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About 2 wks ago I noticed my truck trying to run warm when I was at idle. Once home I popped the hood and looked at the radiator. It had white dried on top around the cap and I had noticed a slight hissing sound when ever I walked by the truck after driving it. To me it seems obvious my cap is wore out and I need to replace it. I was low on coolant and after topping off, it has ran cool again. Of course, it still hisses when I get out after driving it. Is my logic here correct. Should I just throw a new cap on ? Thanks
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