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  #1  
Old 08-04-2010, 06:00 PM
sawyersd sawyersd is offline
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Default '03 1500 4.7L Overheating/Engine Code P0441/P0440

I have been having problems with my truck overheating for the past two weeks. When i am idling or driving under 40 my truck overheats after a few miles, when I'm on the highway its just over halfway on temp gauge. I have replaced the fan clutch, thermostat, upper and lower radiator hoses and have had my radiator flushed. I'm running out of solutions. To top it off this P0441 code just popped up a few days ago, anyone have any ideas?
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Old 08-04-2010, 06:31 PM
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You probably have a partially clogged radiator and flushing it won't fix the problem; you'll need a new one. As for the P0441, it's been my experience that the NVLD assembly is bad but it could be a vacuum leak or purge solenoid problem.
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Old 08-27-2010, 03:15 PM
DodgieDan DodgieDan is offline
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Had the same problem, when dealer finally got around to checking and looking head gaskets were shot. This lead to the heads being warped, luckily I had purchased a warranty when I bought mine used and it covered replacing the heads and gaskets. Get the dealer to check best way is to pressurize the cooling system then pop the spark plugs and using fibre optic light and camera check for leaking into the cylinders.

This is how they located mine I was getting a constant overheat and also said it was missing on a couple of cylinders. The first tried replacing and swaping the cylinder coils but same message kept coming up. When they finally pressurized the cooling system and looked they found the head gaskets were leaking fluid into the cylinders.

It is fixed now and runs like brand new truck, mileage has gone back up to EPA rating when it was new. It also has way more power and seems to cruise with less shifting.
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Old 08-27-2010, 03:21 PM
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Without the accompanying misfire codes, a radiator restriction is most likely.
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Old 08-31-2010, 12:58 AM
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i would say put in a water pump seems to me like you dont have enough flow and the added airflow helps cool
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