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Discussion Starter · #1 · (Edited)
I'm having cooling system problem. For a while I could hear a slight thumping sound when the coolant starts circulating. Like It's trying to pump. The other night, my truck was running really hot and the cooling system never kicked in. What could be the problem. I've heard that a faulty radiator cap can cause the thermostat to stay shut. Any ideas?
 
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