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I haven't worked on any recent camaros (97 = recent = ahem) so break out the salt.
Depends on where the return is located. If the return hose is near the cap, water can flow out an opening. I'd leave that for now unless you suspect they reversed the pump flow.
Generally, if the engine is cold, circulation should be confined to the engine via the thermostat valve. If it's really cold and circulating through the radiator I'd be hitting the books. (headscratch)
Overheating while idling is usually an airflow problem. How does the fan shroud look? Broken? Big gap to the fan? Isn't that a mechanical fan? If so they may have used a bad clutch when they replaced the pump, or that may have been part of your original problem.
Also, what's an internal leak? Dealer shorthand for your credit card to their bank account?
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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