My 2006 Sierra 150 truck was fine at midnight, but when I went to drive it in the morning the power steering would not work. The mechanic says the damage was done by a blown "cooler", but I did not have any overheating problems going to my appointment. Only had hard steering problems.
how does a blown-up cooler damage a power steering pump?
on 2006 GMC Sierra 1500
Perhaps your truck has a oil cooler for the power steering system. The mechanic that is working on your truck should be able to clarify this for you.
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