Is your oil level low? Do you have an oil cooler going to the radiator? If there is then its possble the cooler is leaking inside the radiator.
Does the cooling system still use Dex-Cool? The S trucks are one of the models that seem to have problems with the Dex-Cool. People would usually see a dark brown mud basically in their cooling system.
If it still uses Dex-Cool then I would sugest draining and flushing the cooling system (including a good flushing of the heater core. Remove the hoses and force water through with a garden hose) and refilling with another coolant/antifreeze.
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Thanks! I'll see if my son can help me and we'll give it a try. Thanks!!
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