00 C5 Overheating
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Joined: Apr 2007
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From: Montgomery Alabama
00 C5 Overheating
I have a 2000 model C5 that was running great, low temperatures and all. I stopped at a gas station earlier today and let it idle for about 5 minutes while I was talking. Next thing I know smoke is coming out of the right side of the hood. I turn the engine off and pop the hood and it appears the hose connecting the overflow tank to the block came off at the tank end. I placed the hose back on the tank and filled it up with Dexcool antifreeze and it was still overheating. At idle, the temperature was lower. As I started accelerating though, it appeared as if the coolant gauge just kept rising and rising until it displayed on the DIC. My question is what could have caused the hose to come off and why is it still running hot after I reconnected it and filled it back up with antifreeze?
Instructor
Joined: Oct 2010
Posts: 240
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From: Yangpyeong Gyeonggi-Do
Burp the system.
Try this .....
http://www.zr1specialist.com/HAT%20W...%20Coolant.pdf
Could have just been a loose clamp....check the condition of the hoses.
Also check cap on the tank
Try this .....
http://www.zr1specialist.com/HAT%20W...%20Coolant.pdf
Could have just been a loose clamp....check the condition of the hoses.
Also check cap on the tank
Last edited by seoulbrooks; Dec 23, 2010 at 04:53 AM.
Tech Contributor
Joined: Dec 2006
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From: Van Buren Arkansas
Wounded Warrior Escort '11
Yeah, tend to agree with the air in the system thoughts. The tank is part of the pressurized system. Once you are sure there is no air in the cooling system if it still happens then there are larger issues on the horizon such as a head gasket issue and so on. Lets hope things don't go there.
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Joined: Apr 2007
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From: Montgomery Alabama
i appreciate all of the responses, guys! Ill get out there and trying burping the system in the morning. I sure hope this is a simple issue and not something like a head gasket, etc. I just bought the car a couple weeks ago, and its already doing this.
Le Mans Master
Joined: Feb 2002
Posts: 6,937
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From: Waldorf MD
How to check tank for leaks
As said, the radiator fill tank (plastic) often develops a small crack (sometimes you can't even see it) in the small connection on the top of it.
My 1998 C5 with 130,000 miles just did. I noticed a red residue (dried antifreeze) on the top of the ridge along the edge of the tank.
I tried to seal it (with waterproof epoxy), but it did not hold. A new tank is about $80.
My 1998 C5 with 130,000 miles just did. I noticed a red residue (dried antifreeze) on the top of the ridge along the edge of the tank.
I tried to seal it (with waterproof epoxy), but it did not hold. A new tank is about $80.
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From: Montgomery Alabama
Since i've been sick I haven't been able to mess with it but today I was determined. I pulled the hose to the side and it appeared to have an unusual bulge, so I took a pair of pliars and pried out what was lodged. It looks like the nipple of the tank broke off and was somehow stuck in the hose, blocking the flow. Here's a picture.
It also looks like someone tried using some epoxy to seal the top as well. So I'm guessing a new coolant tank is in order?
It also looks like someone tried using some epoxy to seal the top as well. So I'm guessing a new coolant tank is in order?
Last edited by unkn0wndj; Dec 29, 2010 at 10:47 AM.
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Thread Starter
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Joined: Apr 2007
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From: Montgomery Alabama
Installed the coolant tank today and it seems to be fixed. Highway temps average around 195-200 and idle is around 205. It's still pretty chilly outside, but it's alot better than 260; hah! Those temps are about average, right?
Tech Contributor
Joined: Dec 2006
Posts: 10,962
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From: Van Buren Arkansas
Wounded Warrior Escort '11
They use to be about $50 but I see from the link to Gene's site, they've gone up. But still a decent price. No, you do not need to order a low coolant sensor for the tank too as it comes with it or at least, they did!
Race Director
Joined: Mar 2008
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From: Rio Rancho NM
Heat and time take their toll on plastic components. Item 5 in the link below is what you need and Gene Culley's GM Parts House (link) will likely have the best price.
http://www.gmpartshouseusa.com/partl...layCatalogid=0
http://www.gmpartshouseusa.com/partl...layCatalogid=0
Thread Starter
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Joined: Apr 2007
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From: Montgomery Alabama
I bought mine from eBay and it was the original ACDelco part for $66 shipped (Dealer wanted $101 plus tax); This is it, http://cgi.ebay.com/ebaymotors/ws/eB...m=270631497911
Pro
Joined: Aug 2010
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From: San Antonio Texas
While you are on the subject you might want to take a really good look under the front of your car. I did this last night and was AMAZED at how much junk was lodged up underneath and in front of the radiator!!!! I pulled out three large handfuls of pine needles, twigs, a plastic bag and part of a paper cup. I had no indication of overheating or any other issue. Just a suggestion!
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Joined: Apr 2007
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From: Montgomery Alabama
While you are on the subject you might want to take a really good look under the front of your car. I did this last night and was AMAZED at how much junk was lodged up underneath and in front of the radiator!!!! I pulled out three large handfuls of pine needles, twigs, a plastic bag and part of a paper cup. I had no indication of overheating or any other issue. Just a suggestion!
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Joined: Apr 2007
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From: Montgomery Alabama
Another issue that I'm having is a slightly rough idle. The car runs and cruises great, but when you're idling it feels as though it's a very slight misfire. Not enough to make the RPMs jump or anything but it is noticeable. Any suggestions?
Tech Contributor
Joined: Dec 2006
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From: Van Buren Arkansas
Wounded Warrior Escort '11
Pull your codes and post them please. You could simply have a bad plug wire(s) or the connection tube from the PCV valve to the intake. Check the airbridge to insure its not allowing unmetered air to get past the MAF.
Seriously though, you should start a new thread as others more qualified to assist you, may not look at this thread due to the overheating title.
Seriously though, you should start a new thread as others more qualified to assist you, may not look at this thread due to the overheating title.
