I have a 2002 duramax with a diablo programmer on it and I'm loosing water I checked the oil and it's ok but she is blowing alot of white out the tail pipe she has tons of power,never overheats and the low coolant light comes on I put 1/2 gallon of water in every 3 or 4 hours thought head gasket but my oil would b trash if it was that right?

 

It could be head gasket or leaking injector cups. Does the radiator hose stay hard over night is your coolant discolored?

 

Hose is never hard even after I've been working for 3 or 4 hours there is no pressure in the coolant tank top hose is still easy to squeeze.

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The coolant tank don't hiss when I open it it's like it's he engine has been sitting all night, after she's been running several hours and temp is showing 160 degrees

 

Can you see coolant running down the side of the block somewhere? It doesn't sound like a cup leaking, but you can let the truck sit overnight and pull the glow plugs to see if coolant is on the glow plugs. The white smoke has me concerened its leaning towards a hg but not a 100% sure

 

I figured hg would contaminat my oil

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Not diesel inclined never worked on one before

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Didn't see coolant running down block but did have some pooling off passenger side inside fender

 

The passenger side fender means its puking out the coolant reservoir, the glow plugs are on the side of the block just below the valve cover. They have a wire on then held down by a 8mm nut, the glow plug u will need a deep 14mm to remove it.

 

Not much but some was there. Couldn't figure why it was there cause system isn't building pressure I'll pull one of the glow plugs in the AM and look or I guess I need to check all of them huh. Since I don't know which one might b leaking

 

Yup all if them.

 

K my mechanic seems to think head gasket so I guess since we r in the area new injectors are a good idea what do u think stock or 50+ on the injectors they aren't bad I don't think but it would b good insurance to do it now I think.

 

The injectors have a sleeve they sit inside of, and its pressed in and sealed with loctite. Sometimes they can come loose.