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need advise overheating


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I was driving to work today and the truck overheated. I let it cool down and checked everything and the ...




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Old 01-12-2009, 01:53 PM
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need advise overheating

I was driving to work today and the truck overheated. I let it cool down and checked everything and the radiator was pretty much empty. I just had the oil changed 2 months ago and the radiator coolant was fine. I keep an eye on my fluids regulary and it has been fine. It sat for the entire month of December in garage with no visible leaks. So I filled the radiator up with water to get it to the dealer. They just called and advised they can not get it to overheat. I replied that because I put water in it. There has to be an issue because all the coolant doesn't just vanish does it. Could it may be a head gasket. I only have 26k miles on it with no issues till now. What should I watch for from the stealership. Thanks

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Old 01-12-2009, 02:04 PM
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thermostat stuck?
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Old 01-12-2009, 02:04 PM
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Quote:
Originally Posted by badmood
I was driving to work today and the truck overheated. I let it cool down and checked everything and the radiator was pretty much empty. I just had the oil changed 2 months ago and the radiator coolant was fine. I keep an eye on my fluids regulary and it has been fine. It sat for the entire month of December in garage with no visible leaks. So I filled the radiator up with water to get it to the dealer. They just called and advised they can not get it to overheat. I replied that because I put water in it. There has to be an issue because all the coolant doesn't just vanish does it. Could it may be a head gasket. I only have 26k miles on it with no issues till now. What should I watch for from the stealership. Thanks
Ask them to test for a head gasket leak.
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Old 01-12-2009, 02:25 PM
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At normal operating temp feel the upper rad hose and the lower rad hose. If the temps feel about the same your thermostat is good.

Immediately after this shut down the engine and take out all the spark plugs. Do a compression test on all cylinders. If you have a blown head gasket where the coolant is being burned in the cylinder then you would find a higher cylinder pressure reading in one or more cylinders where the head gasket would be leaking from.

Ideally you should have the same pressure readings in all cylinders within 15 PSI of each other. If you get 30 psi difference between cylinders then your rings or valve stem seals might have issues. If you have one or more cylinders that have 20 PSI over the highest normal reading then you would most likely have a blown head gasket between the coolant and cylinder part of the head gasket.

Also you can verify a blown head gasket by seeing little bubbles in the radiator with the radiator cap off.
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Old 01-12-2009, 02:34 PM
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Also a lot of the times the water pump propeller gets rusted causing a lack of circulation in the cooling system. Our trucks use a waterpump that has a plastic propeller.

Viper Engine
The viper engine waterpump is on the left as you look at the pic.

BTW also check the waterpump ball valve to make sure you don't see any water residue from bad waterpump bearing that will leak during normal operating temps. You can also check the bearings by seeing if there is any play by wiggling the fan blades.
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Old 01-12-2009, 02:37 PM
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Here is a view of how close the coolant passages are to the cylinder:

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Old 01-12-2009, 02:53 PM
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if you have a head leak check you oil for water or coolant and check the level.
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Old 01-12-2009, 02:56 PM
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I love this web site it has to be the best car(truck) forum out there. Thanks for the response. I will keep an eye on the dealer to make sure they are checking these things.
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Old 01-12-2009, 02:58 PM
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Thank god for my extended warranty I hope.
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Old 01-12-2009, 02:59 PM
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Quote:
Originally Posted by DevilDawg3097
if you have a head leak check you oil for water or coolant and check the level.
Yes that is another thing a blown head gasket could do but it would not cause your engine to overheat. Your engine would most likely spin a rod or main if you had water in the oil.
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