Rick's Free Auto Repair Advice

Posts Tagged: freeze plug

Freeze plug, core plug, expansion plug

What is a freeze plug? DIYers often refer to a core plug as a freeze plug or expansion plug, thinking that they’re designed to pop out and protect the engine if the coolant/water ever freezes. That’s a myth. That’s not why they’re installed in your engine. They may or may not pop out if your coolant freezes, but it’s just as likely that your engine is already damaged BEFORE the plug pops out. What does a core plug do if it doesn’t act as a freeze plug safety device Core … Read More

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