Categories FAQ

Readers ask: What would cause a freeze plug to come out?

In some cases, as the water freezes and expands in your block, the freeze plugs will push out relieving the pressure of the freezing water and partially draining your cooling system. However, freeze plugs can also start to leak over time simply due to the heating and cooling cycles of driving your car.

What would cause a freeze plug to pop out?

it depends on the engine and the place of failure. your other options are a cracked water jacket as well, small enough that you wont loose coolant through it while the car is running, but enough that the compression gasses pressurized the cooling system enough to push a freeze plug out.

What happens when your freeze plug goes out?

Freeze plugs are an essential part of your engine, because they keep coolant from leaking out. If you neglect a leaking freeze plug for too long, your engine’s coolant could potentially leak to a level where it can no longer effectively cool your engine, and cause it to overheat, risking extensive damage.

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Can you drive with a leaking freeze plug?

If you have no other option, you may be able to drive with a bad freeze plug. As long as you keep your engine coolant full and your engine never gets hot, you could limp your car along with a leaking freeze plug although we never recommend it. It’s messy and at any point could leak to your engine overheating.

What does a blown freeze plug mean?

Freeze plugs normally blow out for a reason (freezing of the coolant or overpressurization). I bet the car was sitting someplace where the coolant was really just water and not much antifreeze and it froze up and blew one plug and partially blew the other.

How do you seal a freeze plug?

Clean the surface with some brake cleaner and wipe dry. Then prep the plug with some Permatex Form-A-Gasket #1 sealant. This product is designed for freeze plugs and other press-fit applications, as well as gaskets. Just a thin coating is all you need.

Can you replace freeze plugs without removing the engine?

freeze plugs you can get to without removing suspension components or pulling the engine entirely (btw, any engine overhaul should include replacing the freeze plugs — they’re only a dollar or two …

Can you JB Weld a freeze plug?

JB weld will hold and seal a freeze plug a long time and if the surfaces were properly prepared it might outlast the engine.

Can you patch a freeze plug?

A freeze plug that needs repair will be leaking coolant, and will need to either be resealed or replaced, depending on how bad the damage is. Freeze plug replacement can be performed without hiring an auto mechanic, but requires proficiency with auto parts and the tools used with them.

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Do freeze plugs actually work?

Freeze plugs typically fail by freezing. This isn’t necessarily a bad thing, though. Freeze plugs were originally used to protect engines from cold-related damage. If the coolant inside an engine freezes, it may cause the block to crack.

How long does it take to change a freeze plug?

The entire process, depending on the exact location, can take as little as one hour to much more than eight hours if multiple parts need to be removed.

When should I replace my freeze plugs?

I’d recommend doing it every three years or 60,000 miles – given the cost of the consequences. Tom: If you don’t have good rust inhibitors, rust will attack the weakest link in the engine block. That’s the freeze plugs – which are designed to give way if the engine freezes, preventing your block from cracking.

What sealant do you use on freeze plugs?

1 Sealant. Fast-drying, hard-setting sealant designed for sealing rigid materials and flanges, or patching holes and joints where permanent assembly is desired.

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