Radiator overheating already

[thotfulspot]

Originally Posted by sqrlnts

Installed new 16lb cap, sealing surface is good to go. I am going to install a bigger overflow tank tonight. I did notice this. After driving home from work (temp did not exceed 195) I parked the truck, and checked the overflow. It was dry, i left it that way.

After dinner I fired it up to record the exhaust for Dubie. I noticed a few small drops of moisture exiting both exhaust turn downs. I covered the exhaust with my hand and found it was getting ever so slightly wet, didn't feel like oil but also didn't smell much like coolant. After letting the truck warm up it seemed to disappear. No smoke noticed.

This makes me wonder if both heads have some sort of small crack. The head casting numbers are 462624, which are known to crack.

Is it time to do a leak down check?

Most likely condensation in the exhaust. It's common on a lot of vehicles before the exhaust system comes up to temperature. I wouldn't worry about it. A lot of it has to do with the humidity outside. My BMW and Land Rover both do it.
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[sqrlnts]

Originally Posted by thotfulspot

Most likely condensation in the exhaust. It's common on a lot of vehicles before the exhaust system comes up to temperature. I wouldn't worry about it. A lot of it has to do with the humidity outside. My BMW and Land Rover both do it.
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Best news I heard all day, thanks! Installed the new 1 gallon overflow. Filled her up and gave it a whirl. I have the adjustable fan speed controller set high to get the engine up to 210 just to test the system out tonight. So far so good but lets see what tomorrows drive to work and back brings.

Thanks again to everyone.

[robroller]

Unfortunately it is not common in a state with sub 20 % for humidity. I would check that the system was properly "burped" for air, the ensure the blades of the cooling fan are pulling air across the radiator if behind it or pushing if in front..If those are good to go I would be concerned that it is running way to lean, your timing may be incorrect, or leaking head gasket which is pressurizing your cooling system.

[thotfulspot]

Originally Posted by robroller

Unfortunately it is not common in a state with sub 20 % for humidity. I would check that the system was properly "burped" for air, the ensure the blades of the cooling fan are pulling air across the radiator if behind it or pushing if in front..If those are good to go I would be concerned that it is running way to lean, your timing may be incorrect, or leaking head gasket which is pressurizing your cooling system.

I lived in Salt Lake City and spent a lot of time in Moab. Even with the low humidity in those place I've seen it happen to my Rover and Jeep. It depends on the path of the exhaust on it's way out. Unless you are dumping the exhaust straight out of the headers it would be difficult for moisture to reach the tailpipe from the motor.

I agree there might still be air in the system and it's always worth trying to burp it. With it running as hot as it was it could be a head gasket. I just wouldn't expect to see both sides leaking at the same time and just see it at startup.
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[G&R's57GMC]

Originally Posted by thotfulspot

Most likely condensation in the exhaust. It's common on a lot of vehicles before the exhaust system comes up to temperature. I wouldn't worry about it. A lot of it has to do with the humidity outside. My BMW and Land Rover both do it.
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FACT : Water is a byproduct of combustion.

You will see it until the exhaust system is warmed up.

[sqrlnts]

Originally Posted by OrrieG

Wait till the bill for the hazardous material clean up arrives....

Originally Posted by Highsider

He should use Engine Ice, from SUMMIT. Non-toxic so he could argue the bill (if he ends up with one).

That would be so like my workplace. Two weeks ago I got a speeding ticket in the parking lot for going 21 in a 15. Hey if I get a bill at least the next time I take a dump I will have something to wipe with!