Skip the auto shop - Our mechanics make house calls

Q: How do you keep an engine from cracking in cold weather without a radiator?

asked by on

While replacing my radiator i twisted the lower transmission cooler line. Its suppose snow tonight so how can I keep from cracking my engine block? not below freezing at least i dont think.

My car has 200000 miles.
My car has an automatic transmission.

Hi there. The best thing to do is remove the radiator cap to the radiator and try to untwist the lower radiator hose if you can. If you cannot untwist the hose and the coolant is full or if there is water in the engine and not coolant, then as long as the radiator cap is off then if the coolant or water was to freeze, then the water will come out of the radiator and not crack the block. Coolant with a full strength will hold up to (-75 F degrees). If there is water in the engine, I recommend draining some of the coolant to keep the engine freeze plugs from coming out overnight. Freeze plugs (casting or core plugs) are designed to come out in the event of the coolant or water freezing in the engine block preventing the block or heads from cracking as the water turns into ice. If you need further assistance with your cooling system, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  • Home
  • Questions
  • How do you keep an engine from cracking in cold weather without a radiator?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Vehicle is getting hot after 10 minutes of driving.

If you are referring to the metal radiator pressure cap, leaving that cap off will cause coolant loss and overheating. Leaving the plastic cap off of the plastic overflow reservoir may cause coolant loss if the overflow pick-up tube is...

Q: Throttle Body needs replacing, is cardone re-manufactured 'better' than a 'new' throttle body

When it comes to remanufactured or brand new you are better off in most cases with the new one. The reason the company did not have the remanufactured one in stock is due to there has not been enough old...

Q: Motor making strange knocking sound.

Hello, you may have something in the motor that is broken but a common knocking noise with this car is from the torque converter flex plate. A technician, such one from YourMechanic, can listen to the sound to determine where...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.