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Discussion Starter · #1 ·
My son was driving our 2010 impala police with a 3.9 last night when the car ran hot. He pulled off the road and we had the car towed home. I ran the car around the neighborhood this morning and the temp stayed normal. I opened the hood and on the top of the radiator on the far left hand side there is a nipple that looks like it should have a small hose hooked to it that is dribbling water out of it. Should a hose be hooked up to this nipple or what? Any help would be appreciated. Have never had a overheating problem before on this car.
 

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My son was driving our 2010 impala police with a 3.9 last night when the car ran hot. He pulled off the road and we had the car towed home. I ran the car around the neighborhood this morning and the temp stayed normal. I opened the hood and on the top of the radiator on the far left hand side there is a nipple that looks like it should have a small hose hooked to it that is dribbling water out of it. Should a hose be hooked up to this nipple or what? Any help would be appreciated. Have never had a overheating problem before on this car.
The attached pic shows what I found on my 2007 SS. Not sure how close these cars are. They're both gen8's, but with the different motors and years, they may be quite different.

Anyway, on mine, there's a hose between the water pump and that nipple you found.

HTH.

Doug

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Discussion Starter · #4 ·
Thanks, I looked at mine and it is different. I do not see any hoses disconnected but something has to go there. If anyone has a 3.9 could you please look and tell me what goes there? There is no way the radiator could be pressurized with nothing connected there.
 

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Did you check the coolant level?

If you check your coolant level when the engine is cold, the coolant should be at or above the "minimum" or "fill" line on the transparent refill container. If you check your coolant level when the engine is hot, the coolant should be at or just below the "max" line.
 

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Discussion Starter · #7 ·
Recovery tank hose goes to just under the radiator cap. I checked to see if there was another hose coming off the recovery tank and there is not. There had to be something there,we drove the car almost daily and never had a problem with it overheating.
 

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I am going to take a guess at this and again this only a guess....

One with the POL type of car it was setup different the other Impalas, One of the things they did do was use a Higher Flow Rad like a SS V8 one. So the reason I am going to guess is because there may have been a problem with the OEM that was on the car and when they tried to find one they could only come up with the SS one for the Flow Demands... With the Over Flow being different it could be that they had that capped off. Then because of what ever reason, It pressured over what the connection could take and what ever was there has flown off and lost.

I would cap it off. Fill the system and check for leaks. Keep an eye on the cars temps and see if it starts to get to hot again. Could be a Bad water pump, Thermostat or just a fluke one time issue. IF after you fill it up and do the warm up purge for these cars. I would keep an eye for leaks or heat issue.

Let us know what you find out...

James
 

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Discussion Starter · #9 ·
You know I was wondering what would happen if I just capped it off? I have looked everywhere for a cooling line not hook and can not find any. It seems like it would be it would be pretty obvious. Going to do as you suggest and see what happens. I really don't see how it could hurt anything. What is the purge procedure?
 

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You know I was wondering what would happen if I just capped it off? I have looked everywhere for a cooling line not hook and can not find any. It seems like it would be it would be pretty obvious. Going to do as you suggest and see what happens. I really don't see how it could hurt anything. What is the purge procedure?


Before I capped the line - I would go to a Chevrolet dealer part's department with the car's VIN. Tell the part's employee your problem and ask to see a blow-up of the parts for the cooling system. A friendly employee can also print a picture of the computer blow-up illustration. You may need to buy / order a new part (such as the line) but the diagram will show you exactly what should be connect to the line and where it goes.
 

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Yeah I looked up the Radiator for a 2010 Impala Police, and it does have that connector on it as pictured.... I am not sure what it goes to as I can't find anything that says what it goes to. Looking over the other ones on a 2010 it has a different radiator all together. I would talk with GM and see if they can give you a parts list for the setup.

I do however think it was a carry over design from older year like the SS and that it isn't used in the 2010 in my own thoughts. Seeing it was a bigger motor needs higher output demands. Also seeing there don't seem to be any random laying around hoses.

But asking Chevy would confirm what is needed for your cars setup.. Please be sure to let us know what you find out..

James

Also to burp or purge your system. I would fill the car, run it with the heater on so the water can flow into the core and add water. let it warm up and once the thermostat opens and water rushes fill some more in the top cap area. Once filled keep an eye on your temp levels... To answer your last question..
 

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Discussion Starter · #12 ·
Mystery has been solved! After doing some more searching on line my son found a picture with the part listed. It should have a 1"-2" what they call a vent cap on it held on with a clamp. It is only on 9c1 and 9c3 impalas. AC delco part # is RC112. They think a lot of it though ,it runs about $20. Don't know what happened to the one that was on there. Just happy to finally find the problem. This little piece of rubber cost me $65 for a tow,around $20 for the part and another $12 in coolant. That is ok though at least my son knew to pull off the road at the first sign he noticed of the engine overheating. It could have cost me a engine. Thank You so much to everyone who responded for your help.
 

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Thank you for the Picture, I have seen a few of these cars over time and they have looked like something capped off. Seeing they were not there for motor repair I just let it be. as I thought maybe the owner capped it off themselves. Seeing I was in the Mobile Electronic business. Now with the picture I know they were meant to be like that now. In case there is another time I need to work on them cars...

Wonder why there was so much pressure that it made it come off to start with. Have you looked over your system for the smell of Exhaust in your system or fluid in your oil?

In the end I hope it was just a case of failed hose clamp.

James
 

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Discussion Starter · #16 ·
Thank you for the Picture, I have seen a few of these cars over time and they have looked like something capped off. Seeing they were not there for motor repair I just let it be. as I thought maybe the owner capped it off themselves. Seeing I was in the Mobile Electronic business. Now with the picture I know they were meant to be like that now. In case there is another time I need to work on them cars...

Wonder why there was so much pressure that it made it come off to start with. Have you looked over your system for the smell of Exhaust in your system or fluid in your oil?

In the end I hope it was just a case of failed hose clamp.

James
I checked the oil and it looks good. When I had the radiator cap off the coolant was not churning like a blown head gasket would. Once I get the part I am going to keep the car close to home for awhile to make sure there are no other issues. I went to oreilly, autozone and napa this morning and none of them carry this part. Going to the dealer tomorrow to get it.
 

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Awesome, I am glad things sounds like going to work out... I think it maybe a left over design from other years... Seeing the SS hasn't been made since 09 and they had it going to overflow... High Flow, not broke don't fix it kind of thing I guess... Some parts only Dealer carry. Hope they have them in stock and don't have to order it in from Manufacture.

Thanks for the update.

James
 

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I've had my thermostat and water pump changed because they had seized, and my temperature guage was going up. I'm wondering if one of them could be bad on your car too?
 
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