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Overheating Troubleshooting

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Old 03-21-2008, 11:21 PM   #1
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Default Overheating Troubleshooting

Guys, This is my first post, and I appoligize for it being a question, but man I'm getting myself pretty much in a fuss here.

I purchased a '01 z28 a few days ago.

The car ran good for an hour or so then the Check engine light came on. Turns out that both cats are clogged (What Autozones code read said). Shortly there after the car started over heating pretty badly. The temp will usually hover around 210 for a few minutes, and then it'll spike up to redline at which point I have to shut the car off let it cool and limp it to somewhere. I have not driving it much since the over heating issue.

I replaced the thermostat thinking that its not opening once the car heats up. No change.

i replaced the Coolant Temp gauge on the #1 cylinder, again no change.

I replaced the water pump and once again, no change.

While I was changing the water pump I took a water hose to the Radiator and put water into the cap, plugged off both the upper and lower hoses and had good water flow through both ends of the radiator.

As the car overheats, eventually I lose hot air coming outa the heater core. So I assume theres a fluid flow problem somewhere. Also when I changed out the Coolant temperature, the copper end that goes into the block was dry, normal?

What would be the next step for figuring out the problem. From what I can tell none of the hoses are kinked or blocked. The radiator is having good flow. I would think the Cats could be causing the overheat, but I dont see how it would cause the lack of hot fluid to the heater core.

I notice no leaking of coolant anywhere, nor steam spray.
Please help!
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Old 03-21-2008, 11:27 PM   #2
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ive seen those symptoms on cars that have low coolant. sounds dumb, but have you ever checked the level?
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Old 03-21-2008, 11:32 PM   #3
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Take off both heater hoses and run some water through it. See if theres anything clogging it up.
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Old 03-21-2008, 11:34 PM   #4
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Yes I have coolant... I know that question had to get asked

And I took both hoses off and water flows well through the radiator.

I've heard some issues about air bubbles? Thats certainly possible I supppose, but how would I diagnose that and how would I get them out. and is it really common? or one of those off the wall possibilities
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Old 03-21-2008, 11:43 PM   #5
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Drain it, buy some Super Cleaner (NOT SUPER FLUSH!) from Zerex, found at your local Advance, and then try it. Sounds like you might have deposits.
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Old 03-21-2008, 11:45 PM   #6
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Not entirely sure here, but can't clogged cats cause overheating or other serious problems? Personally, i'd replace them or get rid of them if possible.
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Old 03-21-2008, 11:48 PM   #7
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Clogged cats result in backpressure. I didn't think of this but that might be why you're running hot. Go ahead and get a test pipe for now and see where you're at...
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Old 03-21-2008, 11:52 PM   #8
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well my first attempt is going to be to bleed the coolant lines of air.. that sounds feasible I think, as I can't think of any other reason to have the pump all of a sudden apparently not pumping water.

If I wanted to do this how should I. If I've got a massive air bubble in the radiator or intake line to the water pump.. First question I guess is whats the diretion of flow, does it go through the thermostat first then through the engine, then through the pump back to the radiator?

Should I drain the radiator completely, then pull off the Upper hose and fill via that way? Should I fill it the rest of the way through the radiator cap then?
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Old 03-22-2008, 12:06 AM   #9
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Quote:
Originally Posted by avengre View Post
well my first attempt is going to be to bleed the coolant lines of air.. that sounds feasible I think, as I can't think of any other reason to have the pump all of a sudden apparently not pumping water.

If I wanted to do this how should I. If I've got a massive air bubble in the radiator or intake line to the water pump.. First question I guess is whats the diretion of flow, does it go through the thermostat first then through the engine, then through the pump back to the radiator?

Should I drain the radiator completely, then pull off the Upper hose and fill via that way? Should I fill it the rest of the way through the radiator cap then?
After the car gets cool, take off the cap and turn the car on and let it run. You'll see it start overflowing. Don't worry bout it, just make sure you have enough coolant in there and add as much as needed. Watch the temp too. It will eventually start flowing out decently smoothly and then you can close it. And then have a spirited drive down the street.
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Old 03-22-2008, 12:54 AM   #10
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What are the fans doing meanwhile?
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Old 03-22-2008, 01:10 AM   #11
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What kind of driving are you doing when its overheating? does it still have the air deflector under the nose of the car?
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Old 03-22-2008, 08:37 AM   #12
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Here is one to try. Clean the front outside of the radiator. You could have dirt, newspaper, plastic bags, bugs, birds, leaves, honda civics, mustangs and all kinds of other **** clogging the air flow through the radiator.
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Old 03-24-2008, 09:31 AM   #13
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Well just to end this thread for anyone who uses the search feature. It turned out I had air bubbles in the coolant system. I ran the car w/o the coolant cap on for awhile. Let it cool down, then re added fluid. Made sure the heater was on full while I was doing it and walla. Problem solved. Thanks guys
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Old 03-24-2008, 03:31 PM   #14
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Glad to hear you solved the problem man..and also it's great that you came back and updated it.Not many people do that and you end up getting tons of posts with no answers when you do a search!

Good job man!
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Old 03-25-2008, 09:17 AM   #15
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Quote:
Originally Posted by KENS_SS_4 View Post
Here is one to try. Clean the front outside of the radiator. You could have dirt, newspaper, plastic bags, bugs, birds, leaves, honda civics, mustangs and all kinds of other **** clogging the air flow through the radiator.
LOL you clown!
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Old 06-12-2008, 11:35 AM   #16
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Quote:
Originally Posted by avengre View Post
Guys, This is my first post, and I appoligize for it being a question, but man I'm getting myself pretty much in a fuss here.

I purchased a '01 z28 a few days ago.

The car ran good for an hour or so then the Check engine light came on. Turns out that both cats are clogged (What Autozones code read said). Shortly there after the car started over heating pretty badly. The temp will usually hover around 210 for a few minutes, and then it'll spike up to redline at which point I have to shut the car off let it cool and limp it to somewhere. I have not driving it much since the over heating issue.

I replaced the thermostat thinking that its not opening once the car heats up. No change.

i replaced the Coolant Temp gauge on the #1 cylinder, again no change.

I replaced the water pump and once again, no change.

While I was changing the water pump I took a water hose to the Radiator and put water into the cap, plugged off both the upper and lower hoses and had good water flow through both ends of the radiator.

As the car overheats, eventually I lose hot air coming outa the heater core. So I assume theres a fluid flow problem somewhere. Also when I changed out the Coolant temperature, the copper end that goes into the block was dry, normal?

What would be the next step for figuring out the problem. From what I can tell none of the hoses are kinked or blocked. The radiator is having good flow. I would think the Cats could be causing the overheat, but I dont see how it would cause the lack of hot fluid to the heater core.

I notice no leaking of coolant anywhere, nor steam spray.
Please help!

Having similar problems,reading threads suggested tune up, or possible cat maybe clogged. I will attempt to get air out of system. As long as I am moving 55+ it all good but if I stop at a light temperature is rising fast.
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Old 06-12-2008, 11:35 AM
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