Your truck is losing coolant for one or more reasons including; a leak outside the engine, typically the water pump, or heater hose (should be noticable in the engine bay or on the ground), or leaking due to a failed head or head gasket (should be noticable by coolant in your engine oil- eg. white/milky oil, or noticable by thick white smoke/steam at the tail pipe especially for a short time after engine start-up.
Sounds like engine coolant getting in crankcase, could be an intake gasket going bad.
There's a good chance that coolant is getting mixed in with your oil.
One can purchase a 2013 GMC Sierra 1500 Denali truck in a number of different places. Most GMC dealerships will have one or more on the lot. As well, they can be found available for purchase on Auto Trader.
GMC have had a lot of famous vehicles during their long production history. Two notable ones are: The GMC Vandura, which was the van used by the A-Team. And secondly the GMC Sierra, which was the truck used by Walker Texas Ranger.
It's either a leak or a head gasket.
It will make your truck a lot louder, hurt fuel mileage, and make the check engine light come on and it is illegal to do this.
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There is obviously a leak in the system. Take the truck for a spin, let it warm up and then leave it running in the driveway for a few minutes. Look for a drip. If you can't find anything, then your in more trouble. Shut the truck off, and check your oil for coolant because you likely need a head gasket.
Blown head gasket or cracked block, if the vehicle is a petrol.
GMC is a popular vehicle model. They can be purchased on a GMC dealer lot, online brokers, used car lots, etc. . Many online sites can be used as well to locate GMC. Generally any car lot will have used cars that would include GMC.
Have a QUALIFIED mechanic test the coolant for exhaust gases. If it's using coolant but not leaking out, you may have a blown HG.
A pro of getting a truck would be that you can haul a lot of stuff with it. A con would be that there is not a lot of seating room in a truck.