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  #21  
Old May 8th, 2013, 11:33 AM
sro
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Sam Odio
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Quote:
Originally Posted by Jymmiejamz View Post
Radiator or fan clutch would be my guess.
I have noticed the fan is running even when the system is cool. According to my manual it should only engage when the air around the radiator reaches a certain temp. Also, I've tried the newspaper test and have never been able to stop the fan (even when the engine is cold).

What's the best way to test for a blocked radiator or failing waster pump?
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  #22  
Old May 8th, 2013, 11:53 AM
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Adam
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I can most assuredly say that your radiator is the issue. It may need to be replaced, recored, or just cleaned and flushed. Buy an IR thermometer and start there. They are cheap.

Just to be sure, you still have the fan shroud installed, right? And the front grille isnt completely blocked with junk like leaves/mud/etc?
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  #23  
Old May 8th, 2013, 07:04 PM
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Jimmy
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Originally Posted by leastonce View Post
fan clutch wouldn't cause system to failure to pressurize
How is he determining the pressure? By feeling the hoses? That's not very scientific.
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  #24  
Old May 8th, 2013, 10:22 PM
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Jason England
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Quote:
Originally Posted by Jymmiejamz View Post

How is he determining the pressure? By feeling the hoses? That's not very scientific.
Agreed but i can clearly determine the difference between my flaccid member and my raging stiffy by touch .. So judging that the cooling system has pressurized isn't too much of a stretch.
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  #25  
Old May 22nd, 2013, 11:53 AM
sro
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Sam Odio
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I was able the get the system to pressurize after a long highway drive. It doesn't pressurize when I drive shorter distances (even though it gets up to temperature), but I now think that's normal.

That said, I just recored the radiator. It was about 30% plugged. We'll see if that addresses the overheating issue.
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  #26  
Old May 22nd, 2013, 02:17 PM
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Chris Davis
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Hope it is all solved! 30% is significant for these trucks...
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  #27  
Old June 12th, 2013, 12:28 PM
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George
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sro - did you solve the overheat problem? I just replaced all components of my cooling system and am experiencing similar issues to yours. New radiator, hoses, sensors, thermostat and cap. Water pump only has a few thousand miles on it. The engine runs hot and the top hose remains cool and with no pressure. Not sure if I have an air lock after filling the coolant or if there is a bigger issue.

Would like to hear how it turned out for you.
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  #28  
Old June 12th, 2013, 01:02 PM
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Adam
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Sounds like you have an air lock, here is the magic bullet:


http://www.amazon.com/UView-550000-A...ystem+refiller
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  #29  
Old July 2nd, 2013, 03:42 AM
sro
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Sam Odio
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Radiator blockage was the issue for me. New larger rad solved all issues.
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  #30  
Old July 2nd, 2013, 08:40 AM
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Jimmy
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Quote:
Originally Posted by transientmechanic View Post
Sounds like you have an air lock, here is the magic bullet:


http://www.amazon.com/UView-550000-A...ystem+refiller
That is probably the most useful/time saving tool I have ever purchased.
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