
the original post stated that at highway speeds the car as fine,true?
are you getting heat?
still sounds like you have some air possibly.
are both radiator hoses hot to the touch?
the original post stated that at highway speeds the car as fine,true?
Thread Starter
Burning Brakes
Joined: Feb 2004
Posts: 1,246
Likes: 2
From: McKinney TX
Cooling fans come on. Low speed and then high speed.
Yes getting heat.
Yes hoses are hot.
Car at highway speed or any load will overheat. Moving air does not help.
Anyway to bleed air out besides squeezing hoses and working with the coolant tank cap on and off?
Yes getting heat.
Yes hoses are hot.
Car at highway speed or any load will overheat. Moving air does not help.
Anyway to bleed air out besides squeezing hoses and working with the coolant tank cap on and off?
Drifting
Joined: Oct 2003
Posts: 1,540
Likes: 0
From: bloomfield nj
does the coolant jug gurggle?
right now it's one of two things.either the impeller on the water pump is missing blades or not spinning fast enough[no circulation]or you have a combustion leak into the coolant system[that's providing you have all the air out of it].if you have a combustion leak,you should see the coolant in the jug bubbling like hell and pushing it out of the jug.if you have a circulation problem,the coolant in the jug will look like a calm lake.
when you turn the car off do you hear a knocking sound coming from the coolant sytem[knock sound from radiator,overflow jug,etc]?
right now it's one of two things.either the impeller on the water pump is missing blades or not spinning fast enough[no circulation]or you have a combustion leak into the coolant system[that's providing you have all the air out of it].if you have a combustion leak,you should see the coolant in the jug bubbling like hell and pushing it out of the jug.if you have a circulation problem,the coolant in the jug will look like a calm lake.
when you turn the car off do you hear a knocking sound coming from the coolant sytem[knock sound from radiator,overflow jug,etc]?
Thread Starter
Burning Brakes
Joined: Feb 2004
Posts: 1,246
Likes: 2
From: McKinney TX
Yeah its pushing it... we just took off the radiator shroud and went right into the main hose...big ol air gap...poored coolant mix right into there until it came out the radiator...then put the hose back on...kind of a pain...but it looks like that was it. Following the proper air bleeding procedure wasnt good enough for the killer air bubble we had I guess...
Le Mans Master
Joined: Jan 2005
Posts: 5,479
Likes: 13
From: Dallas/Grand Prairie Texas
Originally Posted by pewter99
sounds like you got it fixed 
Thanks a million Chris, I owe you another one.
That was a serious air pocket caught in there........what a hassel.
It drove home fine, it never went over 205 degrees at the stop lights.
