Skip the auto shop - Our mechanics make house calls

Q: i replace radiator and now my coolant resivor starts boiling and i over heat

asked by on

I replaced radiator after trying a stop leak that was for blocks and radiator and now I still over heat and now a new problem has occurred my coolant resivori is boiling on top of overheating

My car has 230000 miles.
My car has an automatic transmission.

A: When you put in the stop leak, you may have...

When you put in the stop leak, you may have blocked some passages and the thermostat. I would remove the thermostat and the lower radiator hose, then run clean water from a hose through the engine and radiator to flush out all the stop leak.

After flushing the entire system out, then install a replacement thermostat and reinstall the lower radiator hose also. Once this is done and the system is refilled with new 50/50 coolant, then you should not overheat.

If it continues to overheat after this then you may have a blown head gasket.

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!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Air conditioner not working

Hi. It may be a compressor issue, or it could be an expansion valve that is a stuck open. A stuck open expansion valve would show a higher than normal pressure on the low side when the AC is in...

Q: Rattle when cold engine - 2006 Ford Mustang

Hello. This could be a variety of many things and may be difficult to pinpoint without physically inspecting the car. Many cars tend to have small or subtle vibrations and rattles as fasteners, nuts, and bolts become loose over time....

Q: Leaking coolant

A cooling system pressure test should be performed to show the actual area of the issue. The water pump gasket, thermostat housing gasket, coolant hoses, radiator, heater hoses, or even the greater core could be the cause of the leak....

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.