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Old 01-02-2009, 10:20 AM   #11
JKmotorsports
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Quote:
Originally Posted by mrlee727 View Post
.... The temp is jumping from hot (240 -260) back down (100-150) and than back up and than quickly back down....
That could be an air pocket in the cooling system. Burp and refill the system to make sure there's no trapped air. Another possibility is a faulty gauge or sending unit.
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Old 01-02-2009, 10:40 AM   #12
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Well just to through another bad thing into the mix. But there is a TSB #06-06-01-019b dated June 12 2007(Gradual coolant loss over time no leaks visable) I know about on 04-06 4.8 and 5.3 that the clylinder heads crack/Porosity depending on the casting manufactor.

John
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Old 01-02-2009, 04:28 PM   #13
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The easiest way is to preform a coolant system pressure test on a cold and hot engine. This will almost definitely determine where your, if any, leak is.

If there are no leaks found during the pressure test, then I would say that the problem is now electrical/mechanical.

Get the pressure test done then try back here.
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Old 01-02-2009, 05:57 PM   #14
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I will have to agree with Sepiroth, before doing anything else, go to a shop and have the cooling system pressure tested. As someone in the automotive cooling industry this would be your first step before going any further and getting all worked up about what it could be.

I just found my 06 leaking coolant under the hood at the plastic fitting on the heater core extension for the rear heat. Found a small puddle on the floor wheile lifting it up to change the oil.

John
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Old 01-02-2009, 10:50 PM   #15
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Quote:
Originally Posted by tybardy View Post
hey metro... arent you a "Nissan Technician in the House!"??

Now i know you dont work on Chevys but an overheating problem is an overheating problem and it is almost always the same problem no matter what kind of car/truck you are driving... figure a nissan tech (or any tech for that matter) would be able to chime in with something a little better than "I thought I read somewhere that it could be a headgasket?"

because an overheating problem could always posibly be a blown headgasket... just hope for this dudes sake that it isnt the head gasket, that is never an easy fix. A good 8-10 hard hours if you do the work yourself and you had better have the right tools (quality torque wrench neccessary)
Dude! I meant it in a sarcastic way...
BTW, I didn't want to say "It's a headgasket." cause then one of you Chevy guys would say "How would you know? You're a Nissan Tech."
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Old 01-06-2009, 08:28 PM   #16
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My buddy who has a shop told me that I need to get the orange dextron crap out of my engine and replace it. Apparently it contributes to head gasket failures and there's even a class action law suit against GM because some Buick model blows headgaskets due to the dextron.
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